• RELEVANCY SCORE 6.19

    DB:6.19:Abstract Class 13




    Difference between abstract class and interface
    use of abstract class

    DB:6.19:Abstract Class 13

    This question has been asked here about a billion times:

    http://search.java.sun.com/search/java/index.jsp?qt=interfacenh=10qp=st=11rf=0since=country=language=charset=variant=col=javaforums

  • RELEVANCY SCORE 5.89

    DB:5.89:Difference Between Abstract Interface And Normal Interface za




    Hello Friends,

    What is the Difference between abstract interface and normal interface?....

    DB:5.89:Difference Between Abstract Interface And Normal Interface za

    What is the Difference between abstract interface and
    normal interface?....The difference is that you didn't follow convention in the first case. All interfaces are implicitly abstract so you don't have to declare them as such.

  • RELEVANCY SCORE 5.87

    DB:5.87:Abstract Class And Interface???? 39




    hi all, i would like to know the difference between abstract class and interface....could anybody enlighten me on this....

    DB:5.87:Abstract Class And Interface???? 39

    P.S. don't be a loser an put up multiple posts, especially on something so easy to do a search on.

  • RELEVANCY SCORE 5.60

    DB:5.60:Help With Interface And Abstract cs


    Hi all

    what is the difference between an interface and an abstract class??

  • RELEVANCY SCORE 5.47

    DB:5.47:How Does An Abstract Annotion Work? 3a


    hey i'm just learning about annotations but I don't get the difference between a normal annotaion type and an abstract annotion type, e.g.

    public @interface AuthorDetails {

    String firstName();
    String phoneNumber();
    int age();
    String gender() default "male"; //Creates the default value for gender
    String[] favouriteTVShows();
    }abstract @interface Favourites {

    String[] food();
    int number();
    String season();
    String planet() default "Saturn";

    }It seems like all attributes have to be set, whether it's abstract or not abstract so where would you use an abstract annotation type? and what's the difference? (sorry about the incorrect terminology, i don't know what the actual name of the members within the annotation type specification are called.

    Thanks

    DB:5.47:How Does An Abstract Annotion Work? 3a

    Nothing whatsoever. Annotations borrow from the "regular" interface mechanism, and, just like interfaces, they're all implicitly abstract. Because the compiler knows this, you can happily leave off the word 'abstract' from the declaration, and it'll fill it in for you. Same with interfaces themselves, and methods on interfaces: you can declare them abstract or not, but it makes no difference at all; they're always abstract anyway. Likewise, all methods on interfaces are implicitly public, whether you declare them so or not, and all fields on interfaces are public, static and final, whether you declare them so or not. Try it out

  • RELEVANCY SCORE 5.43

    DB:5.43:A C Sharp Basic Question! s9


     
    I wonder the difference between the abstract class and the interface!
    Someone help me!

    DB:5.43:A C Sharp Basic Question! s9

     xiaobin700 wrote:

     
    Thanks
    Can a method in an abstract  class be overload? And how about an interface?

  • RELEVANCY SCORE 5.31

    DB:5.31:Core Java 83


    what is differernce between abstract class and interface?

    DB:5.31:Core Java 83

    jwenting wrote:
    maybe an attempt at counting only posts which make any kind of sense at all?Where did the '1' come from then?

  • RELEVANCY SCORE 5.31

    DB:5.31:Outbound And Abstract Sync Message Interface Difference zs



    Hi Experts,

    Is there any difference between the input and output messagetype for Outbound/Inbound Synch Message Interface and Abstract Sync Message Interface.

    Do we need to mention the same input and output messagetype for both outbound and Abstract or it should be otherway around?

    Regards

    Sara

    DB:5.31:Outbound And Abstract Sync Message Interface Difference zs


    ---Is there any difference between the input and output messagetype for Outbound/Inbound Synch Message Interface and Abstract Sync Message Interface.

    No there is not. U can select any message type irrespective of the type of message interface.

    ---Do we need to mention the same input and output messagetype for both outbound and Abstract or it should be otherway around?

    Yes. As per ur requirement u can specify the same.

    Regards,

    Prateek

  • RELEVANCY SCORE 5.31

    DB:5.31:C#: What Is Difference Between Abstract Class And Interface? How To Decide To Use Which One? 18


    I have been asked a question: how to decide to use Abstract class or Interface?
    We know that the Interface is special Abstract. All definitationsare default public and without implemetion. Classed inherit from interface has to implement all definitions.

