• RELEVANCY SCORE 3.82

    DB:3.82:Get The Class And Methods Name Of An Abstract Sealed Class p3




    How do I get the class and methods name of an abstract sealed class? Any help will be greatly appreciated.

    DB:3.82:Get The Class And Methods Name Of An Abstract Sealed Class p3


    I disagree. It is possible to make an abstract sealed class in the c cli. Example:
    public ref class MyClass abstract sealed
    {
    ________
    __________
    };

    In most languages, this is what is typically called a static class. (For example, in C#, you can't declare abstract sealed - the compiler enforces this, but if you declare a class static, you get this in IL. Same with a VB Module. ) C/CLI
    is the only language where you can declare it like this, and you weren't saying you were using it - hence my comment.
    It's a class you can't create instances of - and will only contain static members.
    If you're working in C/CLI, an abstract sealed class will only have static method declarations, and no instance method declarations. You can still use Type.GetMethods, but you'll want to use BindingFlags.Static to retrieve them.

    You'd get this, in C/CLI, via:
    // Get the Type handle for your class
    Type^ myType = YourClass::typeid;

    // Get the public (static) methods.
    arrayMethodInfo^^methods = myType-GetMethods( static_castBindingFlags(BindingFlags::Public | BindingFlags::Static) );

    for each (MethodInfo^ mi in methods)
    Console::WriteLine(mi-Name);

    Reed Copsey, Jr. - http://reedcopsey.com
    If a post answers your question, please click Mark As Answer on that post and Mark as Helpful.

  • RELEVANCY SCORE 3.41

    DB:3.41:Help W/Cf8 Java Problem, Works On Cf7 3j




    See the class definitions below.

    In CF7 if create an instance of Outer, say "outer", and code:

    outer.getInner().getID()
    things are fine.

    In CF8, I get the error "The getID method was not found." If
    I cfdump "outer" in CF8 I see
    className: Outer$Inner
    Methods: [list of methods and return types, but not getID]
    Parent Class
    Class Name: AbstractDecorator
    Methods: [list of methods and return types, including
    *getID*]

    Is there something different I need/can do w/CF8 to get to
    the method "getID" on the Parent Class?

    --- Skeleton Class Definitions ---
    public final class Outer {
    Inner inner;
    public Inner getInner() { return inner; }
    public final class Inner
    extends AbstractDecorator {
    }
    }

    abstract class AbstractDecorator extends Wrapped {
    private Wrapped _wrapped;
    public int getID() { return _wrapped.getID(); }
    }
    class Wrapped {
    int ID;
    public int getID() { return ID; }
    }

    DB:3.41:Help W/Cf8 Java Problem, Works On Cf7 3j

    See the class definitions below.

    In CF7 if create an instance of Outer, say "outer", and code:

    outer.getInner().getID()
    things are fine.

    In CF8, I get the error "The getID method was not found." If
    I cfdump "outer" in CF8 I see
    className: Outer$Inner
    Methods: [list of methods and return types, but not getID]
    Parent Class
    Class Name: AbstractDecorator
    Methods: [list of methods and return types, including
    *getID*]

    Is there something different I need/can do w/CF8 to get to
    the method "getID" on the Parent Class?

    --- Skeleton Class Definitions ---
    public final class Outer {
    Inner inner;
    public Inner getInner() { return inner; }
    public final class Inner
    extends AbstractDecorator {
    }
    }

    abstract class AbstractDecorator extends Wrapped {
    private Wrapped _wrapped;
    public int getID() { return _wrapped.getID(); }
    }
    class Wrapped {
    int ID;
    public int getID() { return ID; }
    }

  • RELEVANCY SCORE 3.37

    DB:3.37:Memory And The Number Of Methods In A Class z7




    if a class A has more methods than another class B, then whether instance of class A needs more memory than instance of class B? or only decided by properties?
    in other words, if i put more methods into an existing class, whether it affects performance?

    DB:3.37:Memory And The Number Of Methods In A Class z7

    Non-static methods can be (abstractly) viewed as static methods:

    public class Clazz {
    private int i = 0;
    public void theMethod() {
    this.i = 5;
    }
    }Is similar to
    public class Clazz {
    private int i;
    public static void theMethod(Clazz this) {
    this.i = 5;
    }
    }(Note that this is by no means compilable). So if you can understand why static methods wouldn't be duplicated in memory, you can see why non-static methods don't need to be either.

  • RELEVANCY SCORE 3.37

    DB:3.37:Methods Of Class 3z


    Hi,
    Is there a way to know the methods defined in a class.
    For e.g
    if I want to know if there is a way to get the member name and thier details for e.g in java.math.BigInteger

    Any info is appreciated.

    Thanks

    DB:3.37:Methods Of Class 3z

    Sorry, the API link is this:
    http://java.sun.com/j2se/1.4/docs/api/index.html
    Weird how it copied that, sorry.

  • RELEVANCY SCORE 3.33

    DB:3.33:Re: Private Fields And Methods ks


    but the fields are property of an object and when they are declared private they have to be accessed only in methods of that class when called on that object not the other object of the same class with the first object being an argument???....

    does it make sense or not. .. i dont know

    can any one get me out of this confusion plzz

    DB:3.33:Re: Private Fields And Methods ks

    rajeshrocks25 wrote:
    thats why i have posted it here .. so that if any one knows on what basis they took the decision..... they can pass the infoTry reading the JLS .

  • RELEVANCY SCORE 3.33

    DB:3.33:How To Load Classes? dd


    How to retrive the class name during runtime.....
    suppose if i select java.lang package , i must get all the classes relating to lang package....
    i used reflection API, but using that you can retrive constructor and methods of any class... and i need the classes of perticular package.... how to do it?

    Thank You

    DB:3.33:How To Load Classes? dd

    Double post!

    http://forum.java.sun.com/thread.jspa?threadID=767122

  • RELEVANCY SCORE 3.29

    DB:3.29:Reflection 9c


    Hi there,

    I have two questions related to reflection. I have a small program which reads in the methods of a class. The class read in is a JPanel (it extends from JPanel). It has a JList added, and an inner class registered for ListSelectionEvents (of the JList).
    The skeleton looks like this:

    class gui.WorkAreaGUI extends JPanel {

    private JList list;

    gui.WorkAreaGUI() {
    .....
    list.addListSelectionListener(new ListSelectionHandler());
    }

    class ListSelectionHandler implements ListSelectionListener {

    public void valueChanged(ListSelectionEvent evt) {
    .....
    *** work on JList here ***
    }

    }

    }When I read in the methods of this class, by using classObject.getDeclaredMethods(); I get a few weird looking methods I cannot identify where they come from to name (types filtered):

    static javax.swing.JList access$1(gui.WorkAreaGUI)
    static javax.swing.JList access$3(gui.WorkAreaGUI)Apparently they have something to do with the JList and access from the inner class to the JList. But I do not know why those methods are generated and the more based on what are they generated? And are the names always 'access$X' (where X is a number)? I am not interested in those methods, so can I filter them out by checking on the $ sign in the name? I hope someone can tell me more about this!

    The second question I have is: When fetching for example parameters of a method, besides finding the type (boolean, int, Object etc) is it possible to fetch the real name of the parameter as it was programmed by the programmer in the source (assuming it was compiled by a standard compiler)? So for example:

    void doSomething(int value) {

    }So to retrieve the name: value

    I hope someone can help me out with these questions, I would highly appreciate it!

    Martijn

    DB:3.29:Reflection 9c

    As for the parameter names - no, java does not store those names. It's just the types that matter to the JVM, and so it gives them new, short names (ie String s1, String s2).

    You can override or implement a method and use different parameter names, as long as the type and order are the same since the local scope variables do not have programatically significant names (the names might be important for humans to understand what it does, but they are not important to the JVM).

  • RELEVANCY SCORE 3.29

    DB:3.29:Multiple Beans With Same Class In Jsp Page 8a


    Is it possible to have use multiple JavaBeans with the same class (but different id ) in the same JSP page

    I have an example working where the page looks like

    %@page import="java.util.Date" session="true" %
    jsp:useBean id="verifyloggingBean" scope="session" class="com.nexor.LoggingBean"/
    jsp:setProperty name="verifyloggingBean" property="*" /
    jsp:useBean id="secureloggingBean" scope="session" class="com.nexor.LoggingBean"/
    jsp:setProperty name="secureloggingBean" property="*" /

    later on in the page I can user
    INPUT NAME="logLocation" VALUE="jsp:getProperty name="verifyloggingBean" property="logLocation" /"

    and
    INPUT NAME="logLocation" VALUE="jsp:getProperty name="secureloggingBean" property="logLocation" /"

    To read the default bean values into the inputs

    However when the inputs are submitted, the securelogginbean gets the values of the first bean
    How do I distinguish one from the other -when they have the same class and the same set and get methods ??

    DB:3.29:Multiple Beans With Same Class In Jsp Page 8a

    In that example, what you seem to be saying is that the 2 fields have the same value. Well, of course. You are using the same bean class as 2 names, and you are setting all the properties of those beans to whatever values were submitted, then getting the same property from each one for the form fields. Those beans are going to initialize the same and be filled the same, so they are going to have the same info in each field.

  • RELEVANCY SCORE 3.28

    DB:3.28:Tree Issue kc



    Hi,

    I'm trying to display methods of an ABAP class in a tree in WDA but none are being displayed. The class is CL_GUI_ALV_GRID. This is an exercise in the Getting Started with WDA book. The context in my view, as mapped from the component controller context, is:

    class_sel_crit 1:1 cardinality

    name_class

    descr_class

    methods 0:n cardinality

    name

    kind_icon

    is_class

    is_interface

    is_redefined

    where class_sel_crit and methods are nodes and the others are attributes. I have a tabstrip in ROOTUIELEMENTCONTAINER, a couple of tabs in the tabstrip, a transparent container in the tab for the tree, a tree in this container, and a tree item in the tree. The tree datasource is bound to the view.methods node. The tree item datasource is bound to the view.methods node and the enabled and rootvisible properties are enabled. The tree item text is bound to the view.methods.name attribute of the methods node of the view. There are methods in my component controller to get and set the class methods. I appreciate your help.

    Thanks,

    John

    DB:3.28:Tree Issue kc


    Baskaran,

    In debug I determined that the methods weren't being called until after the user clicks on the button to select the class from the input field, even though CL_GUI_ALV_GRID is the default class. So I guess that's the way it's supposed to work. I awarded points.

    Thanks,

    John

  • RELEVANCY SCORE 3.26

    DB:3.26:Powershell Win32_Printer Object Methods 3s


    Hey Scripting Guys,
    The WMI Win32_Printer class defines 11 methods, one of which is setDefaultPrinter. How come when I create an instance of the Win32_Printer in Powershell ([wmiclass]Win32_Printer) and pipe it to get-member, it only shows the method
    AddPrinterConnection and not the other 10 methods defined in the WMI class?

    ScottNetwork: It's not just a job, it's an OBSSESION!

    DB:3.26:Powershell Win32_Printer Object Methods 3s

    (gwmi -class win32_printer
    -Filter ShareName='testprint').setdefaultprinter()
    This is what I needed. I was not sure how to filter on the newly added printer. Thanks Grant.Networking: It's not just a job, it's an OBSSESION!

  • RELEVANCY SCORE 3.25

    DB:3.25:Getting Class Methods In Sequence Diagrams z8


    Hello,
    I'm working with JDeveloper 10.1.3.2.0 and I'm doing my first steps with UML diagrams.

    I began with a class diagram and everything went OK, but when I tried to do a sequence diagram I had some trouble: when I tried to connect an actor with an lifeline of a concrete class (using the palette component "Message") I was hoping to get all the available methods of the class in some kind of list, but the only thing I can do is write a name for the message. And this name doesn't become a new method for this class.

    I think these are common features in other UML software.
    Does anyone know if any of these is possible in JDeveloper?

    Thanks

    DB:3.25:Getting Class Methods In Sequence Diagrams z8

    Hello,
    I'm working with JDeveloper 10.1.3.2.0 and I'm doing my first steps with UML diagrams.

    I began with a class diagram and everything went OK, but when I tried to do a sequence diagram I had some trouble: when I tried to connect an actor with an lifeline of a concrete class (using the palette component "Message") I was hoping to get all the available methods of the class in some kind of list, but the only thing I can do is write a name for the message. And this name doesn't become a new method for this class.

    I think these are common features in other UML software.
    Does anyone know if any of these is possible in JDeveloper?

    Thanks

  • RELEVANCY SCORE 3.23

    DB:3.23:Reflection sd


    Can someone told me that how can i use the invoke() of Method. I am facing this error. "java.lang.IllegalArgumentException: Object is not an instance of declaring class".

    Actually I want to call a Method "performTest" of another class. The class name is in String Variable. My code is as follows:

    Object result = new Object();
    try {
    // Instantiate Dynamic Class
    Class test = Class.forName(testHandler,true,this.getClass().getClassLoader());
    test.newInstance();

    // Pick up the Method of the Dynamic Class
    Method[] methods = test.getMethods();
    Method performTest;
    //Object[] obj = {testName, params};

    if(methods[0].getName().equals("performTest")) {
    performTest = methods[0];

    // Execute the Method
    result = performTest.invoke(test, new Object[] {testName, params});

    testHandler is the variable which contains the class name, and performTest is the method, I want to execute. The method recieves two paramters, which is String and Hashtable and returns a String.