    Abstract class does not need to implement all the methods and it can not be instantiated.
    Classes inheritfrom abstract classmay sharecommon logic (properties or methods) with abstract class and also override some methods' behavior.
    How to clearily answer this question? Thx!

    JaneC

    DB:5.31:C#: What Is Difference Between Abstract Class And Interface? How To Decide To Use Which One? 18

    Hello JJChen,
    Interface class can be implement in small units of data but abstraction class can be implemented in large units of data.
    1. Here is explanation of
    Interface class
    2. Here is explained
    Abstraction class.
    3.
    Difference betweenAbstraction andInterface class.
    Hope it will help you a lot.
    thanks,

  • RELEVANCY SCORE 5.29

    DB:5.29:Abstract Class And Interface 17



    Please tell me what is Abstract Class and Interface. Please explain with help of simple example and also tell me difference between them.

    DB:5.29:Abstract Class And Interface 17


    hi

    i will suggest u to refer some basic java book , to clear ur basic concept of OOPS , because these principal remain same for all languages that follow OOPS concept .

    and under standing these with java is easier then with ABAP .

    Abstract Class

    class which have atleast 1 method which is declared only , (no definition is given for it in this class is mentioned as Abstract Method )

    and that class is defined as Abstract class

    Interface :

    only declaration of method done here , no method will be defined here , class which will implement this interface will give definition .

    Diff. b/w Abstract Class and Interface :

    ABS Class can have method with there definition , but one method should be there with declartion only.

    Interface will have all method with out definition .

    hpoe this help u .

    reward if helpful.

  • RELEVANCY SCORE 5.23

    DB:5.23:Why We Use Interface? c9


    I appeared one of my interviews.The Interviewee asked me a question that

    Suppose one is abstract class and one is interface.
    All the methods of abstract class are abstract.
    Then on this level what is the difference between abstract
    and interface and why we use interface. I could not answer properly.
    Please guide me the actual difference between Abstract class and Interface.
    Thanks

    DB:5.23:Why We Use Interface? c9

    google is your friend! Dear You are also my friend ;)

  • RELEVANCY SCORE 5.16

    DB:5.16:Difference Between Interface And Abstract Class zk


    hai

    please tell me what is the difference between interface and abstract class?

    when i want use inteface? when i want use abstrct class?

    give me the simple example for that?......

    DB:5.16:Difference Between Interface And Abstract Class zk

    This thread is moved from "JavaServer Pages (JSP) and JSTL" to here.

  • RELEVANCY SCORE 5.13

    DB:5.13:What Is Difference Between Interface And Abstract? 3s


    Many time, I just confuse the purpose of interface and abstract.
    When should use interface or abstract in real world?
    Please give me the difference point alike point of both interface and abstract.

    Thank you.

    DB:5.13:What Is Difference Between Interface And Abstract? 3s

    Hi
    Take a look on this
    http://www.c-sharpcorner.com/UploadFile/yougerthen/104232008193919PM/1.aspx
    Reguards

    The complexity resides in the simplicity Follow me at: http://smartssolutions.blogspot.com

  • RELEVANCY SCORE 5.13

    DB:5.13:Difference Between Abstract Class And Interface ? fz


    CAN ANY BODY TELL ME THE DIFFERENCE BETWEEN THE ABSTRACT CLASS AND INTERFACE ?

    DB:5.13:Difference Between Abstract Class And Interface ? fz

    - An abstract class is a class that can not be instantiated but that can contain code, i.e. it gives you the ability to specify default implementations of methods.

    - An interface only contains methods but does not contain any code and you need to implement all the methods defined in the interface.
    - Interfaces may be multiple-inherited, abstract classes may not
    http://www.codeproject.com/Articles/11155/Abstract-Class-versus-Interface
    http://stackoverflow.com/questions/56867/interface-vs-base-class

  • RELEVANCY SCORE 5.13

    DB:5.13:Abstract Class Vs Interface ak


    hi,
    i know this is a very simple question but pliz answer it with implementation details.

    What is the difference beteen ABSTRACT CLASS INTERFACE?
    Just answer me when can a programmer use ABSTRACT CLASS when can he use INTERFACE.

    i need the situation not the theory,that are available in all java books.

    keep smiling...
    Deb

    DB:5.13:Abstract Class Vs Interface ak

    Interfaces are used to allow a class to have multiple personalities. A class can implement any number of interfaces and this will allow it to be any of those types of objects. (It's almost like multiple inheratence)

    An abstract class has to be extended and you can only extend one abstract class.