    Any Helps,
    THanks

    Raheel

    DB:3.23:Reflection sd

    As it was already said you need to pass the instance of the object of the given class, and not the Class object for the class itself, therefore you should change following lines:

    test.newInstance();
    to
    Object createdObject=test.newInstance();

    and

    result=performTest.invoke(test, new Object[] {testName, params});
    to
    result=performTest.invoke(createdObject, new Object[] {testName, params});

    Regards,
    Marcin Sciesinski

  • RELEVANCY SCORE 3.23

    DB:3.23:Ca1033 (Interface Methods Should Be Callable By Childtypes) - False Positive? k9


    "Make 'XYSeries' sealed (a breaking change if this class has previously shipped), implement the method non-explicitly, or implement a new method that exposes the functionality of 'IChartSeries.get_Name():String' and is visible to derived classes." public class TabularData { private string name; public string Name { get { return name; } set { name = value; } } } public interface IChartSeries{ string Name { get; set; } } public abstract class XYSeries : TabularData, IChartSeries {}

    DB:3.23:Ca1033 (Interface Methods Should Be Callable By Childtypes) - False Positive? k9

    Andrew,
    Thanks for chasing this down. I've reproduced this and filed a bug. The above code also appears to incorrectly fire ParameterNamesShouldMatchBaseDeclaration with the following message: Change parameter name 'param0' of method XYSeries.ClassLibrary3.IChartSeries.set_Name(String):Void to 'value' in order to match the identifier as it has been declared in IChartSeries.set_Name(String) :Void.
    Thanks for the feedback!
    Regards
    David

  • RELEVANCY SCORE 3.22

    DB:3.22:Loading A Class File xa


    Is there a way to load a class file and get the corresponding Class object, without knowing the fully qualified name of the class in the class file? All the relevant methods in ClassLoader require that you provide the full name of the class that would be loaded from the class file.

    Basically, I would like to load a class file and get the Class and determine what package it belongs to.

    Also, is there any APIs for enumerating the classes within a package?

    Thanks.

    DB:3.22:Loading A Class File xa

    Many thanks. defineClass passing null for the class name works like I need it to. 7 Dukes to you. That's what I get for not RTFM carefully.

    Thanks again.
    -Rick

  • RELEVANCY SCORE 3.22

    DB:3.22:Use Xmlserializer To Serialize Ienumerable Interface 3x


    XmlSerializer requires a concrete type in order to serialize. However some of the public property is declared to be IEnumerable, for generality. Such types are not easily consumable by the XmlSerializer

    However, it reserve you the ability to custom the XmlSerializer, by making you class as implementing the

    IXmlSerializable, you can actually control how those IEnumerable members serialize/deserialize

    Below show an example, there are two classes, one is a Method type.
    public class Method
    {
    public string Name
    {
    get;
    set;
    }

    public Liststring Args
    {
    get;
    set;
    }
    }

    and the other is Class type.

    public class Class
    {
    private ListMethod m_Methods;

    public IEnumerableMethod Methods
    {
    get
    {
    return m_Methods;
    }
    set
    {
    m_Methods = value.ToListMethod();
    NotifyPropertyChanged(Methods);
    }
    }

    After implementing the IXmlSerializable, here is the new Class type.
    [Serializable]
    public class Class : INotifyPropertyChanged
    , IXmlSerializable
    {
    [XmlElement(Methods)]
    private ListMethod m_Methods;

    [XmlIgnore]
    public IEnumerableMethod Methods
    {
    get
    {
    return m_Methods;
    }
    set
    {
    m_Methods = value.ToListMethod();
    NotifyPropertyChanged(Methods);
    }
    }

    #region INotifyPropertyChanged Members

    /// summary
    /// Notify property changed.
    /// /summary
    /// param name=name_Property changed./param
    protected void NotifyPropertyChanged(string name_)
    {
    var propertyChanged = PropertyChanged;
    if (propertyChanged != null)
    {
    propertyChanged(this, new PropertyChangedEventArgs(name_));
    }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion

    #region IXmlSerializable

    public System.Xml.Schema.XmlSchema GetSchema()
    {
    // TODO:
    // no schema information is associated
    return null;
    }

    public void ReadXml(System.Xml.XmlReader reader)
    {
    reader.ReadStartElement(Class);
    var Methods = new ListMethod();
    while (!reader.EOF)
    {
    reader.ReadStartElement(Methods);
    switch (reader.Name)
    {
    case Method:
    while (!reader.EOF reader.IsStartElement())
    {
    var Method = ReadMethod(reader);
    Methods.Add(Method);
    }
    break;
    default:
    throw new XmlException(string.Format(Element {0} unexpected, reader.Name));
    }

    if (reader.IsStartElement())
    {
    throw new XmlException(Start of Element unexpected);
    }
    else
    {
    reader.ReadEndElement();
    break;
    }
    }
    reader.ReadEndElement();
    }

    private Method ReadMethod(XmlReader reader)
    {
    reader.ReadStartElement(Method);
    reader.ReadStartElement(Name);
    var name = reader.ReadContentAsString();
    reader.ReadEndElement();

    reader.ReadStartElement(Args);
    var args = new Liststring();
    while (!reader.EOF)
    {
    if (reader.IsStartElement())
    {
    reader.ReadStartElement(string);
    var arg = reader.ReadContentAsString();
    args.Add(arg);
    reader.ReadEndElement();
    }
    else
    {
    reader.ReadEndElement();
    if (reader.IsStartElement()) throw new XmlException(Start of Element unexpected);
    break;
    }
    }
    reader.ReadEndElement();

    return new Method() { Name = name, Args = args };
    }

    private void CheckThrow(XmlReader reader, string elementName)
    {
    if (reader.EOF || reader.Name != elementName)
    throw new XmlException(string.Format(Element {0} unexpected, reader.Name));
    }

    public void WriteXml(System.Xml.XmlWriter writer)
    {
    writer.WriteStartElement(Methods);

    foreach (var item in Methods)
    {
    writer.WriteStartElement(Method);
    writer.WriteStartElement(Name);
    writer.WriteString(item.Name);
    writer.WriteEndElement();
    writer.WriteStartElement(Args);
    foreach (var arg in item.Args)
    {
    writer.WriteElementString(string, arg);
    }
    writer.WriteEndElement();
    writer.WriteEndElement();
    }
    writer.WriteEndElement();
    }
    }
    #endregion IXmlSerializable
    and you can test your code with the following drive code;

    public static void Main(string[] args)
    {

    Class cm = new Class();
    cm.Methods = new[] {
    new Method { Name = Sum, Args = new Liststring() { Arg1, Arg2 } },
    new Method { Name = Sum2, Args = new Liststring() { Arg1, Arg2 } }
    };

    var xs = new XmlSerializer(typeof(Class));
    using (FileStream fs = new FileStream(PersistenceStorage, FileMode.OpenOrCreate))
    {
    xs.Serialize(fs, cm);
    }

    using (FileStream fs = new FileStream(PersistenceStorage, FileMode.Open))
    {
    var cm2 = xs.Deserialize(fs) as Class;

    Console.WriteLine(The serialization is successfully);
    }

    }

    This work on a simplified model, what if the Class type has super class, which has its own types, how will the super type be serialized? Or is there any suggested solution/pattern as to the custom serialization?

    Or the customization as such are after all recommened for IEnumerable?
    Joe Wang

    DB:3.22:Use Xmlserializer To Serialize Ienumerable Interface 3x

    The IXmlSerializablereplacesthe defaultserialization. If your class has a superclass, it's the responsibility of the WriteXml and ReadXml methods to serialize and deserialize the members of the superclass.
    Note that the Serializable, XmlElement and XmlIgnore attributes are useless in your example. Serializable is used only for binary serialization. The other two are used by the
    default xml serialization (and only when they're on public members).

  • RELEVANCY SCORE 3.22

    DB:3.22:Why There Should Not Be Many Static Methods. jx


    Why a java class should not have many static methods.How is memory managed in case of static methods.
    If a Utility class has static methods then we can use methods directly by class name but if we do not make the methods static then we can acess methods using object.How does it make the difference.I know that there remains a single copy of class variables/methods.But i want to know how class memory is managed and garbage collected.

    DB:3.22:Why There Should Not Be Many Static Methods. jx

    shobhit123 wrote:
    Why a java class should not have many static methods.How is memory managed in case of static methods.
    If a Utility class has static methods then we can use methods directly by class name but if we do not make the methods static then we can acess methods using object.How does it make the difference.I know that there remains a single copy of class variables/methods.But i want to know how class memory is managed and garbage collected.The reason to discourage static methods is stylistic rather than technical. It encourages object oriented thinking.

    Each loaded class is represented by a Class object, and associated with that it a block of memory for static fields. As with all such storage this block is, as viewed from code, rather like an array with one, or in the case of double or long values, two slots per field.

    Because the class loader maintains a map from FQN to Class this storage is only released if the class loader that loaded it becomes unreachable, which happens only in situations like the un-deployment of a web application or EJB.

    Local variables for static methods are allocated in a stack frame, just as with instance methods. There's really no significant difference there.

  • RELEVANCY SCORE 3.21

    DB:3.21:[Operationcontract] Methods m9


    In my [OperationContract] attribute I have written three methods like:
    [OperationContract(Name=RolebyName)]
    [WebInvoke(UriTemplate = Role/{name}, Method = GET, RequestFormat =WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json,BodyStyle = WebMessageBodyStyle.Bare)]
    Role1 GetRole(string name);
    [OperationContract(Name=RolebyProviderId)]
    [WebInvoke(UriTemplate = Rolebypid/?pid={providerId}, Method = GET, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]
    Role1 GetRolebyId(Guid providerId);
    [OperationContract(Name=RolebyCompanyProviderId)]
    [WebInvoke(UriTemplate = RolebyCPid/?companyId={companyId}providerId={providerId}, Method = GET, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]
    Role1 GetRolebyCPId(Guid companyId, Guid providerId);
    I am implementing these three methods separately in Service.cs class
    My question is... Instead of implementing as three methods separately can I implement a single class and implemnt the methods inside it ?
    If so how can I declare the class in [OperationContract] and also implement it in Service.cs;Based on the parameter passed it has to call that particular method

    DB:3.21:[Operationcontract] Methods m9

    Hi,
    You can create a method as follows -
    [WebInvoke(UriTemplate=Role/?name={name}pid={providerid}cid={companyid}, Method=GET)]
    public Role1 GetRoleCommonMethod(string name, Guid providerid, Guid companyid)
    {
    if (name != null)
    return GetRole(name);

    if (providerid == Guid.Empty companyid == Guid.Empty)
    return GetRolebyCPId(companyid, providerid);

    if (providerid != null)
    return GetRolebyId(providerid);
    else
    throw new ArgumentException(Invalid arguments);
    }
    Now you can test the service by invoking it using urls shown below and it will internally call the appropriate method.
    http://localhost:49779/Service1.svc/Role?pid={12300000-0000-0000-0000-000000000000}
    http://localhost:49779/Service1.svc/Role?Name=Nauzad
    You should stop decorating the other 3 methods using the OperationContract (which was always unnecessary) and the WebInvoke attributes.
    Regards,
    Nauzad Kapadia

    Please Mark as Answer if a post has answered your question or Vote as Helpful if it was helpful in some way. Here's

    why

  • RELEVANCY SCORE 3.18

    DB:3.18:Problem With Implementing Timedobject, Ejb Verification Fail xa



    Hi, i'm using jboss 3.2.5. Developing in myeclipse with xdoclet.I have a session bean wich implements the javax.ejb.TimedObject interface. Everything compiles, but under deployment i get an ejb spec violation.Section: 22.2Warning: The Bean Provider must specify the fully-qualified name of the Java class that implements the enterprise bean's business methods in the ejb-class element.I have searched google and this forum, but can't find a solution. Please help.

    DB:3.18:Problem With Implementing Timedobject, Ejb Verification Fail xa


    ejb timers are only available in 4.0.x, this is a j2ee1.4 feature.

  • RELEVANCY SCORE 3.18

    DB:3.18:Jsp 2.0 El Function Overloading a9


    Can methods defined as EL functions be overloaded?

    I have a class with two overloaded methods. Both of them are declared with "public static" and one of them is defined as an EL function through a taglib. When trying to invoke the method defined as an EL function, I get an error indicating it's trying to run the other version of the method, not the version defined as an EL function.

    What's weird is that if I rearrange the order of the overloaded methods in my class it works fine. It's as if EL is just looking for the first method with a name matching what's defined in the tablib and attempting to run it.

    I'm running WebLogic Server 10 on WinXP.

    DB:3.18:Jsp 2.0 El Function Overloading a9

    Either declare it non-public or assign it another name.

  • RELEVANCY SCORE 3.18

    DB:3.18:Taskservice 'S Implemenation 11



    TaskService interface has 2 implementations , one is called LocalTaskService class and one is called SyncTaskServiceWrapper class.

    In the SyncTaskServiceWrapper class , it contains an instance of another interface called AsyncTaskService .

    All methods of the SyncTaskServiceWrapper that are specified by the TaskService interface will be delegated to AsyncTaskService .

    So SyncTaskServiceWrapper works asynchronously or synchronously?? It is confusing when looking at the name of the class .

    Is it better to rename SyncTaskServiceWrapper to AsyncTaskServiceWraper as it wraps AsyncTaskService ??

    DB:3.18:Taskservice 'S Implemenation 11


    Thanks Mauricio.

    I get the idea of the meaning of SyncTaskServiceWrapper now. Thanks

  • RELEVANCY SCORE 3.17

    DB:3.17:Which Of This Is True About Class And Object? 3a


    (a) A class is made of objects
    (b) A class is a collection of objects
    (c) A class supplies or delivers objects to the rest of the application
    (d) A class is used as a template to create objects
    (e) An object inherits its variables and their values from its class
    (f) An object inherits its variables and methods from its class
    (g) An object inherits its variables and methods from its class and its superclasses
    (h) The variables and methods of a class are defined in its objects
    (i) The variables and methods of an object are defined in its class
    (j) The variables, variable values and methods of an object are given in its class

    DB:3.17:Which Of This Is True About Class And Object? 3a

    Thanks for the reply.

    Any recommendation of good Java reference book for beginner? I am reading "Introduction to Java Programming" by Daniel Liang and Cay Horstman. I think both are good but am finding reference book which can provide more code samples and explanatory notes.

    Cheer!