    An abstract class defines a general idea of what the object is. You extend it to fill in the details.

    An interface provides a framework for expected behaviour you provide the details of that behaviour.

  • RELEVANCY SCORE 5.13

    DB:5.13:Difference Between Inteerface And Abstract 11


    Hi,Please Anyone can tell me What is the difference between Abstract and Interface?Where we can use interface and where we can use abstract?What is the uses of both?

    DB:5.13:Difference Between Inteerface And Abstract 11

    I agree with the all of the above, just adding one more thing:
    An interface is a pure abstract

  • RELEVANCY SCORE 5.13

    DB:5.13:Difference Between Interface And Abstract Class a1


    Hi sirs,

    Give me the differences between interface and abstract class
    and when we go for interfaces and abstract class in developing an application

    DB:5.13:Difference Between Interface And Abstract Class a1

    An interface is a 100% abstract class, which means it doesn't contain any code, just method names and signatures. You use abstract classes when you want some code to be shared among the inheritors.

    The advantage with interface is that a class can implement as many interfaces as you like, while it can only extend one (abstract) class.

    So, you use interfaces when you need to extend other classes or doesn't want any code shared, and abstract classes when you don't want to extend other classes, and would like to share some code.

  • RELEVANCY SCORE 5.09

    DB:5.09:Abstract Class Vs Interface sc


    can anyone pls help me in understanding difference between an interface and an abstract class which has no function with implementation

    which is better abstract cls or interface in term of speed, features..?
    Thanksbahushekh

    DB:5.09:Abstract Class Vs Interface sc

    To Mike Feng or any other moderator,
    Can you unmark
    as answer the previous post from myself please?
    Reason: It has no relevance to the original question, I was just replying to the post preceding it from RudeDog2
    which I also feel, does not really relate to the original question.
    I will leave it to Rudy to decide if He wants that post to be unmarked.

    Regards,

    John

    Click this link to see how to insert a picture into a forum post.

  • RELEVANCY SCORE 5.08

    DB:5.08:Interface Relation Between Servletrequest And Httpservletrequest 1z


    a newbie question, both are interface, and

    public abstract interface javax.servlet.ServletRequest extends java.lang.Object

    public abstract interface javax.servlet.http.HttpServletRequest extends java.lang.Object implements javax.servlet.ServletRequest

    Why not interface javax.servlet.http.HttpServletRequest direct extends interface javax.servlet.ServletRequest ?

    DB:5.08:Interface Relation Between Servletrequest And Httpservletrequest 1z

    the signature of HttpServletRequest class is

    public abstract interface HttpServletRequest
    extends ServletRequest

    NOT

    public abstract interface javax.servlet.http.HttpServletRequest extends java.lang.Object implements javax.servlet.ServletRequest

  • RELEVANCY SCORE 5.06

    DB:5.06:Diff. Between Interface And Abstract Class 3s


    hi,
    Can any one tell me about diff between interface and abstract class in practical way.advanced thanks for ur response.
    -PVMVS

    DB:5.06:Diff. Between Interface And Abstract Class 3s

    This question gets asked all the time. I found lots of hits by searching this forum with the words: interface abstract class difference

    I'm sure google will return even more. Searching existing posts should always be done before posting.

  • RELEVANCY SCORE 5.06

    DB:5.06:Assigning Object To Interface Type And Abstract Class Type. pm


    Can any one please tell me what is the difference between assigning the object to Interface type and abstractclass type instead of assigning to class type except that, if we assign an object to interface or abstractclass type, then we can access only the methods available in interface or abstract class.
    Code:
    Class cls = new Class();

    // Need Difference between the following

    Interface inf = new Class();
    AbstractClass abscls = new Class();Thankyou,
    Ram

    DB:5.06:Assigning Object To Interface Type And Abstract Class Type. pm

    Note: This thread was originally posted in the [Reflections Reference Objects|http://forums.sun.com/forum.jspa?forumID=4] forum, but moved to this forum for closer topic alignment.

  • RELEVANCY SCORE 5.05

    DB:5.05:Difference Between Interface And Abstract Class zm


    What is the differrence between an abstract class and an interace? and when would you use one over the other?

    DB:5.05:Difference Between Interface And Abstract Class zm

    What is the differrence between an abstract class and
    an interace? and when would you use one over the
    other?To (over-)summarise:
    An interface defines what you want to do, but doesn't tell you how to do any of it.
    An abstract class may define some of how to do it, but not necessarily all.