  • RELEVANCY SCORE 3.17

    DB:3.17:How To Get User Organization 19


    Does anyone know that from a user object, how can I obtain the name of user organization? (not from user view)

    I have tried to call several methods but to no avail. The method getMemberObjectGroups seems to return me an array of ObjectGroup class, but I just could not access the item in the array to properly call methods in ObjectGroup class.

    DB:3.17:How To Get User Organization 19

    Thanks very much Steve.

    My understanding is cleared up too! :)

    Adi.

  • RELEVANCY SCORE 3.17

    DB:3.17:Run-Time Binding Determining Class Type 1c


    Hi,

    I have four classes - Point, Point2D, Point3D and Location. Point contains variables and methods that are common to all points and Point2D and Point3D extend the Point abstract base class. The Location class has as a data member a reference to a Point. I am able to create an instance of either of the Point concrete subclasses, Point2D or Point3D, and pass a reference to the Location class constructor. Although the reference to either a Point2D or Point3D is stored as a Point I can cast it back to its true type. I can also take the reference and get the name of the class using - point.getClass().getName() - which gives me either Point2D or Point3D. I have tried to find out what methods are provided by Point2D or Point3D but I just get the methods belonging to the Class object. Is there any way to get a list of Point2D or Point3D methods? or to create or cast a reference from Point to Point2D without writing the code explictly. What I am trying to say is that the application code is aware of the existence of the Point class but I would like it to be able to handle the creation of new Point subclasses without needing to know that there is a Point2D class or a Point3D class.

    I would be extremely grateful for any help,

    Thanks,

    Sean

    DB:3.17:Run-Time Binding Determining Class Type 1c

    The expression A a = new B() produces an object that
    is actually of type B which is a subclass of A and
    casts it to type A. This upcast (or widening cast) is
    always possible and doesn't need an explicit cast. The
    methods that are available to a are actually the
    methods as defined in B since java methods are always
    virtual in the C++ sense. I have a feeling no one is paying attention anymore, but I'm bored. At compile time, the methods available to a are only those defined in type A. At runtime, it's everything defined in type B.

  • RELEVANCY SCORE 3.17

    DB:3.17:.Class File From Class Object, Possible? z3


    Hi,
    We all know Class object is an in-memory representation of a class file.
    Class cls=Class.forName("Sample.class");
    Class object contains all the information about attributes and methods mentioned in a class file.
    My question is: Is it possible to write a .class file from a Class object?

    Note: We are not talking about Class.getMethods() and any other reflection methods.

    DB:3.17:.Class File From Class Object, Possible? z3

    This means, java.lang.Class only hold the Class definition
    only, same with the ClassLoader. The business logic is
    stored somewhere inside the JVM's stack.I tried experiment very similar to this. What i found that the "myclass" file which holds the Dummy's Class object had very small size 20 bytes. The size of Dummy's .class file is 200 bytes. So i suspect whether the serialized Class object contains Dummy's class definition or not.
    Anyway JVM does not allow deserializing the myclass file in absence of Dummy.class file. So I have come to the conclusion that
    1. The serialized Class object doesn't contain any information of the class definition it refers to(Dummy in this case) except its name(Dummy).
    2. Deserilizing a Class object has no meaning unless you have a .class file of the object the Class object refers to; and hence
    3. Class object itself can not exist as a separate entity. It always has to have associated class definition with it in order to do any operation with it.
    Question remains: What can one achieve by serializing a Class object? API strongly emphasizes Class is serializable.

    If you want to transfer .class thru wire, my
    suggestion is, just read the file using
    FileInputStream, transfer it thru wire, let the remote
    machine receive and use ClassLoader.defineClass()
    function.I used URLClassLoader instead.

    Thanks for your thoughts,
    kishor

  • RELEVANCY SCORE 3.17

    DB:3.17:Invoking An Object Whose Name I Am Getting As A String c7


    I am getting the name of the class together with it's package structure as a string.
    for example "nim.util.tobeDone.Class"
    Now I want to Instantiate an object of this class.
    If I use Class.forName Class 's getInstance() method I get the Object of type Object and hence i can't Invoke the methods of that Object.

    DB:3.17:Invoking An Object Whose Name I Am Getting As A String c7

    I know, but interfaces are typechecked at compile time and you know exactly the type - even have the opportunity to use the build-in types (int,char,...) instead of only classses.
    Also, calling the methods through reflection is a little less readable, at least in my humble view ;-)

  • RELEVANCY SCORE 3.17

    DB:3.17:Get Class Name And Available Methods Name In The Class ad


    Hi,I am integrating visual studio using VSIP. Is there any way to to get the class name and methods name available in that class for any Source code file(Active Document).Thnaks.AKB

  • RELEVANCY SCORE 3.16

    DB:3.16:How To Keep Base Class Methods Private In A Derived Class 9x


    I am writing an API (C# class library) to distribute to users of my product. I derive this class (derived.cs) from a base class (base.cs) so that it is a wapper for the base class so that the base class is hidden. I have declared the methods in the base class as protected so that my derived class can have access to them. However, when using the the resulting .dll as a reference in another application the name of the base class, plus all of its protected methods are exposed (in the object viewer). I have also tried to declare the base class as protected, but apparently this is not allowed.
    I would prefer that my customers not be able to see the base class protected methods. How can I hide the name  methods of the base class?

    DB:3.16:How To Keep Base Class Methods Private In A Derived Class 9x

    JD,
    if your base class and your derived class are in the same class library you can declare the methods of the base class internal.
    That is actually what I did, and I could still see the internal protected methods in the object viewer of the app that referenced the class library (.dll).

  • RELEVANCY SCORE 3.16

    DB:3.16:How To Get The Methods From Exe File. j1


    I have an created an exe file for the java classes , what I want to do is load that exe and I have to calll a method of that loaded exe file which includes the class file and I have to call the methods from that exe file.

    DB:3.16:How To Get The Methods From Exe File. j1

    Why dont use Obfuscators to convert the code while sending to to client and signing the jar will solve your problem

    [http://java-source.net/open-source/obfuscators]

  • RELEVANCY SCORE 3.15

    DB:3.15:How To Call A Method Using A Array Of That Object? 73


    hey, another array question
    for example i have 2 classes one name class and a driver
    inside the name class i have method that gets the name
    public Name getName1( ) {return name1;}

    my question is if i created an array of Name objects in my driver with the following line
    Name [ ] n1 = new Name [ ] ;

    and i wanna call methods inside the name class using my array of Name that i created how do i do it?
    thanks in advance

    DB:3.15:How To Call A Method Using A Array Of That Object? 73

    thanks for the reply Maxx
    another question regarding arrays

    for example if im doing an array of objects Name[ ] n1 = new Name [ ]
    and i have a method that removes the name if its the same as the user input
    if (n1[ i ].getName.equals(myName))
    / / if they equal it removes it,

    else,
    / / the n[ 1 ] stays the same

    ive search the forum for previous questions on this but their examples doesnt seems to work, can anyone help? also if end up using this remove method that checks the elements in n1 if it matches it will remove it what should i do to avoid nullpointerexceptions if i wanna shift it all down?
    thanks in advance

  • RELEVANCY SCORE 3.15

    DB:3.15:Simple Design Question (Class Inheritance) zs


    I have 2 classes with several identical methods with the exception of one method whose name is the same but has different signatures in each class:
    public class A
    {
    // methods A-Z

    public void doThis(String a, String b)
    {
    // do something
    }
    }

    public class B
    {
    // methods A-Z

    public void doThis(String a, String b, Integer c)
    {
    // do something else
    }
    }The question is, what's the best design for this? I was thinking of creating an abstract class and moving methods A-Z (the identical methods) there. Then classes A and B would inherit from that class and each would define its version of doThis. But is this the best way of doing it?

    Thanks!

    DB:3.15:Simple Design Question (Class Inheritance) zs

    goblin wrote:
    But is this the best way of doing it?In addition to what the others have said, I would point out that the "best way" depends on specifics of what you're trying to model, your requirements, the broader codebase into which it fits, etc. There's no right answer for the general case with a placeholder model such as this.

  • RELEVANCY SCORE 3.14

    DB:3.14:How To Pull Method Names From An Object? 8c


    Hi,

    I am new to java development. I need to create a generic class where an object will be passed and I need to pull the various get methods from the passed object, use the get methods to create a name-value pair and return a hashmap. How can I get the method names from the passed objects?

    Thanks

    DB:3.14:How To Pull Method Names From An Object? 8c

    This is definitely advanced stuff for a newbie to consider.

    You forget to mention your problem domain and your goal. What are you attempting to solve with this? Chances are, you should be doing something simpler.

  • RELEVANCY SCORE 3.14

    DB:3.14:How To Get This Type Of Class? 1a


    Hi. I'm trying to make a class like Math which i can run his methods without declaring an object.

    I want this:

    MyClass.method();

    not this:

    MyClass a = new MyClass();
    a.method();

    How can i do it? And what's the name of this type of classes?

    DB:3.14:How To Get This Type Of Class? 1a

    A proper candidate for a static method in the above situation would be for example a method that would return the number of instantiated objects of the class (the number of read textfiles). This information doesn't belong to any specific object but to the class as a whole.

  • RELEVANCY SCORE 3.14

    DB:3.14:Re: Narrowing Down An Error.... 7x


    Let me try English.

    You can declare a variable inside a class, but outside of methods. That variable has class scope, and, unless it is masked by a variable of the same name in a method, is visible in the class methods.

    If you declare a variable in a method, it is only "alive" while that method is being executed. As soon as the method returns, the method variable "disappears". Sounds like magic, right. Anyway, it becomes garbage, the garbage collector is going to come get rid of it, and you can't access it.

    If the method variable has the same name as a class variable, it will hide, or mask, the class variable while the method is executing. Then, when the method variable goes away, you can see the class variable. However, it will not have any of the mods you made to the method variable.

    Finally, only static class variables are visible in static methods (unless you instantiate and instance of the class inside the static method, but I will not go into that right now).

    DB:3.14:Re: Narrowing Down An Error.... 7x

    Thanks for all the help fellas, I just put 'static'
    in front of it and worked great. :)You're welcome. You need to understand static, though. You just don't want to make everything static.

  • RELEVANCY SCORE 3.14

    DB:3.14:Mapping Java Arrays xj


    I was given an object model generated by an apache product, Axis. The generated java files use the Java Array in the following fashion:

    Class Zoo {
    private ArrayOfAnimals animals;
    // public get/set methods cut
    }

    Class ArrayOfAnimals {
    private Animal animals[];
    // public get/set methods cut
    }

    Class Animal {
    private String name;
    // public get/set methods cut
    }

    I was tasked with mapping the one-to-many relationship between zoo and an array of animals using the Animal array. I cant find a mapping in TopLink to do this type of association. I am NOT allowed to modify the generated source code. I may be able to extend the generated classes, and perhaps provide a different superclass.

    I am allowed to create the relational model for these domain classes. Can anyone help with this type of mapping?

    Thanks

    DB:3.14:Mapping Java Arrays xj

    TopLink does not directly support arrays as the mapping type for a collection, only collection types that support the Collection and Map interfaces.

    In general it seems odd to use an array instead of a Java collection which would be much more efficient (in terms of adding and removing) and much more functional. I would definitely suggest changing the generated code, or the way the code is generated if at all possible.

    The easiest way to map the array in TopLink would be the use get/set methods for the 1-m mapping on the Zoo class that converted the array to/from a Collection.

    i.e. something like,

    public List getAnimalsList() {
    return new Arrays.asList(animals.animals);
    }
    public void setAnimalsList(List list) {
    animals.animals = (Animal[]) list.toArray();
    }

    In general TopLink uses its ContainerPolicy class to handle collections. It may also be possible (but advanced) to write a custom container policy for your 1-m mapping that handles arrays.

  • RELEVANCY SCORE 3.14

    DB:3.14:Runtime Classes xj


    How to retrive the class name during runtime.....
    suppose if i select java.lang package , i must get all the classes relating to lang package....
    i used reflection API, but using that you can retrive constructor and methods of any class... and i need the classes of perticular package.... how to do it?

    Thank You

    DB:3.14:Runtime Classes xj

    Probably this link may be useful.

    http://www.jonpeck.com/forum/viewtopic.php?t=88

  • RELEVANCY SCORE 3.13

    DB:3.13:How Can You Create An Instance Of A Class Using Classloader Given Only 8x


    the class name as a String. I have the code below in the try block.

    Class myTest = this.getClass().getClassLoader().loadClass("Testclass");
    Object obj = myTest.newInstance();
    String className = obj.getClass().getName();I don't want to typecast the class like
    Testclass obj = (TestClass) myTest.newInstance();I want to be able to create the classs at runtime and then get the methods in the class and execute those methods. Can it be done without having to code the typecasting in before compile time?

    DB:3.13:How Can You Create An Instance Of A Class Using Classloader Given Only 8x

    I read on the web of people creating objects from interfacesDoesn't sound like the thing to do... Theoretically you could create dummy classes on the fly that implement some interface, but that's not very useful.

    Sounds like you are trying to load classes and execute them via interfaces. Like this:
    Class clazz = Class.forName("java.util.LinkedList");
    Collection c = (Collection) clazz.newInstance();
    c.add("hello");
    c.add("world");
    System.out.println(Arrays.toString(c.toArray()));LinkedList is the class, Collection is the interface which LinkedList implements. You can then call the methods declared in the interface. The interface gets "compiled in" into the program and the classes that implement it get loaded whenever and from wherever you load them.

    You could also use reflection to call methods without an interface, but that is type-unsafe, inelegant, hackish, and just plain ugly.