    RObin

  • RELEVANCY SCORE 4.99

    DB:4.99:Difference Between Abstract Class And Interface ca


    Hi everyone,

    CAn anyone explain why the following happen????

    --------------------------------------------------------------------------------
    Abstract class can have a constructor, Interface cannot.
    Abstract class can have static methods, Interface cannot.
    --------------------------------------------------------------------------------

  • RELEVANCY SCORE 4.96

    DB:4.96:Diff Between Abstract Class And Interface - Is This A Difference 7m


    This is quite a common topic thats discussed in any java forums . I would like to confirm if asked about the differences , can I say the following?.

    Abstract class can (or not ) have methods in it and it has no use in instantiating it since it has no meaning in instantiation.
    It has to be inherited for use .
    You need to INHERIT to use an abstract class.
    You can have a variable in Abstract class. ( a silly difference )
    Basically u use an abstract class when you want to provide a generalized form of abstraction and leave the implementation task with the inheriting subclass.

    Interface - group of related methods with empty bodies .
    You need to IMPLEMENT to use an interface.
    I dont think you can have a variable in a interface.
    When you want a few classes to use a few methods which you dont want to be included in the class ,then you go for the interface, which makes it easy to just implement and make use of the methods defined in the interface. But the problem with the interface is that, u have to implement all the methods defined in the interface , even if you dont need some of them.

    PLEASE LET ME KNOW IF THE VARIABLE THING IS A REAL DIFFERENCE. .
    I CANNOT HAVE A VARIABLE DECLARED IN MY INTERFACE RIGHT?

  • RELEVANCY SCORE 4.86

    DB:4.86:Difference Between Interface And Abstract Class mj


    hello friends give me the difference between interface and abstract class
    and link to find java material

    Thanx

  • RELEVANCY SCORE 4.85

    DB:4.85:What Is The Difference Between Abstract And Interface? zd


    Could some one explain what is the difference between abstract class and interface class.

    Lets say I'm creating class why would I choose abstract over interface?

    THanks.

    DB:4.85:What Is The Difference Between Abstract And Interface? zd

    The difference between abstract classes and interfaces is interfaces are defined methods only. In abstract class methods are derived.

  • RELEVANCY SCORE 4.85

    DB:4.85:Good Simple Example Of Difference Between Interface And Abstract Class 83


    Hi All,

    I am new to java...

    I am confused lot about the difference between interface and abstract class....

    Can anybody tell me the difference between interface and abstract class with some good and simple exmple...

    Kindly help me...

    Thanks in advance...

    DB:4.85:Good Simple Example Of Difference Between Interface And Abstract Class 83

    phdk wrote:
    georgemc wrote:
    public class AbstractClassThatIsntAnInterface {

    public abstract void doSomething();
    public abstract void doSomethingElse();

    }Nice naming for a nonabstract class! ;-)

    @OP: read this: [http://java.sun.com/docs/books/tutorial/java/IandI/abstract.html]Er, you, um, spotted my deliberate mistake.....

  • RELEVANCY SCORE 4.82

    DB:4.82:Situation That Describes Difference Between Usage Of Inetrface And Abstract Class x8


    Hi,
    Can anybody please tell me the best example or situation where we can chosse between interface and abstract class?Thanks, Smiley:)

    DB:4.82:Situation That Describes Difference Between Usage Of Inetrface And Abstract Class x8

    Hi Smiley3,
    I am marking this issue as Answered. If you have any new questions or concerns about this issue, please feel free to let me know.
    Thank you and have a nice day!Min Zhu [MSFT]
    MSDN Community Support | Feedback to us
    Get or Request Code Sample from Microsoft
    Please remember to mark the replies as answers if they help and unmark them if they provide no help.

  • RELEVANCY SCORE 4.81

    DB:4.81:Difference 7x


    Hi sirs,
    Give me the main differences between abstract class and interface.Dont give me the links sir,

    when we go to use for the interface and for abstract class in developing an application

    DB:4.81:Difference 7x

    Another link:
    {color:#0000ff}http://forum.java.sun.com/thread.jspa?messageID=9961601{color}

    db

  • RELEVANCY SCORE 4.80

    DB:4.80:Difference Between Abstract Class And Interface j3


    What is the difference between anabstract class and aninterface ?

    DB:4.80:Difference Between Abstract Class And Interface j3

    Hi,
    Check this link differencebetween an abstract class and an interfacePS.Shakeer Hussain

  • RELEVANCY SCORE 4.79

    DB:4.79:Interface Vrs Abstract Class ps


    why would i during design choose for an interface or an abstract class. I cant understand the need for both ?