  • RELEVANCY SCORE 3.12

    DB:3.12:Two Methods With The Same Name In One Class zp


    Hi Guys,I would like to ask you for help as I do not know how to get from the following situation. By mistake I managed to create in one class two methods with the same name. I deleted one of those methods. However the whole class is stell in error after validation and the error message says 'method x has already been implemented'.Do you have any idea what steps i need to do to remove the whole method at all. I cannot see it in the list of methods under the class.Many thanks in advance,Jan

    DB:3.12:Two Methods With The Same Name In One Class zp

    Did you perform these actions (from the "Menu Functions"):1. Utilities -- Clean Up -- Method Includes (basically select the one which is relevant in your case).2. Utilities -- Regenerate Sections.BR,Suhas

  • RELEVANCY SCORE 3.12

    DB:3.12:Name And Class Fields In Mmbopinfo Descriptor mk



    From the docs for MMBOpInfo descriptor:name: operation nameclass: fully qualified class where method is definedFirst off, the class field is pointless because by the time you try to invoke() on a resource you *only* care about methods exposed in the resource.On to "name".When trying to resolve a Method object for invoke() do I use the "name" from the descriptor or do I use the the name from the MMBOpInfo?I would have assumed I would use the one from MMBOpInfo 'cause that's where I have to get the signature from. But then again, the spirit of Descriptors seems to be virtualising everything (operation name "foo" resolves to a method "bar") so maybe I should use the "name" field in the descriptor..."name" might also be some sort of unique token so that setMethod and getMethod entries in an MMBAttrInfo descriptor can resolve the correct operation...Choices, choices.Sigh.Trev

    DB:3.12:Name And Class Fields In Mmbopinfo Descriptor mk


    I.e. getter has zero length arg list and returns non-void, setter returns void and has arg list.length == 1, and setter and getter must both refer to the same type.yes, that's the only way it would seem to work. Although it's something that they really should add to the spec and say explicitly. I'm assuming another restriction when binding an Attribute to an operation - that the type for the operation return value and arg list is identical to the type for the attribute. I.e. I won't be doing any isAssignableFrom() checks.ok.-- Juha

  • RELEVANCY SCORE 3.12

    DB:3.12:Invoke pp


    Is this looking ok to you??

    invoke name='setActualizadaUserInfo'
    new class='com.company.classname'/
    refuser.waveset.accountId/ref
    refuser.waveset.attributes.sapfechaini/ref
    refuser.waveset.attributes.sapfechafin/ref
    refuser.waveset.attributes.sapmenuin/ref
    refuser.waveset.attributes.sapprinter/ref
    refuser.waveset.attributes.sapusuariocopia/ref
    /invokeI'm invoking other methods of the same class but with no parameters and is working but not this one.... I get this:

    com.waveset.util.WavesetException: Can't call method setActualizadaUserInfo on class com.company.classname com.company.sap.exceptions.SAPException

    DB:3.12:Invoke pp

    Looks like your class is throwing an exception when you call the method. Try the following:

    1. Enclose your invoke in a block trace='true'/block tag and view the trace output to ensure that you are calling your function with expected argument values.
    2. Run your web/app server with java debugging turned on and connect to the java application through jdb. Set a "catch" breakpoint in JDB and examine the stack trace and locals when this exception is being thrown. This should give you a better idea of what is causing the exception.

  • RELEVANCY SCORE 3.12

    DB:3.12:How To Hide A Member In Intellisense fm


    Hello,I'm writing a C++ class in native C++ (not C++/CLR) and I'm using __declspec(property) to access get/set methods as properties (like in C# and VB.NET). Now, the problem is that both the property name and the get/set methods show in the intellisense list. Is there anyway to remove the names of the get/set methods from the intellisense list?Here's an example, I have two methods, one is a get method with the name getText and another set method with the name setText, the name of the property is Text. I only want Text to show in the intellisenselist, I don't want either getText or setText to show up in the list.Thanks for any suggestions...

    DB:3.12:How To Hide A Member In Intellisense fm

     
    No.
    The reason is that the get and set functions are real so you can access then directly if you want instead of via the property. That is why intellisense shows them.

  • RELEVANCY SCORE 3.12

    DB:3.12:How To Use Readonly Collections With Code Only cs


    Hello,
    I am new to code only development with entity framework 4.1 and currently experimenting with it (together with SQL Server Compact 4.0).
    Now my problem is that I see no way how I can use readonly collections for 1 to n or n to m associations. Instead of the add and remove methods of the collections I want to use add/remove methods in the class that owns the collection. With these custom add/remove
    methods I want to preserve a consistent object model.
    Here is an example of a model with Movies and Actors (note the CreateRole Method of the Movie class):

    public class Movie
    {
    [Key]
    public int Id { get; private set; }

    public string Title { get; set; }

    private ListRole _Cast;
    [InverseProperty(Movie)]
    public virtual IListRole Cast // I want this to return a ReadonlyCollectionRole
    {
    get
    {
    if (_Cast == null)
    {
    _Cast = new ListRole();
    }
    return _Cast;
    }
    }

    public Role CreateRole(Person actor, string name)
    {
    var newRole = new Role(actor, this, name);
    this.Cast.Add(newRole);
    actor.AddPlayedRole(newRole); // this AddPlayedRole method is internal! PlayedRole should be a readonly Set
    return newRole;
    }
    }

    public class Role
    {
    private Role() { }

    internal Role(Person actor, Movie movie, string name)
    {
    Actor = actor;
    Movie = movie;
    Name = name;
    }

    [InverseProperty(PlayedRoles)]
    public virtual Person Actor { get; private set; }

    [InverseProperty(Cast)]
    public virtual Movie Movie { get; private set; }

    public string Name { get; set; }

    [Key]
    public int Id { get; private set; }
    }

    public class Person
    {
    public string Name { get; set; }

    [Key]
    public int Id { get; private set; }

    private HashSetRole _PlayedRoles;
    [InverseProperty(Actor)]
    public virtual ISetRole PlayedRoles // I want this to return a readonly-Set
    {
    get
    {
    if (_PlayedRoles == null)
    {
    _PlayedRoles = new HashSetRole();
    }
    return _PlayedRoles;
    }
    }

    internal void AddPlayedRole(Role role)
    {
    PlayedRoles.Add(role);
    }
    }br/br/
    public class MovieContext : DbContext
    {
    public DbSetMovie Movies { get; set; }
    public DbSetPerson Persons { get; set; }
    public DbSetRole Roles { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
    modelBuilder.Conventions.RemovePluralizingTableNameConvention();
    }
    }
    br/

    DB:3.12:How To Use Readonly Collections With Code Only cs

    I found a solution for the empty collection issue in another recent thread in this forum

    http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/965d4881-a992-45cb-bfb5-0e0fb47d8704/#a2da85b1-7c27-4637-bda3-766fb3be219a. I have to load the collection explicitly because lazy loading is only possible when the property is
    public virtual (see
    http://msdn.microsoft.com/en-us/library/dd468057.aspx).

    foreach(varitemin categories)
    {
    db.Entry(item).Collection(c = c.Products).Load();
    }

  • RELEVANCY SCORE 3.12

    DB:3.12:When Does A Superclass' Methods Get Resolved By Javassist? 8z



    I have an existing class that I want to use as a superclass for a new class definition.

    CtClass ctNewHandlerClass = ClassPool.getDefault().makeClass(newClassname, ctExistingClass);

    Something troubling is that this new ctClass has none of the inherited methods in ctExistingClass. In other words:

    LOG.info("class methods are ", Arrays.toString(ctNewHandlerClass.getMethods()));

    ... returns an empty array. When does javassist resolve the superclass' methods?

    DB:3.12:When Does A Superclass' Methods Get Resolved By Javassist? 8z


    I have an existing class that I want to use as a superclass for a new class definition.

    CtClass ctNewHandlerClass = ClassPool.getDefault().makeClass(newClassname, ctExistingClass);

    Something troubling is that this new ctClass has none of the inherited methods in ctExistingClass. In other words:

    LOG.info("class methods are ", Arrays.toString(ctNewHandlerClass.getMethods()));

    ... returns an empty array. When does javassist resolve the superclass' methods?

  • RELEVANCY SCORE 3.11

    DB:3.11:Help With Reducing Try Catch Blocks dk


    Hi,
    I have an object of a class having about 100 get methods. I have about 300 such objects. I want to get all the parameters from all the 100 get methods for all the objects, and for each failed get methods, an exception occurs,
    Now I can loop from - to no of objects but inside I have to declare 100 try catch methods for each get methods.

    for(i=0;i 300;i++) {
    try {
    a.getname;
    }
    catch { --- }

    try{
    a[i].getno ;
    }
    catch { -- }
    .
    .
    .
    100 such a[i].getXYZ methods
    any alternative. wanted to avoid all the try catch statements
    Please suggest
    thanks

    DB:3.11:Help With Reducing Try Catch Blocks dk

    tarkesh wrote:
    Its actually a serialized object, which I am trying to extract parameters from. So I actually need to know exactly which get method is failing for which object, as the objects can be in error when they get transported over the network.If it was me I would generate the code so the actual mechanism becomes moot.

    But you can use something like the following (generated or not.)

    String attrName="Unknown"
    try
    {
    attrName = "attr1";
    attr1=instance.attr1;
    attrName = "attr2";
    attr2 = instance.attr2;
    }
    catch(Exception e)
    {
    // attrName has correct name here.
    }

  • RELEVANCY SCORE 3.11

    DB:3.11:Help With A Problem a1


    I am trying to solve this problem and cant get it to work. This is the question as it was given to me.......
    Write a program that displays an invoice of several items. It should contain the item name, quantity, price, and total cost on each line for the quantity and item cost. Use two classes. The first class contains the item data and methods to get and set the item name, quantity, and price. The other class creates objects for the items and use objects to call the set and get methods

    DB:3.11:Help With A Problem a1

    On the assumption that this is a homework question, it is customary to post the code you have written so far, and say where you are having difficulties.

    So we need to see more before we can help you...

  • RELEVANCY SCORE 3.11

    DB:3.11:Abstract Class With Set And Get Methods p1


    hi

    how to write set and get methods(plain methods) in an abstartc class

    ex: setUsername(String)

    String getUsername()

    and one class is extending this abstract class and same methods existing in that sub class also..... how to write......plz provide some ideas

    am new to programming....

    asap
    thnx in advance

    DB:3.11:Abstract Class With Set And Get Methods p1

    i have 2 classes one is
    s abstract class without abstract methods.. then why have decided to make it abstract????

  • RELEVANCY SCORE 3.10

    DB:3.10:Extensions/Method Access cm


    right. i have a class "1" which extends an abstract class "2" which extends an abstract class "3." hence, class "1" implements all methods in classes "2" and "3" along with a few of its own. the constructor in a fourth class, is parsed a new instance of class "1" (of type "class 3"), how can i access all the methods in class "1" using this fourth class? i have tried using for example:

    instancename.but the only methods i can access are the ones in the super class (i.e. class "3"

    DB:3.10:Extensions/Method Access cm

    hi keith!

    cant believe i was actually able to make sense of that but it worked!

    thanks!

  • RELEVANCY SCORE 3.10

    DB:3.10:Avoiding Case-Sensitivity During Reflection Calls 3j


    Hi All,

    I am reflecting methods from an object using java.lang.reflect.* classes and trying to invoke methods on the object. The problem is, I am aware of the filed names in the class that is reflected. The setter method name is not known exactly. They appear something like setfiled name. Is there a way to avoid case sensitivity while trying to look up for methods from the class.

    Any early help is highly appreciated.

    Thanks
    Varaga

    DB:3.10:Avoiding Case-Sensitivity During Reflection Calls 3j

    You may also find java.beans.Statement and Expression useful:

    public class CrappyBean {
    private int value;

    public void makeValue(int value) {
    this.value = value;
    }

    public int findValue() {
    return value;
    }
    }import java.beans.Statement;
    import java.beans.Expression;

    public class StatementUse {
    public static void main(String[] args) throws Exception {
    CrappyBean object = new CrappyBean();
    Statement setter = new Statement(object, "makeValue", new Object[]{17});
    Expression getter = new Expression(object, "findValue", null);

    setter.execute();
    System.out.println(getter.getValue());
    }
    }

  • RELEVANCY SCORE 3.10

    DB:3.10:Re: Can't Get Simple Anonymous Class To Work pz


    Ok, I guess the quoted paragraph I posted was wrong by saying you could "add" methods to the class name listed after 'new' in the anonymous class definition. As an exercise, I was trying to rewrite an inner class in an anonymous class statement, but that doesn't seem to be possible. I thought I could just eliminate the inner class completely and create an Object object with the methods I wanted.

    DB:3.10:Re: Can't Get Simple Anonymous Class To Work pz

    It seems rather pointless for this example, butpublic void showCalculations() {
    new Object() {
    public void showLow() {
    int low_num = numbers[0];
    for(int i=1;inumbers.length;++i) {
    if(numberslow_num) {
    low_num = numbers[i];
    }
    }
    System.out.println("low: " + low_num);
    }
    }.showLow();
    }

  • RELEVANCY SCORE 3.10

    DB:3.10:How To Call A Method That Takes Inherited Class As Parameter? af


     Hi, I have a base class and some classes are inherited from it. I created some overloaded methods that takes those classes as parameters. In a method I only get an instance of the base class whose type is one of its descendant. How can I call it in an easy way? (not creating a Dictionary of inherited classes with values of Type etc.) Here is an example:class BaseClass{}class InheritedA:BaseClass{}class InheritedB:BaseClass{}methods:void DoSthing(InheritedA inst){}void DoSthing(InheritedB inst){}My calling code:private void Method1(){BaseClass inst=new InheritedA(); //cannot change the way it is givenDoSthing(inst as ???? ) //I don't know what to insert here: inst as inst.GetType().Name? I really need the instance's class type}Probably there is an easy way I just don't get it now :)

    AndrisAndris

    DB:3.10:How To Call A Method That Takes Inherited Class As Parameter? af

    Hi,Yes, I know that this forum isn't for that type of question I asked but as I noted in the other duplicate of this message (which ended up in the Sandbox thread), I was unable to set the location of the thread I liked to put this question in (General C# forum) as only 10-12 forums were presented in the listbox (I could put it into Interop, Sandbox, High Capability Systems, Windows Server programming for something, how to create a hybrid car from milk bottles thread etc. :) but the regular forums cannot be found. Can you tell me how could I put it there?Andris

  • RELEVANCY SCORE 3.10

    DB:3.10:Swapping Out Superclass With Class Of Same Pkg, Name, Methods? fc


    Hey there. Consider two classes with the same package, same name, and same methods (params included). Let's call these classes Class A1 and Class A2. Secondly, consider a class, Class X, that extends Class A1. The class loader will only have contain Class A1 or Class A2. Could I replace Class A1 with Class A2 without interruption? I've tested this scenario with success. But, does this violate the JL or VM specs? Could behavior be different across JVMs? Other issues?

    Thanks.

    -Chris

    DB:3.10:Swapping Out Superclass With Class Of Same Pkg, Name, Methods? fc

    Tell me if I understand this question correctly: You have built Y, A1, and X in the same compilation environment, and you know that JVM1 runs them correctly. Now you want to run JVM 2, loading Z, A2, and X. Since X's classfile is not recompiled specifically for Z and A2, you want to know what guarantees apply.

    If it were C++ instead of Java, few if any would apply, since the C++ compiler routinely incorporates information from Z and A2 into the binary of X, in analogous situations.

    In Java, you should be all right. You are right in emphasizing that the package, class, and method sets are compatible. The method signatures should be identical also.

    The only thing Java compilation inlines are constants (final member variables with constant initializer expressions). If Z, Y, A[12] do not export constant definitions, you should be fine.

    Here are some documentation links that give the details:

    JLS 13, Binary Compatibility:
    13.4.4 Superclasses and Superinterfaces
    http://java.sun.com/docs/books/jls/third_edition/html/binaryComp.html#13.4.4

    13.4.9 final Fields and Constants
    http://java.sun.com/docs/books/jls/third_edition/html/binaryComp.html#13.4.9

  • RELEVANCY SCORE 3.10

    DB:3.10:Important Ques About Class Interface... ka



    Hi all,

    Please answer these questions about class interface (t-code) se24...

    When you see interface CX_SY_CONVERSION_NO_NUMBER and click on the method tab then there are some methods which are listed in blue and the last one CONSTRUCTOR is not in blue why?

    ques 2) why is the first method enclosed in ?

    ques 3) how do you use a class interface in your programs?

    ques 4) classes have interfaces and methods of the same name..Why? It is confusing me? What is the difference between an interface and a method? Why do we need interface when we have classes and methods?

    Thanks

    Charles.

    DB:3.10:Important Ques About Class Interface... ka


    Charles,

    Do you have any Idea on Abstarct classes in JAVA?.Interfaces are also Just like Abstarct classes.

    Methods which are more frequently using will keep in one interface.So we will have reusability of methods.We can not create object for that.

    Pls. mark if useful.

  • RELEVANCY SCORE 3.10

    DB:3.10:"Class Not Found" While Deploying z3



    Have anybody had the same problem?While deploying an jar I get the message:Bean : SystemControlBeanSection: 22.2Warning: The Bean Provider must specify the fully-qualified name of the Java class that implements the enterprise bean's business methods in the ejb-class element.Info : Class not found: com.xxx.yyy.zzz.SystemControlBeanThe class is definitely in the jar and at the correct place. I do not understand that!

    DB:3.10:"Class Not Found" While Deploying z3


    Good practice:put everything in the deploy directory, as ioparra told you. I would suggest another way: deploy an ear with all your jars. Use the Class-Path of the manifest of your ejb jar.Greetings,Frito

  • RELEVANCY SCORE 3.09

    DB:3.09:Implement The Storage And Retrieval Of Object Descriptors pd


    I need to get the name of a class, methods etc from the console and then some how store them and then retrieve ... them...

    the user can enter
    employee
    {
    int id;
    String name;
    printMe();
    }

    DB:3.09:Implement The Storage And Retrieval Of Object Descriptors pd

    THought this might help you

    http://forum.java.sun.com/thread.jsp?forum=62thread=444118tstart=15trange=15

  • RELEVANCY SCORE 3.09

    DB:3.09:Unable To Create Extension Methods In Interactive Mode mz


    If you attempt to create an extension method in interactive mode, you'll get aerror CS1109: Extension methods must be defined in a top level static class; MyExtensions is a nested class error message.

    This effectively means extension methods cannot be created in interactive mode, since all classes in interactive mode are nested classes of the top level Script class.

    I think this rule should be relaxed for interactive mode and extension methods should be allowed directly in the top level Script class and in nested classes of the top level Script class.

    DB:3.09:Unable To Create Extension Methods In Interactive Mode mz

    Yes, we have a plan to allow top-level extension methods in script, but we haven't got there yet.-- Kevin Pilch-Bisson kevinpi@microsoft.com

  • RELEVANCY SCORE 3.09

    DB:3.09:Abap Object Generator/Converter fs



    Has anyone come across a function module or class-method that will create, define and build a ABAP Object Class?

    Inbound interface would need to include the basics of the Class definition (e.g., class name, supertype, methods, functions to convert to methods ...)

    Regards,

    Jay

    DB:3.09:Abap Object Generator/Converter fs


    Hi,

    I havent tried this FM, but i think this should do the job.

    SEO_CLASS_CREATE_COMPLETE

    Regards

    Raja

  • RELEVANCY SCORE 3.09

    DB:3.09:Type="Class" In The Jsp:Usebean Tag jz


    Hi every one
    I create a class named quiz containing four Strings question,answer1,answer2,answer3
    I initialize them in the constructor.
    I made four get methods ...getQuestion(), getAnswer1 ...and so on.
    I made the class implement the serializable interface.
    in the main i created an object of that class and stored it on a file with .ser extension and i do the following in the jsp page
    jsp:useBean id="anyID" BeanName="name of the .ser file" type="className--i put the class name--"/
    but he gives me classnotfoundexception for the classname in the type field.
    what can i do?
    thnx in advance.

    DB:3.09:Type="Class" In The Jsp:Usebean Tag jz

    what can i do?Make sure that the class "quiz" is available to your web app.
    Should be under the web-inf/classes directory (in its package directory)

    Regarding your Quiz class:
    - It must be in a package
    - Also that it has a public noargs constructor:
    package myPackage
    public Quiz(){
    }This class file should be in web-inf/classes/myPackage/Quiz.class

    Hope this helps,
    evnafets

  • RELEVANCY SCORE 3.09

    DB:3.09:Reflection 1m


    Hi there,

    I know this topic should not be in this forum, but this forum is checked a lot so chances are higher someone knows the answer...

    I have two questions related to reflection. I have a small program which reads in the methods of a class. The class read in is a JPanel (it extends from JPanel). It has a JList added, and an inner class registered for ListSelectionEvents (of the JList).
    The skeleton class looks like this:

    package gui;

    public class WorkAreaGUI extends JPanel {

    private JList list;

    public WorkAreaGUI() {
    .....
    list.addListSelectionListener(new ListSelectionHandler());
    }

    class ListSelectionHandler implements ListSelectionListener {

    public void valueChanged(ListSelectionEvent evt) {
    .....
    *** work on JList here ***
    }

    }

    }When I read in the methods of this class, by using classObject.getDeclaredMethods(); I get a few weird looking methods I cannot identify where they come from to name (types filtered):

    static javax.swing.JList access$1(gui.WorkAreaGUI)
    static javax.swing.JList access$3(gui.WorkAreaGUI)Apparently they have something to do with the JList and access from the inner class to the JList. But I do not know why those methods are generated and the more based on what are they generated? And are the names always 'access$X' (where X is a number)? I am not interested in those methods, so can I filter them out by checking on the $ sign in the name? I hope someone can tell me more about this!

    The second question I have is: When fetching for example parameters of a method, besides finding the type (boolean, int, Object etc) is it possible to fetch the real name of the parameter as it was programmed by the programmer in the source (assuming it was compiled by a standard compiler)? So for example:

    void doSomething(int value) {

    }So to retrieve the name: value

    I hope someone can help me out with these questions, I would highly appreciate it!

    Martijn

    DB:3.09:Reflection 1m

    Hi there,

    I know this topic should not be in this forum, but this forum is checked a lot so chances are higher someone knows the answer...

    I have two questions related to reflection. I have a small program which reads in the methods of a class. The class read in is a JPanel (it extends from JPanel). It has a JList added, and an inner class registered for ListSelectionEvents (of the JList).
    The skeleton class looks like this:

    package gui;

    public class WorkAreaGUI extends JPanel {

    private JList list;

    public WorkAreaGUI() {
    .....
    list.addListSelectionListener(new ListSelectionHandler());
    }

    class ListSelectionHandler implements ListSelectionListener {

    public void valueChanged(ListSelectionEvent evt) {
    .....
    *** work on JList here ***
    }

    }

    }When I read in the methods of this class, by using classObject.getDeclaredMethods(); I get a few weird looking methods I cannot identify where they come from to name (types filtered):

    static javax.swing.JList access$1(gui.WorkAreaGUI)
    static javax.swing.JList access$3(gui.WorkAreaGUI)Apparently they have something to do with the JList and access from the inner class to the JList. But I do not know why those methods are generated and the more based on what are they generated? And are the names always 'access$X' (where X is a number)? I am not interested in those methods, so can I filter them out by checking on the $ sign in the name? I hope someone can tell me more about this!

    The second question I have is: When fetching for example parameters of a method, besides finding the type (boolean, int, Object etc) is it possible to fetch the real name of the parameter as it was programmed by the programmer in the source (assuming it was compiled by a standard compiler)? So for example:

    void doSomething(int value) {

    }So to retrieve the name: value

    I hope someone can help me out with these questions, I would highly appreciate it!

    Martijn

  • RELEVANCY SCORE 3.09

    DB:3.09:$Classes Produced By Compiler 9d


    Greeting.
    I tried looking for this topic on the FAQ and various tutorials but I couldn't find it.

    When I compile an application, I get a .class file with the same name as my primary class and some variable number of "$n" suffixed class files. For example, I have an application that does a least squares fit to some x,y pairs of data. My source file is called, lsFit.java. In that file, I have a public class, lsFit, that contains my constructor, main, error handling, and calculation methods. I also have a canvas class, rrCnvs, that overrides canvas and holds my graphics. When I compile lsFit.java, I get: lsFit.class, lsFit$1.class, lsFit$2.class, and rrCnvs.class. With other applications, I get varying amounts of $n classes and I can't figure out what the compiler bases these classes on. Can someone tell me?

    DB:3.09:$Classes Produced By Compiler 9d

    Btw, please, pleeeeease read the naming conventions before you hand out your code to other people.

  • RELEVANCY SCORE 3.09

    DB:3.09:Re: Reflection On Static Methods x8


    It is possible to use the Class class to convert a
    string into the string-value's class and use it's
    methods. IE: String = HashMap - get an HashMap
    object.Huh? You can use Class.forName() to load a class with a certain name, stored in a String. And then you can use Reflection to find and invoke the methods, yes.

    I retrieve a string containing a class name and a
    method name. However, the method is a static method.
    Is there a java class out there that will allow me to
    make static method calls using reflection if i know
    both the class and method names?http://java.sun.com/docs/books/tutorial/reflect/index.html

    DB:3.09:Re: Reflection On Static Methods x8

    Don't ressurect old threads. It's about 2 years old. I'm locking this zombie.

    Kaj

  • RELEVANCY SCORE 3.08

    DB:3.08:Swapping Out Superclass With Class Of Same Pkg, Name, Methods? k9


    Hey there. Consider two classes with the same package, same name, and same methods (params included). Let's call these classes Class A1 and Class A2. Secondly, consider a class, Class X, that extends Class A1. The class loader will only have contain Class A1 or Class A2. Could I replace Class A1 with Class A2 without interruption? I've tested this scenario with success. But, does this violate the JL or VM specs? Could behavior be different across JVMs? Other issues?

    Thanks.

    -Chris

    DB:3.08:Swapping Out Superclass With Class Of Same Pkg, Name, Methods? k9

    The consequences are either:

    (a) it works perfectly, or

    (b) there is something incompatible about the re-implementation in the replacement class which causes the application to fail or misbehave, or

    (c) the replacement class doesn't exactly match the signature of the replaced class, in which case you will get an Exception or an Error.

  • RELEVANCY SCORE 3.08

    DB:3.08:Gettype Base Class 9s


    I had  created an abstract  class which had inherited from the Dataset class,i had created  many  derived classes  which inherit from the  abstract class.I pass these classes as byref parameters for my methods and i am creating a rulethat all the byref must be a type of dataset
    when i used  public override ProblemCollection Check(Parameter parameter)
    and tried for parameter.Type.Name    i get the   full name of the class and the basetype is returned as null,
    i also tried  parameter.Type.IsAssignableTo(FrameworkTypes.DataSet) which returns as false,how do i proceed to create this rule...
    would appreciate any help..thanks
     

    DB:3.08:Gettype Base Class 9s

    Thanks you Jeffery,works good
     
     

  • RELEVANCY SCORE 3.08

    DB:3.08:Convert String To Type ap


    Hello, lets say I have a class named Myclass in my program and I want to create an instance of this class during runtime but I know only name of the class. So  I need first to convert string Myclass to type Myclass and then create an instance of class My class. How can I do that? I know that I can use Gettype method to convert string to type but how do I then create instance of that type and call its methods and/or access methods? Thanks

    DB:3.08:Convert String To Type ap

    MyClass mc = (MyClass)Activator.CreateInstance(Assembly, myclass);

  • RELEVANCY SCORE 3.08

    DB:3.08:Java Class z3


    I have a programming project that i do not understand. I have to define a class called Student. Each student has a name, a count of exams, and an average in those exams. The count starts at zero. The class should have three methods(getName,getAverage,and AddTest.)