    To make a class a partially implemented, its has to be abstract.
    I can choose to create a complete Interface heirarchy and simulate the same.........

    Can people clarify why Interface and why abstract.

    Ps: I know difference between both but I want to justify myself why I wud go for abstract class or interface

    Looking for ur inputs

    DB:4.79:Interface Vrs Abstract Class ps

    why would i during design choose for an interface or
    an abstract class.If there was no abstract you would have to use overriding to accomplish the same thing. But abstract is stronger because you clearly state your intention of leaving the implementation to a subclass. Overriding isn't enforced, the subclass always has a choise. In short, using abstract the superclass rules, using overriding the subclass rules.

    So the big deal is when to use abstract and when to use overriding. Interfaces don't have anything to do with that! Interface are used when you want to ensure a class has a certain functionality that is not a natural part of the normal class hierarchy. It's often a common way to access data, like for example iteration.

  • RELEVANCY SCORE 4.74

    DB:4.74:Difference Between Interface And Abstract Class 71


    I'm confused on what is the difference of implementing n abstract class and inheriting an interface?

    DB:4.74:Difference Between Interface And Abstract Class 71

    Hi,
    i want to add a few more differences --
    1.The variable defined inside an interface is public, static and final means it's basically a constant,But in case of abstract class you can hide the variable in the implementation class means you can change the value of the variable.

    One very important thing about the these two feature is when to use what?
    Ans:If a group of object is having some common property such that they are not going to be changed over a period then create an Abstract class out of that property.But if only some object is having a common property but not all then create an interface out of that property and implement all that property in Subclass.

    Thanks.

  • RELEVANCY SCORE 4.70

    DB:4.70:Interfaces Vs. Abstract Classes ps


    1) is there a difference between an interface (that has methods to override) and an abstract class?

    2) also what is the purpose of static members, static methods, and static classes??

    3) is there a distinction between an Abstract Data Type and User Defined Data Types?

    DB:4.70:Interfaces Vs. Abstract Classes ps

    Read Core Java Fundamentals Volume 1 by Horstmann Cornell from Sun Micro. Press release.
    Its a must to know them very well from reading it from the above book rather than relying on what you hav learnt from a discussion board. by the way, its just a personal statement, not intended to offend any fellowmates of the discussion board.

    cheers

    -tamoghna

  • RELEVANCY SCORE 4.63

    DB:4.63:What Is The Difference Between Abstract Class And Interface ? dd


    Hi,

    Could u plz tell me the difference between Abstract class and Interface?

    Thanks in advance.

    Gopi

    DB:4.63:What Is The Difference Between Abstract Class And Interface ? dd

    Lots.

    An abstract class can contain some method implementations, or indeed all the method implementations. It may contain methods with all the various access modifiers. It cannot be instantiated. A class may inherit from only a single abstract class.

    An interface contains only public method stubs and constants. A class may implement multiple interfaces. An interface cannot (obviously) be instantiated.

    Abstract classes are particularly useful when you need to provide a semi-complete implementation for reuse. Interfaces are used more like types.

    Look at java.util.* for some good examples of the use of both.

  • RELEVANCY SCORE 4.59

    DB:4.59:Concrete Class ff


    Hi

    Could someone tell me what the difference is between an abstract class, interface class and a concerte class. Cant figure it out.

    Thank you
    David

  • RELEVANCY SCORE 4.59

    DB:4.59:Difference B/W Abstract Class And Interface mf


    Hi,
    can anyone tell the difference between Abstract class and an Interface?

    Thanks in advance!

    DB:4.59:Difference B/W Abstract Class And Interface mf

    The majoor diiffernce is that Interface canot ber
    inherited while absract calss can be inherited
    one abract class can iheret other abstract class
    while Interface doesnot???

  • RELEVANCY SCORE 4.55

    DB:4.55:Abstract Class And Interface???? ja


    hi all, i would like to know the difference between abstract class and interface....could anybody enlighten me on this....

    DB:4.55:Abstract Class And Interface???? ja

    search the forums, lot's of times answered this one has been.

  • RELEVANCY SCORE 4.51

    DB:4.51:Difference Between Abstract Class And Interface 71


    Here is a fresher in Java. Could any body tell me the difference between Abstract Class and Interface. And suppose Abstract class has three methods, in those, two of them are Abstract and one is normal method, and it has been implemented in that class itself. If we extend the Abstract class to our class, do we need to over ride or implement all the methods that are there in the Abstract class or we need to implement only those methods that have been declared as abstract. If it is so, then what is the purpose of implementing non abstract method in the Abstract class.