    This is what i have so far:

    class Student
    {
    public Student(String n, double e, double a)
    {
    name = n;
    exam = e;
    average = a;
    }
    public String getName()
    {
    return name;
    }

    However I do not understand how to get the average or add the test.

    DB:3.08:Java Class z3

    Crayola,

    Look at collections to hold the test scores (ArrayList or Vector objects).

    To get the average add all the values in your collection of test scores and divide by the total size of your collection.

    gl

    kimoS

  • RELEVANCY SCORE 3.08

    DB:3.08:Object Orinted Progamming 11


    Hi Its a basic question, I am little confused though,
    I got class A and B. Class B extending from A. Class A is having a private variable and public methods to access it.
    When I create an object of B with refeence of A and calling the method of A. what is happening? My understanding is Class B will get all the public and protected methods from class A if it is so what will happend to private variable in A with public methods.

    please give an answer.

    pj.

    DB:3.08:Object Orinted Progamming 11

    See in ur case though u have base class variables
    private but you have exposed them through public
    methods, so anybody can access them so as your
    subclass can access it .If I call setX within the setX method in B the method will call itself recursively because of the scope rules. I might want to do that but if I rather want to call setX of A I have to use the super keyword and do super.setX.

  • RELEVANCY SCORE 3.08

    DB:3.08:Getting Type And Name Of Parameters Retrieved By Roundenvironment cx


    In the following code the annotation processor gets methods annotated; i need, for each method, to save type and name of parameters.
    I read that i could use reflection, but to use it i need a class for input, while, here, i have only his methods. So i tried to get the enclosing element
    of the methods but i don't know how to proceed. Thank for your help.

    //get methods annotated with @MyAnnotation annotation
    for (Element e : roundEnv.getElementsAnnotatedWith(MyAnnotation.class))
    {
    //get enclosing class, that contains the annotated methods
    TypeElement clazz = (TypeElement) e.getEnclosingElement();

    // now i'd like to obtain Method objects, from wich get paramters type and names
    // how can i do?
    }

  • RELEVANCY SCORE 3.07

    DB:3.07:Re: What Is The Difference Between ? New Operator And Class.Forname() ??? ss


    Class.forName(), takes the class name as parameter,
    and loads that class in memory. But it doesn't create
    any instance of that class.
    That means static methods/variables are available for
    use.

    new keyword, checks if the class is loaded, if not
    then loads that class, and then creates an instance
    of that class.Class.forName actually returns the class object for that name (class - for -name). it might load it, if the class hasn't already been loaded, but it's misleading to say that's what that method does

    your definition of 'new' is wrong, too. give the dukes back

    DB:3.07:Re: What Is The Difference Between ? New Operator And Class.Forname() ??? ss

    vicky_gulhane wrote:
    Hi,

    new operater returns the instance of a class.

    and Class.forName is search the exting same class name.You're three days early, this thread's birthday isn't until Thursday. Besides, I think it's already got a chunk of misinformation, you'll have to think of another present

  • RELEVANCY SCORE 3.07

    DB:3.07:Deprecated Types Methods kc


    Is there place where I can get the list of deprecated types and methods?
    I found the following link - http://code.msdn.microsoft.com/sps2010deprecated/Release/ProjectReleases.aspx?ReleaseId=3304
    But the list does not display the class name, so it is difficult to use that list.

    Vijay

    DB:3.07:Deprecated Types Methods kc

    Both the SP2010 lists on the link you provided give the class name = its next to the title Type e.g:
    Namespace: Microsoft.SharePoint.Administration, Type: SPFarm, Method: Migrate, Message: Gradual Upgrade is not supported in the current version of SharePoint.
    Namespace: Microsoft.SharePoint.Administration, Type: SPFarm, Method: Migrate, Message: Gradual Upgrade is not supported in the current version of SharePoint.
    Namespace: Microsoft.SharePoint.Administration, Type: SPFarm, Method: Open, Message: Use the SPFarm.Open method that takes a passphrase.
    The Class name is SPFarm, the Method name is given also - so you can find its exact location in the APIRead my wiki at www.intheknow.it for more code and tips for developing with SharePoint 2007 2010
    Twitter: @starznet

    Technical Architect at Starznet Ltd. WSS/MOSS development and customisation with a primary focus on CMS.

  • RELEVANCY SCORE 3.07

    DB:3.07:Javax.Faces.El.Evaluationexception: More Than One Method Mat d3



    Hi.I run into one problem when I use overridden methods in a class that extends from a parameterized class. If I declare in the superclass one method, then I override such method in the specific type subclass, and then I use this method as an action, I get this exception:

    javax.faces.el.EvaluationException: More than one method matched #{userAction.select(userItem)}. Method name or number of p
    arams must be unique.

  • RELEVANCY SCORE 3.07

    DB:3.07:How To Get The Methods From Exe File. 7k


    I have an created an exe file for the java classes , what I want to do is load that exe and I have to calll a method of that loaded exe file which includes the class file and I have to call the methods from that exe file.

  • RELEVANCY SCORE 3.07

    DB:3.07:Calling Methods In Bean/Servlet From Another Bean/Servlet 73


    This is sort of a beginner problem.
    I have a web app and haven't figured out how to call methods in a bean from another bean. In my last project I just had one bean full of helper methods that were used quite a bit. Now I'd like to get a little more object oriented, more abstracted, however you want to look at it, and split like things into their own classes, such as database operations all in one class, other stuff in another class... etc. That way my code is more reusable and some could be used in future projects easily.

    I know (since CS 125) you can call a method in one class from another class.

    blah = class1.method1(arg_from_a_class2_method);

    Also you can call methods in a bean from a JSP if you have a jsp:useBean ... the same way.

    I've tried including the package name as well in the method call.

    Now I've been reading that you have to create a new instance of the class to use the methods on, but I just want to use the methods old school style like my first example, give an argument, do something, and return a result. I should be able to do this.

    Is my thinking all wrong to begin with or what? Any help is appreciated.

    M

    DB:3.07:Calling Methods In Bean/Servlet From Another Bean/Servlet 73

    I don't want an instance of this class. This is just a utility class with static methods. Example: One method will take a String query and String dbname and do a query returning a ResultSet.

    It's a convenient abstraction to have this in another class and I can reuse the class in a future project.

    How do I call this method from within my bean that talks to the JSP?
    The bean and the utility class are both in the same directory and same package and I still get "cannot find symbol" errors when I compile.

    Thank you for any help.

  • RELEVANCY SCORE 3.07

    DB:3.07:Re: Is It Good Habit To Use "Instanceof" p1


    Can you explain me why is this valid ?

    interface BaseClassLambda {
    Object apply (CT ct) ;
    Object apply (CS cs) ;
    }I read that interface is a sequence of abstract
    methods without definition.It's valid because it's a sequence of abstract methods without definition (that is, without implementation). That's what an interface is--it lists what methods an implementing class must have, but it's up to the implementing class to fill in the body (the implementation).

    And what hell is that too ?

    static final BaseClassLambda sqlStringBuilder =
    new BaseClassLambda ()Sorry my english.That's an anonymous inner class. It's a class that implements that interface defined inside the context of another class, and that implementing class has no name. Look up "anonymous inner class" in your textbook or tutorial, or google for it for details.

  • RELEVANCY SCORE 3.07

    DB:3.07:Casting Using The Class Class ca


    Hello,

    I would like to create an instance of a class using a String containing the class name, and then to be able to access the methods of that class through that instance. So far I've got:
    var = (Class.forName("ClassName").newInstance()).methodInClass();But get a "Cannot find method: methodInClass() in class Object" type compilation error.

    How can I cast my instance correctly?

    Thanks,
    N

    DB:3.07:Casting Using The Class Class ca

    For this use of newInstance to be useful:

    1 the string must be calculated (say read from a
    file) -- but I'm assuming it's not, only for the sake
    of brevity
    2. The class you're actually instantiating can't be
    hard-coded into the code --
    otherwise what's the point: this is why I mentioned
    casting it to a common
    interface, for example.I have situation number 2.
    I had the "why" and "what", just not the "how".

    Thanks for the help.

  • RELEVANCY SCORE 3.07

    DB:3.07:Extending Classes And Overriding Methods m9


    If I have a class which extends another, and overrides some methods, if I from a third class casts the extending class as the super class and calls one of the methods which gets overrided, is it the overrided method or the method of the superclass which get executed?

    Stig.

    DB:3.07:Extending Classes And Overriding Methods m9

    Ya... I checked it for my self now with my own classes. After some trouble finding every constructor which should create an instance of the extending class. But it works fine.

    Thanks everyone.

  • RELEVANCY SCORE 3.07

    DB:3.07:Private Methods 7x


    What is the use in declaring a variable as private . Because if the user has to modify the variable we have to provide the user with get and set methods .

    He will declare an Object of that class and calls set /get methods. Instead we could have declared that variable as public and allow him to change directly?
    How are we achieving "Data Hiding" from this?

    DB:3.07:Private Methods 7x

    private is simply an access modifier.It's good programming practice to keep class attributes (variables) only visible in the class and provide getters and setters as the only way to reach these variables.
    Also, the getters and setters (and other public methods) make the API (or just interface) that clients would adhere to. As long as that interface does not change, you can change stuff inside the class (including private variables) all you want and clients wouldn't care.

  • RELEVANCY SCORE 3.06

    DB:3.06:Types Of Methods sz


    What are class methods and instance methods? What are the differences between the two?

    DB:3.06:Types Of Methods sz

    linuxisbest.eric wrote:
    OK thanks. I'll do that next time. Guess I might be wasting some people's time by posting here about things i just have to google.Yeah, a lot of these basic "What does X mean?" or "What's the difference between X and Y?" questions have been asked and answered a squillion times. People here are happy to help if you've done some initial work and research on your own and just get stuck, but we generally don't want to just regurgitate what's readily available with a few minutes' investigation.

    Good luck with your studies!

  • RELEVANCY SCORE 3.06

    DB:3.06:C# Utilities Functions In Other Script zp



    Create a static class, with static methods...

    public static class Tools
    {
    public static float Map(float s)
    {
    // TODO : your code here...
    }
    }



    To call it, reference the class name and the method...

    float temp = Tools.Map(10);



    You have to make it static or you must create an instance of the class and have a reference to that in order to call non-static methods.

    DB:3.06:C# Utilities Functions In Other Script zp


    Create a static class, with static methods...

    public static class Tools
    {
    public static float Map(float s)
    {
    // TODO : your code here...
    }
    }



    To call it, reference the class name and the method...

    float temp = Tools.Map(10);



    You have to make it static or you must create an instance of the class and have a reference to that in order to call non-static methods.

  • RELEVANCY SCORE 3.06

    DB:3.06:Problems Deploying Jcorba Objects m7


    --
    I am having problems in deploying JCORBA application on the OAS
    (4.0). I have a Customer class and a CustomerRemote class that
    exposes some methods of the Customer class. During deployment, I
    get an error that says "Customer class should be public and
    final". Why is this? Any help would be greately appreciated.

    Sincerely
    Sam
    null

    DB:3.06:Problems Deploying Jcorba Objects m7

    --
    The explanation is simple.

    In order to create an Object of any class,
    You must have the appropriate privilage
    to call a constructor (public, Protected, private).

    Depending on the source of the call, the
    correct privilage is required, for your
    case, it would be public.

    Also, since you are trying to create an object
    on the middle tier, you need to call some API
    which creates the object for you - that is
    without an initial object type.
    Java handles this problem by having
    static methods (do not get a this parameter!)

    Thus putting all the requirements together,
    you need to have a public class with a
    static (public) method to invoke to create an
    object of that class.
    This technique is used in many situations including
    classes which reside on the same tier.
    null

  • RELEVANCY SCORE 3.06

    DB:3.06:Re: Array Proj Help ca


    This thread will go way too long. let me give you an easy way try to make another class by the name of ScoreTester and should have all the method determineSatisfactory, etcc,, blah blah. After that create an object in your Scores class and call those methods.

    DB:3.06:Re: Array Proj Help ca

    I used printF statements so that my output would line up underneith each other but when I compile and excute my output runs together how could I fix this

    import javax.swing.*;

    /* Assignment 9
    Author:
    SC01
    */
    public class Scores {

    private final static int SIZE = 25;

    public static void main(String[] args) {

    int [] scores = new int[SIZE];
    int count = 0;
    double average = 0.0;

    count = loadArray(scores);
    average = determineAverage(scores, count);
    displayResults(scores, count, average);
    System.exit(0);
    }

    private static int loadArray(int[]n) {
    int count = 0;
    int score = Integer.parseInt(JOptionPane.showInputDialog("Input text press Enter(-1 to end)"));
    while(count SIZE score != -1){
    n[count] = score;
    count++;
    score = Integer.parseInt(JOptionPane.showInputDialog("Input text press Enter (-1 to end)"));

    }
    return count;
    }

    private static void displayResults(int[] n, int cnt, double ave) {

    int i;

    for(i = 0; i cnt; i++) {

    System.out.println();}
    System.out.printf("THE NUMBER OF OUTSTANDING SCORES %11d", determineOutstanding(n,cnt));
    System.out.printf("THE NUMBER OF SATISFACTORY SCORES %11d", determineSatisfactory(n,cnt));
    System.out.printf("THE NUMBER OF UNSATISFACTORY SCORES %11d", determineUnsatifactory(n,cnt));}

    private static int determineOutstanding(int[] n, int cnt) {
    int outstanding = 0;
    int j;
    for(j = 0; j cnt; j++) {
    if(n[j] = 90)
    outstanding++;
    }
    return outstanding;
    }

    private static int determineSatisfactory(int[] n, int cnt) {

    int satisfactory = 0;
    int i;
    for(i = 0; i cnt; i++) {
    if (n[i] = 60 n[i] 90)
    satisfactory++;
    }
    return satisfactory;
    }

    private static int determineUnsatifactory(int[] n, int cnt) {
    int unsatisfactory = 0;
    int i;
    for(i = 0; i cnt; i++) {
    if (n[i] 60)

    unsatisfactory++;
    }
    return unsatisfactory;
    }

    private static double determineAverage(int[] n, int cnt) {
    double Average = 0.0;

    return Average;
    }

    private static int determineAboveAverage(int[] n, int cnt, double average) {
    return(0); // so file compiles
    }

    private static int determineBelowAverage(int[] n, int cnt, double average) {
    return(0); // so file compiles
    }

    private static int determineHighest(int[] n, int cnt) {
    return(0); // so file compiles
    }

    private static int determineLowest(int[] n, int cnt) {
    return(0); // so file compiles
    }}

  • RELEVANCY SCORE 3.06

    DB:3.06:Static Abstract Inner Classes p9


    Sorry to sound stupid, but why would a class be static? I've encountered an example of an abstract static inner class and I'm not sure why it's static. Static methods I understand -- they are methods of the class and not the instance. So then, can someone explain to me a static class?