    Sravan

    DB:4.51:Difference Between Abstract Class And Interface 71

    public abstract class TestAbstract {
    public abstract void method1();
    public abstract void method2();
    public static void method3() {
    // non-abstract method must have a body
    }
    }

    public class TestAbstract2 extends TestAbstract {
    public void method1() {
    // Does not work:
    // Object test = new TestAbstract();
    TestAbstract.method3();
    }
    public void method2() {
    }
    }- you will have to implement all method which are declared as abstract. you do not need to implement method3 in this example., only method1 and method2.
    - an abstract class cannot be instantiated (doesn't work: Object test=new MyAbstractClass())
    - a non-abstract method in an abstract class can be used, if it's a static member.
    - with "extends" you can only have one class, and your class will inherit the members of the superclass
    - with "implements" you can use multiple interfaces, which are only a description of what you have to write yourself...

  • RELEVANCY SCORE 4.51

    DB:4.51:Abstract Class &Amp; Interface 17


    What is the difference between Abstract Class and Interface Class? What I understood is both has to be defined in the subclass i.e methods. Apart from that Interface supports multiple inheritance whereas Abstract class doesn't. When both has to be defined in the subclass and interface supports multiple inheritance why we still need Abstract Class.

    Thanks in Advance,
    R.Ravindhran

    DB:4.51:Abstract Class &Amp; Interface 17

    A class can only extend one other class (Abstract or not) but it can implement any number of interfaces.

  • RELEVANCY SCORE 4.47

    DB:4.47:Regarding The Abstract And Interface km


    hai,
    I am new to java programming

    I want to difference between abstract interface,interface and abstract class

    public abstract interface Test{}

    public interface Test{}

    public abstract class Test{}

    which kind of situations use the above interfaces and abstract classes

    It would be helpfull if explain with example....

    Thanks

    DB:4.47:Regarding The Abstract And Interface km

    shashikumar, please don't multipost and don't use the browser's back button to edit your post. This creates multiple posts. I've removed the other thread you started a minute after this one.

    db

  • RELEVANCY SCORE 4.43

    DB:4.43:Abstract Vs Interfaces sx


    hi i am looking for the difference between abstract classes and interfaces. i have refered a couple of books but nothing seems to satisfy me. and another thing when to use an abstract class and when to use an interface( other than multiple inheritence)

    thanks

    DB:4.43:Abstract Vs Interfaces sx

    In my opinion, Java sun programmers construct
    abstract classes in order to prevent some of the
    disadvantages of interfaces such that using only
    empty bodied method.It is a joke do not take it serious but it is really true that they construct abstract classes in order to prevent some of the disadvantages of interfaces

  • RELEVANCY SCORE 4.43

    DB:4.43:What Is The Main Difference B/W Interface And Abstract Class 83


    is there any specific difference b/w interface and abstract class. if wht is tht? and how?

    DB:4.43:What Is The Main Difference B/W Interface And Abstract Class 83

    abstract class can be have methods with body

    interface cannot

    interface is 100% abstract class

  • RELEVANCY SCORE 4.43

    DB:4.43:Difference Between A Abstract Class With 4 Abstract Methods And A Interface With 4 Abstract Methods. 8c


    what is the difference between Difference between a Abstract class with 4 abstract methods and a Interface with 4 abstract methods.

    DB:4.43:Difference Between A Abstract Class With 4 Abstract Methods And A Interface With 4 Abstract Methods. 8c

    Your question is better rephrased as: What is the difference between an abstract class and a interfase?
    This has been discused here
    http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/67451957-f0bd-4b9b-a2c0-16f604ce8643
    Regards

  • RELEVANCY SCORE 4.43

    DB:4.43:Interfaces And Abstract Classes 8x


    Whats the difference between an interface and an abstract class.

    DB:4.43:Interfaces And Abstract Classes 8x

    Another trait that is often overlooked is that the abstract methods and constants declared in an interface are always public; with abstract classes, you can declare them (package) and protected scope as well.

  • RELEVANCY SCORE 4.43

    DB:4.43:What Is The Diff Between The Interface And Abstract 9x



    hi,

    could u plz explain the diff between the interface and abstract

    clearly.