    Thanks,

    Erik

    DB:3.06:Static Abstract Inner Classes p9

    inner classes cannot be instantiated outside of object
    methods in the class, whereas static inner classes can
    be created anywhereThis is incorrect.
    Inner classes can be instantiated from anywhere that they are visible - if you declare an inner class public (inside a public class), and provide a public constructor, then it can be instantiated from anywhere.

  • RELEVANCY SCORE 3.06

    DB:3.06:Please Help fs


    i am new to java can someone help me to write this that follows

    The first class is FField
    This class should have attributes name and value.
    This class should have get set methods for name and value.

    The next class is FMessage.
    Has attribute name (the name of the message).
    This class should contain a map (named values) of FField objects.
    This class should implement set and get methods for setting and getting field values.

    The above two classes should be in a package called efix.

    A calling program (class FTest) should be able to do the following

    msg = new FMessage("Order"); // create a FIX message named "News"
    msg.setField("OrderID", new FField("OrderID", "12345"));
    msg.setField("xxx", new FField("xxx", "XXXXXX"));

    System.out.println(msg.getField("OrderID"));
    ---------------
    i would rteally appreciate someones help.

    DB:3.06:Please Help fs

    thanks a lot for your message. that how it was suppose to be done, may be for reuse.

  • RELEVANCY SCORE 3.06

    DB:3.06:Hiding, Encapsulating, And Free Show xk


    Is this correct about Java?
    Accessibility modifiers are ?public, protected, private, static, final?.
    There is no other way to make a field in an inner class changeable at any
    time by methods of the inner class, yet read-only by the containing
    class, except through using the customary ?get? kind of methods and
    private accessibility.
    Is this correct, incorrect, or in need of slight modification?

    DB:3.06:Hiding, Encapsulating, And Free Show xk

    Thanks for the education.
    Herko gave a useful reply and seemed to know what I asked.
    Yes, that is the point: that I can?t think of a word better than
    accessibility to include final along with access modifiers which in
    turn has been technically reserved in Java to a restricted meaning.
    ?field modifiers? is too general and inclusive.
    ?final? does modify accessibility.
    It is a weaker case to call ?static? an access modifier.
    It seems to me like I was the one being too polymorphic for you.

  • RELEVANCY SCORE 3.06

    DB:3.06:Class Methods Throught Reflect p7


    Is it necessary to execute the Class.getMethods() method to retrieve the methods with a certain name?

    For example :
    public class XPTO{
    public void test(int i){}
    public void test(String str){}
    public void test(long l){}
    }I just need the test methods, but the getMethods() returns besides the looked for methods, also the inhereted methods and other defined methods in the actual Class.

    In this case the class just has a couple of methods, now lets imagine a javax.swing.JComponent subclass... with more implemented methods in it.
    Well you may say it fast to process a search, or filter for the methods, but lets imagine that it's necessary to process this type of action for thousands of Class's (a little extremist?!? Maybe).

    Daniel Campelo

    DB:3.06:Class Methods Throught Reflect p7

    You won ;)

    This is the stats. 'i' corresponds to the number of iterations (suposing it was the number of class's)

    i = 999
    Total methods = 258
    Total Time = 1065 millis
    Average Time per Iteration = 1 millis

    Thanx for all,
    Daniel Campelo

  • RELEVANCY SCORE 3.06

    DB:3.06:Which Class Contains The Definition Of Getheader() Method ? c7


    The declaration of getHeader() method is in an interface HttpServletRequest. According to my knowledge, an interface contains abstract methods ( only declaration ), and only a class can contain the definitions of a method. Also, we are not overriding that method. Then,

    Which class contains the definitions of the methods in interface HttpServletRequest / HttpServletResponse ?

    I searched a lot. But, I didn't get the answer. I think, you people can help me ......

    DB:3.06:Which Class Contains The Definition Of Getheader() Method ? c7

    The servlet container provides implementation for that interface. So if you are using Tomcat, tomcat will provide the implementations for HttpServletRequest / HttpServletResponse...

  • RELEVANCY SCORE 3.06

    DB:3.06:Find Directory In Location Relative To Class cm


    Is there a better way to do this?

    I have a package with a main class called 'RainfallSeriesTranslator.bin.ui.Launcher' and some methods in a sub-directory called 'RainfallSeriesTranslator.bin.methods'. The 'methods' directory will always be in the same relative location to 'ui.Launcher', but the package could be in any location on the users machine. My intention is to develop a number of classes and to drop them into the 'methods' directory as and when, so 'Launcher' needs to be able to dynamically (or at least at compile time) list out the contents of the 'methods' directory as strings into an array called 'contents'.

    My earlier attempts got it to launch from Eclipse, but not from the command prompt. I think I have traced this error to my use of the working directory as a prepend to the 'methods' directory.

    The following is a successful work-around (see 'getMethods'). My idea was to get the URL of 'Launcher' as a 'bearing' and to change the relevant references to point to 'Methods'. It works for WinXP and Mac OS X.

    However, it looks long-winded. Is there a better way to do it? (I have left the string manipulations uncondensed for readibility). Would this fall over on another (common) operating system?

    package ui;

    import java.io.File;
    import java.io.FilenameFilter;
    import java.util.ArrayList;

    public class Launcher {
    private final static String name = "RainfallSeriesTranslatorPanel";
    private final static String[] methods = getMethods();
    private final static String fileExt = ".class";

    public static void main(String[] args) {
    new Panel(name, methods);
    }

    public static String[] getMethods() {
    String fileSeparator = System.getProperty("file.separator");

    //Find the URL of this class
    String str1 = Launcher.class.getResource("Launcher.class").toString();

    //Remove the "file:/" part of the URL
    String str2 = "file:/";
    String str3 = str1.replace(str2, "");

    //Replace the last part of the filepath
    String str4 = "ui/Launcher.class";
    String str5 = "Methods";

    //Assemble the absolute filepath name with system specific file separators
    //Works on WinXP and Mac OS X
    String str6 = str3.replace(str4, str5);
    String methodDirectory = fileSeparator + str6.replace("/", fileSeparator);

    File dir = new File(methodDirectory);
    ArrayList String methodsAL = new ArrayListString();

    FilenameFilter filter = new FilenameFilter() {
    public boolean accept(File dir, String name) {
    return name.endsWith(fileExt);
    }
    };

    String []contents = dir.list(filter);

    for (int i = 0; i contents.length; i++){
    methodsAL.add(contents.replace(fileExt, ""));
    };

    return methodsAL.toArray(new String[methodsAL.size()]);
    }

    public String getPanelName() {
    return name;
    }

    public String getFileExtensionName() {
    return fileExt;
    }
    }PS Its curious that Mac OS X needs the absolute path to start with a file separator, but Windows seems to ignore it - possibly because it occurs before a 'C:' type of reference. I don't have an explanation, I'm just observing something that appears to work.

    DB:3.06:Find Directory In Location Relative To Class cm

    I tried using the user.dir on Windows and it worked as described except that it apparently used the wrong file separator, using 2 slashes between each folder name. I don't know why this happened, but maybe it could explain the problem above?

  • RELEVANCY SCORE 3.06

    DB:3.06:Inheritance pp


    I have 6 classes inside a package. I have a demo class inside the same package. I have a string object and I want to call methods to it. example:

    package java;

    public class Demo {

    String name = getName();
    }

    Whats methods can I call to name? Do I need to refrence an object to name to define what methods I can call?

    DB:3.06:Inheritance pp

    idedenfier expected messageThis usually means that the code it's talking about can only appear in a method or a constructor. You have it in the part of the class that can only contain declarations.

  • RELEVANCY SCORE 3.05

    DB:3.05:Name Clash While Implementing In Abstract Class m8


    I've got an interface which i'm implementing in a generic abstract class and when I compile my abstract class all of my methods give name clashes with the ones from the interface, both the implemented and the abstract method. I get compile-errors such as this one:

    name clash: add(Elem) in week7.util.SortedListElem and add(Elem) in week7.util.SortedSet have the same erasure, yet neither overrides the other
    public abstract class SortedListElem implements SortedSet {

    And i get a warning that the abstract class uses unchecked or unsafe operations and that I should recompile with -Xlint

    My method headers look like this:

    public boolean add(Elem elem){

    Does anyone know what I'm doing wrong? Thanks in advance.

    DB:3.05:Name Clash While Implementing In Abstract Class m8

    I don't know generics, but maybe it's supposed to be public boolean add(ObjectElem elem){ ?

  • RELEVANCY SCORE 3.05

    DB:3.05:How To Get The Class Name Of An Api Method? 8x


    Like most of us, it's difficult to know where every method within a Java class is. Also, many of the same methods are scattered throughout Java Classes. I know of two methods that retreive this... getClass().getName(). But, you must have an object to use these. Is there a way to find out what Class contains a method or Class variable thru an Applet or Java Application?? Obviously, I can look at API Docs; but this takes time.

    Tks Randy

    DB:3.05:How To Get The Class Name Of An Api Method? 8x

    Like most of us, it's difficult to know where every method within a Java class is. Also, many of the same methods are scattered throughout Java Classes. I know of two methods that retreive this... getClass().getName(). But, you must have an object to use these. Is there a way to find out what Class contains a method or Class variable thru an Applet or Java Application?? Obviously, I can look at API Docs; but this takes time.

    Tks Randy

  • RELEVANCY SCORE 3.05

    DB:3.05:Class And Memory s9


    Please help me understanding the memory consumption factor between a class with properties and a class with methods. Here class with properties is a class which has “only” public properties and class with method has public properties and public methods.I feel the class with properties and methods will take little more memory than the class with properties. If that is the case, how best to use classes with properties and methods because in the long run, more methods may get added to the class as and when requirement of an application grows. One day if a class contains more than 100 methods that will it eat up more memory. I am more inclined towards separating class with properties as one entity and putting related methods in another class (class with methods). So that when I use class with properties as a collection with 100+ instances it will be lighter and takes less memory for object caching.Thanks in advance.

    DB:3.05:Class And Memory s9

    The practical answer to this is that it doesn't really matter. When a class is instantiated, enough memory is allocated by the runtime to hold any class fields plus a method table. Properties are syntatic sugar that actually get compiled to a correspondng set of get_PropertyName and set_PropertyName functions (assuming the property has both a get and set accessor), so even when using properties you are using a class with methods. You are correct in that the more methods a class has, the more memory it will require because the method table has to be larger.
     
    As I mentioned, the practicality of providing such a separation as you describe is very limited and not considered proper OO development. My reccommedation is to bult the class to fulfill your need and not worry so much about the internals of how much memory is allocated for a class with 10 functions or a class with 100 functions. The biggest deciding factor for that isn't the number of functions but the number and size of the class fields (and even that isn't generally something you need to worry about).

  • RELEVANCY SCORE 3.05

    DB:3.05:Classes &Amp; Classes ks


    Hey!
    I'm an absolute beginner at java and I've encountered my first problem. I've made a class with a couple of methods. My learning book told me to make a testclass, to test the methods of the class i've made earlier. So i've made the test class, but for some reason I get a error when running the test class. No such method. But the classes are located in the same director!
    please help

    regards

    DB:3.05:Classes &Amp; Classes ks

    Without your code it's hard to tell - no such method could mean you have your method signature wrong or you didn't get your main method coded correctly or possibly something else - post the test class, and (if it's not too large) the class your testing and the command you used to run your test class. Please place [code][/code] tags around your code.

    Good Luck

    Lee

  • RELEVANCY SCORE 3.05

    DB:3.05:Bug In Vs2010 Ultimate (Final Version) az


    Hi,
    I have an ASP.NET website, and a class in the App_Code folder. This class contains some public methods. Well, I CAN'T SEE THE NAMES OF THE METHODS at the code view of the class. The names are there, because I can make instances of the class and call its
    methods, and it compiles well, but in the place of the method name there is just empty space!
    Any idea?Jesús Bosch Aiguadé
    http://geeks.ms/blogs/jbosch
    http://uoc.dotnetclubs.com

    DB:3.05:Bug In Vs2010 Ultimate (Final Version) az

    I solved it just cutting and pasting all the code... but I tried lots of things , including reseting the computerJesús Bosch Aiguadé
    http://geeks.ms/blogs/jbosch
    http://uoc.dotnetclubs.com

  • RELEVANCY SCORE 3.04

    DB:3.04:Problem With Getting Methods From Object pk


    I'm attempting to build a method that searches a vector of objects based on a a foreign key given. I'm trying to decompose the object an get its methods so i can invoke the get method for the key in the object and compare it to the key given. My problem is that I cant get the methods in order as I have written them in source. Is their a way to get the methods in order or am I SOL. Here is an example of the code:

    public static String searchVector(int intForeignKey, Vector aVector) {
    try{
    //get the object name
    Class aClass = null;
    aClass = aVector.elementAt(0).getClass();

    //Get the actual class name
    String strClassName = aClass.getSimpleName();
    System.out.println("The Class Name is: " + strClassName);

    //get the fields of the class
    Field[] aField = aClass.getDeclaredFields();
    for(int x = 0; x aField.length; x++){
    System.out.println("The Field Name is: " + aField[x].getName());
    System.out.println("The Field Type is: " + aField[x].getType());
    }

    //Get the Constructors
    Constructor[] aConstructor = aClass.getDeclaredConstructors();
    for(int x = 0; x aConstructor.length; x++){
    System.out.println("The Constructor Name is: " + aConstructor[x].toString());
    }

    //Get the Methods
    Method[] aMethod = aClass.getDeclaredMethods();
    for(int x = 0; x aMethod.length; x++){
    System.out.println("The Method Name is: " + aMethod[x].toString());
    }

    //Invoke the Method (getter to get the ID)
    Object obj = aMethod[1].invoke(aVector.elementAt(0), new Object[]{});

    System.out.println("The value returned from the Method call is: " + obj.toString());

    for(int x = 0; x aVector.size(); x++){
    if(intForeignKey == Integer.valueOf(obj.toString())){
    //Do Something
    }
    }

    //Return Something
    return null;
    }
    catch(Exception e){
    System.out.println("Error occured in Class: ClsUtilities. Method: searchVector. Error: " + e.getMessage());
    return null;
    }
    }

    Any Ideas?