    DB:4.43:What Is The Diff Between The Interface And Abstract 9x


    Hi Venkat,

    Check this link

    http://mindprod.com/jgloss/interfacevsabstract.html

    Thanks,

    Vinay

  • RELEVANCY SCORE 4.42

    DB:4.42:Difference % Abstract Class And Interface? d3


    Hi,

    I am confused about abstract class and interface. For interface, the subclass has to implement all the parent class methods. But, it is no need in abstract class.

    However, in which situation should I use abstract class or interface?

    Thanks for explanation.

  • RELEVANCY SCORE 4.40

    DB:4.40:Difference Between The Interface And Abstarct Class ss


    HI all,I have a doubt over Difference between the Interface and Abstarct classi.e interface came into play for these reasons1. pure abstartc class (this can be done using abstartc class tooo)2. multiple inheritanceif i declare a abstartc class with only abstract methods does that ressembles interface i mean them interface adn abstartc class are same ? (except inheritance case)or is any difference in case of memmory allocation etc.,Regards

    Manoj Mathe

    DB:4.40:Difference Between The Interface And Abstarct Class ss

    In interface, you can only have Public access modifier.In abstract class, all acces modifiers are allowed.For example, if you need to declare abstract methods that are internal, private, etc... and that there is no multi inheritance,you need an abstract class.There are other differences.Check this :http://www.codeproject.com/KB/cs/abstractsvsinterfaces.aspxIn terms of memory allocation, I would say it's the same, both are Reference Types, and are so managed in the same way.Hope this helps,Tom

    Thomas Aimonetti - C# - Sharplog Engineering

  • RELEVANCY SCORE 4.40

    DB:4.40:Abstract Interface ss


    Hi All,
    What is abstract interface?What is the difference between Abstract interface and interface?
    If there is no difference why ServletRequest is abstract inteface.
    Thank You,
    Selvaraj

    DB:4.40:Abstract Interface ss

    Have a look at the JLS Chapter 9.1.1.1 abstract Interfaces
    Every interface is implicitly abstract. This modifier is obsolete and should not be used in new programs

  • RELEVANCY SCORE 4.40

    DB:4.40:Abstract Factory Or Strategy Pattern? 3p


    Hello

    Can anyone tell me the difference between abstract factory and strategy pattern? I need to create a interface that needs to variate on different mobile phones (color vs non-color phones) ? Can the factory pattern help or is the strategy pattern enough ?

    Thanks

    DB:4.40:Abstract Factory Or Strategy Pattern? 3p

    Abstract Factory is a case of Strategy applied to the creatation objects.

    You can use both patterns to achieve a result: have different things done in different cases, the difference is where you make that choice: when you instantiate the objects or when you call a method to execute some action.

  • RELEVANCY SCORE 4.39

    DB:4.39:Diffrences Between Abstract Method And Interface kc



    hi all,

    I am requesting here to know more differences between Abstract Method and Interface..
    Thank you.

    DB:4.39:Diffrences Between Abstract Method And Interface kc

    Hi friend,
    An interface, by contrast, is a totally abstract set of members that can be thought of as defining a contract for conduct. The implementation of an interface is left completely to the developer.

    Classes may inherit from only one base class, so if you want to use abstract classes to provide polymorphism to a group of classes, they must all inherit from that class.

    Abstract classes may also provide members that have already been implemented. Therefore, you can ensure a certain amount of identical functionality with an abstract class, but cannot with an interface.
    For more details, please refer to
    http://msdn.microsoft.com/en-us/library/scsyfw1d(v=vs.71).aspx

    Have a nice day!
    Kristin

    We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.

    Click
    HERE to participate the survey.

  • RELEVANCY SCORE 4.39

    DB:4.39:Interface Implementation df


    what's the difference between interface inheritance and interface implementation...

    DB:4.39:Interface Implementation df

    what's the difference between interface inheritance
    and interface implementation...They go hand in hand. Inheritance is when you declare you will support an interface and implementation is when you do it.

  • RELEVANCY SCORE 4.39

    DB:4.39:Difference j9


    difference between abstract class and interface

    DB:4.39:Difference j9

    @OP You can see by the blatant obviousness and boring repetitiveness of these answers that this is a frequently asked question.

  • RELEVANCY SCORE 4.32

    DB:4.32:Difference Between Inheritance And Abstract Class 9s


    difference between inheritance and abstract class

    DB:4.32:Difference Between Inheritance And Abstract Class 9s

    There was never an episode of Blackadder where he tried to con his aunt out of an abstract class

  • RELEVANCY SCORE 4.32

    DB:4.32:Please Suggest 7p


    public abstract MyClass
    {
    public abstract void method1();
    public abstract void method2();
    }

    public interface MyInterface
    {
    public abstract void method1();
    public abstract void method2();
    }

    What is the difference between these two ?