  • RELEVANCY SCORE 3.04

    DB:3.04:Abstract Class And Rmi z7


    Hi!

    I have a desgin where I have an abstract class that in its constructor registers itself in a registry and define three abstract methods. Then I have a class that extends the abstract class and implements the three methods.

    One of the methods inserts som text in a textArea defined in the child of the abstract class but when I call this method remotly I get a nullpointer exception saying that the textArea has not been initialized. The child ofcause calls super in its constructor.

    So my question is can you not extend an abstract class that register it self in the constructor and then call methods remotly that uses variables that have been initialized in a childs constructor?

    Have your any idea to why I get the nullpointer exception?

    Peter

    DB:3.04:Abstract Class And Rmi z7


    Ah, no, running both on the one machine; shouldn't
    make a difference in principle, but I'll give that a
    go tonight.No, you are right. I haven't tought about that.
    Could you mail me the code that you have working on petani at(@) daimi.au.dk so that I can see if it just some stupid bug?

    Thanks for all your help
    Peter

  • RELEVANCY SCORE 3.04

    DB:3.04:Java.Lang.Unsatisfiedlinkerror While Reading Dll Methods 8s


    Hi All,

    Iam getting java.lang.UnsatisfiedLinkError: iam able to load the library from system32 but getting the problem while accessing the methods. I have .h files and source of c files. Is there any relation between dll name and Java class name.

    Please any one help me to get out of this problem.

    Thanks in Advance,
    Srinivas.

    DB:3.04:Java.Lang.Unsatisfiedlinkerror While Reading Dll Methods 8s

    The question does not provide enough information.

    Some standard reasons for unsatisfied link
    1. JNI Library not loaded.
    2. JNI signature doesn't match

  • RELEVANCY SCORE 3.04

    DB:3.04:Get And Set cm


    Hi all,

    I have a doubt with get and set methods in bean class..

    Out method name of the getter and setter method name should start with get and set, why is it so?
    Where they mentioned it in the Java API?

    DB:3.04:Get And Set cm

    With regard to the reply above..

    I am using Struts 1 framework in my project and I have tested it over there.
    In Struts we call the ActionForm class as bean class, which will have getters and setters for the properties that we use in our jsp file.
    I tried to open the jsp page after changing the method names (like it wont start with get and set), but I am getting error.

    Please explain..

  • RELEVANCY SCORE 3.04

    DB:3.04:How I Can Change Method Impletation Thrgouh .Refelection In Memory Mean Run Time 7k


    Let Suppose We a an Class Name called Student
    that Contain Some properties and methods name like ADD and GET method in this class
    Methods Has own Some Implications.
    Now I want to Do I am using this student class in different Program.
    Here I took a Class Name SunTypeT like this in which
    Here I am get all methods info or fields info in Constructor on SunTypeclass Using Reflection.
    this class looklike this

    SunTypeT
    {
    Public SunType()
    {
    //Here I am get all Meta data of particular type
    }
    }
    Now I want Give Body of Any methods that I ll get in Constructor
    How Can do this If You have any Suggestion Please let me know

    DB:3.04:How I Can Change Method Impletation Thrgouh .Refelection In Memory Mean Run Time 7k

    Hi Sunny,

    How is it going with Paulo's suggestion?
    We are looking forward to hearing from you.

    Havea nice day,Leo Liu [MSFT]
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  • RELEVANCY SCORE 3.04

    DB:3.04:If I Know A Name Of Class , How Can I Get It's Attribute And Methods zm



    If I know a name of class , how can I get it's attribute and methods as well as it's detail information by ABAP code ?

    Best regards ,

    DB:3.04:If I Know A Name Of Class , How Can I Get It's Attribute And Methods zm


    hi, Sharat ,

    Do you know how to get message parameters from the class ?

    Get_methods can only get method name.

    Best regards,

  • RELEVANCY SCORE 3.04

    DB:3.04:Create Class Objects From An Array Of File Objects mp


    Hi There,

    I'm having extreme difficulty in trying to convert an array of file objects to Class objects. My problem is as follows: I'm using Jfilechooser to select a directory and get an array of files of which are all .class files. I want to create Class objects from these .class files. Therefore, i can extract all the constructor, method and field information. I eventually want this class information to display in a JTree. Very similar to the explorer used in Netbeans. I've already created some code below, but it seems to be throwing a NoSuchMethodError exception. Can anyone please help??

    Thanks in advance,

    Vikash

    /* the following is the class im using */

    class FileClassLoader extends ClassLoader {

    private File file;

    public FileClassLoader (File ff) {
    this.file = ff;
    }

    protected synchronized Class loadClass() throws ClassNotFoundException {

    Class c = null;
    try {

    // Get size of class file
    int size = (int)file.length();

    // Reserve space to read
    byte buff[] = new byte[size];

    // Get stream to read from
    FileInputStream fis = new FileInputStream(file);
    DataInputStream dis = new DataInputStream (fis);

    // Read in data
    dis.readFully (buff);

    // close stream
    dis.close();

    // get class name and remove ".class"
    String classname = null;
    String filename = file.getName();
    int i = filename.lastIndexOf('.');
    if(i0 ifilename.length()-1) {
    classname = filename.substring(0,i);
    }

    // create class object from bytes
    c = defineClass (classname, buff, 0, buff.length);
    resolveClass (c);

    } catch (java.io.IOException e) {
    e.printStackTrace();
    }

    return c;

    } // end of method loadClass

    } // end of class FileClassLoader

    /* The above class is used in the following button action in my gui */
    /* At the moment im trying to output the data to standard output */

    private void SelectPackage_but2ActionPerformed(java.awt.event.ActionEvent evt) {
    final JFileChooser f = new JFileChooser();
    f.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
    int rVal = f.showOpenDialog(Remedy.this);
    // selects directory
    File dir = f.getSelectedFile();

    // gets a list of files within the directory
    File[] allfiles = dir.listFiles();

    // for loop to filter out all the .class files
    for (int k=0; k allfiles.length; k++) {

    if (allfiles[k].getName().endsWith(".class")) {
    try {

    System.out.println("File name: " + allfiles[k].getName()); // used for debugging

    FileClassLoader loader = new FileClassLoader(allfiles[k]);
    Class cl = loader.loadClass();

    //Class cl = null;

    Class[] interfaces = cl.getInterfaces();
    java.lang.reflect.Method[] methods = cl.getDeclaredMethods();
    java.lang.reflect.Field[] fields = cl.getDeclaredFields();

    System.out.println("Class Name: " + cl.getName());
    //print out methods
    for (int m=0; m methods.length; m++) {
    System.out.println("Method: " + methods[m].getName());
    }
    // print out fields
    for (int fld=0; fld fields.length; fld++) {
    System.out.println("Field: " + fields[fld].getName());
    }

    } catch (Exception e) {
    e.printStackTrace();
    }
    } // end of if loop
    } // end of for loop

    packageName2.setText(dir.getPath());
    }

    DB:3.04:Create Class Objects From An Array Of File Objects mp

    It's throwing the exeption on the line:

    FileClassLoader loader = new FileClassLoader(allfiles[k]);

    I'm sure its something to do with the extended class i've created. but i cant seem to figure it out..

    Thanks if you can figure it out

  • RELEVANCY SCORE 3.04

    DB:3.04:Subclassing And Inner Classes 9p


    Hi there,

    I have an existing class "A", supplied by a third party, that contains a private inner class "I".

    I have subclassed "A" to a new class "B" to add new functionality, and I also want to replace the inner class "I" with new behaviour. The inner class "I" is invoked by methods within "A" that I have not overridden in "B". Replacing "I" appears to be impossible under these circumstances.

    My initial experiment was to create a new inner class "I" within "B" with the same name and signature as the "I" defined within "A", so...

    Class B extends A {
    private class I {}
    }

    The code that invokes "I" is still within "A" and so my version of the "I" class is ignored, and the original "I" is invoked instead.

    Let's be clear about this, I am not surprised by this behaviour, I'm just wondering if there is any way I can get my "I" invoked by the methods in "A". If that is indeed impossible I will have to write new methods in "B" that override the invoking methods in "A".

    I did a search on the forums using the title I gave this topic, and got some fairly close hits, but nothing seemed to quite answer my question.

    Hope that all made sense. Thanks for any help.

    Regards,
    Tim

    DB:3.04:Subclassing And Inner Classes 9p

    Excellent, those are both good reasons why I shouldn't even attempt to do that, so instead in "B" I have overridden the "A" methods to call my new "I", and it works fine.

    Thanks,
    Tim

  • RELEVANCY SCORE 3.04

    DB:3.04:Check My Class Declaration On My Own Rules p3


    I'm doing my own FxCop rules for checking my class, methods and atributtes namingI have two questions again:1 - Checking the fields on my class I can know the type name and namespace fo them, but if I want to check the name of every single class in my project, how can I get it? For example if I have a form like this:    MyForm1 : System.Windows.Forms.Form   {   }and I want all my form with an specific name format, for example: beginning with FormHow can I check the class name without cheking it through their fields?? How can I know the classes of which it inherits??2 - If I declare an interface I check their member and class name like a normal class?? How can I know if a declaration is a delegate, a class, an interface, an enum or others??Thanks for your help

    DB:3.04:Check My Class Declaration On My Own Rules p3

    Thank you very much. That was my mistake and I'm debugging perfectly now

  • RELEVANCY SCORE 3.04

    DB:3.04:Problem In Calling The Methods Using Instance 3z


    hi

    I got two classes int the same package like

    package com.duke;// package name

    a) Details .java// class name

    b) Results .java // class name

    Deatils .java is coded with set and get methods and this class compiled well and genrated class file

    Proelm with Results .java class. In this class i use an constructor to create a instance so that i can call the get method in the Details .java . But compiler throwing error like and code given below

    Code details For Result .java is
    public final class Result
    Details f = new Details();
    String lastName = f.getLastName(); // this method is from Details classError
    Cannot find Symbol
    class: Details .java
    location : class com.duke.Details
    Details f = new Details ();

    DB:3.04:Problem In Calling The Methods Using Instance 3z

    Is this reply #3 of 0, or what?
    Goofy forum appears to be acting up again.
    Before I posted this reply, my first reply showed:
    Reply 1 of 0
    And yawmark's indicated:
    Reply 2 of 0
    And the main page indicated there were 0 replies.

    Message was edited by:
    warnerja

  • RELEVANCY SCORE 3.04

    DB:3.04:Drawbacks Of Static Methods? c3


    What's the better approach for utility methods:

    a) write abstract class with static methods
    b) write class with non-static methods and instantiate this class to call the public methods.

    ?

    DB:3.04:Drawbacks Of Static Methods? c3

    What's the better approach for utility methods:

    a) write abstract class with static methods
    b) write class with non-static methods and instantiate
    this class to call the public methods.

    ?I would say that a usually preferable to c.

    There is a third way:
    If you want the advantages of a class with non static methods (e.g. Implementing interfaces / extending other classes) without instantiating objects over and over then the singleton pattern os for you:
    http://www.google.com/search?hl=enie=UTF-8oe=UTF-8q=singleton+pattern

  • RELEVANCY SCORE 3.03

    DB:3.03:Inheritance 3j


    I am trying to learn Inheritance
    I have 6 data classes that get the same data but have different fields
    So I decided to create six separate classes that get the data and found that each class had several methods the same so I create a base class and moved all the duplicate methods to the base class
    Each inherited data class has encapsulation by setting the methods to private and the base class methods are set to protected so the inherited classes have access to the base class methods and the base class methods are not exposed through the base class.
    Only one method in the base class has a public accessor that expects an integer that determines the data needed to be return as a list(of t)
    Do I have method stubs in the base class that have the same signature as the derived class.
    Can someone tell me what the derived class method stubs should be decorated with Like Must Inherit and what the base class stubs protected methods should have something like overrides
    Finally I need to instanciate the base class on the form that just supplies a list(of t) which I will later add a interface
    I don’t claim that I have any idea what I am talking about but just explaining what I have done and what I believe is the way it is done
    Can someone point me in the right direction

    DB:3.03:Inheritance 3j

    Thanks
    All is good.
    The sample I provide was 90% correct and after reading and creating a sample from Dr Jack Purdum I have a understanding where I was stupid.
    Not only do I have the code working but it implements Generics and a Interface as well Thanks Dr.
    As for the other comments I understand why the internet has anger issues.
    I don't care, Iadmitted too not having any idea on what I was doing and the purpose of asking the questions, I know now some that responded didn't either.
    After I Mark Paul as the Answer I received more comments which I deleted without reading. Paul was the only one that seemed to say on subject and the reason for accepting his answer while not have having any answers from this group.
    Now I have a better understand and all is good.