    DB:4.32:Please Suggest 7p

    What exactly is your question? Are you trying to understand the difference between an abstract class and interface?

  • RELEVANCY SCORE 4.32

    DB:4.32:Difference Between Conversion And Interface 9f



    hi

    Difference between conversion and interface

    DB:4.32:Difference Between Conversion And Interface 9f


    Conversion is one time process. Interface is periodic process.

    Thanks,

    SKJ

  • RELEVANCY SCORE 4.32

    DB:4.32:Abstract Class Or Interface ? 11


    can any one tell me the difference between an abstract class an an interface. which is more useful ?

    DB:4.32:Abstract Class Or Interface ? 11

    You could also try searching this site for your question. It has been discussed in other threads as well (I posted a simialar (how do you spell that?) question).

  • RELEVANCY SCORE 4.31

    DB:4.31:Inter Face And Abstract Class c3


    hi
    can u please tell me the difference between interface and an abstract class? In which situations they will be usefull.
    thank u
    shyam

  • RELEVANCY SCORE 4.30

    DB:4.30:Difference Between Abstact Class And Interface fk


    hi

    i am new in java.

    plz tell me abstract class support which type of polymorphisam and
    interface support which type of polymorphisam
    plz explain

    bye
    siva

    DB:4.30:Difference Between Abstact Class And Interface fk

    There's only one type of polymorphism.

    Does that make it mono-polymorphism? ;)

    Indeed - do a search for the forums.

    The short answer is that both abstract classes and interfaces define required method signatures for subclasses that extend/implement them, but abstract classes can have implementation for some or all methods that are not abstract; interfaces have no implementation whatsoever for any methods.

    %

  • RELEVANCY SCORE 4.26

    DB:4.26:Abstract Class And Interface 97


    is it any differences between abstract class and interface?

    DB:4.26:Abstract Class And Interface 97

    And of course you [url http://onesearch.sun.com/search/developers/index.jsp?col=devforumsqp_name=Java+Programmingqp=forum%3A31qt=%22+differences+between+abstract+class+and+interface%22] searched first....

    Mike

  • RELEVANCY SCORE 4.25

    DB:4.25:Diff. Between Interface And Abstract Class 8j


    hi,
    Can any one tell me about diff between interface and abstract class in practical way.advanced thanks for ur response.
    -PVMVS

    DB:4.25:Diff. Between Interface And Abstract Class 8j

    An interface is a way to specify a set of abstract methods that you want a class to implement. The big deal is that the compiler will check that the methods are in fact provided by the class.

    Interfaces almost always represent a view that has nothing to do with the class hierarchy. It could for example be a specific way to access data, like an iterator. Iterators have seldom anything to do with the logical class design. It's just a common way to iterate through the elements of any class.

  • RELEVANCY SCORE 4.25

    DB:4.25:Difference B/W Abstract &Amp; Interface jm


    Anyone tell me what is Difference B/w abstract interface. because i m very confiuse.
    plz tell me

    DB:4.25:Difference B/W Abstract &Amp; Interface jm

    Anyone tell me what is Difference B/w abstract
    interface. because i m very confiuse.
    plz tell meNo doubt you're very confused, seeing how you post this kind of vague-ness.
    http://forum.java.sun.com/thread.jspa?threadID=734360

    Maybe this is the wrong field for you. Just maybe.

  • RELEVANCY SCORE 4.24

    DB:4.24:Difference Between Abstract Classes Vs Interface 77


    Hi,
    Can u pls mention all the differences between Abstract Classes and Interface.? I've mentioned the differences I've known here.

    Known Differences:
    ------------------
    (*) An interface cannot implement any methods, whereas an abstract class can.
    (*) A class can implement many interfaces but can have only one superclass

    Can U pls mention at what situation(practical situation) we've to go for abstract class or Interface?
    Tell me the situation when we have to go for abstract class?
    Tell me the situation when we have to go for interface?

    Please Reply me
    Thanks Regards
    Venkatesh

  • RELEVANCY SCORE 4.24

    DB:4.24:Interface And Abstract Class dd


    what is the difference between interface and Abstract class?
    What are the situations we have to go for interface and Abstract class?

    DB:4.24:Interface And Abstract Class dd

    Neither an abstract class nor an interface can be instantiated (meaning you cannot create the object directly with the "new" keyword). They are both similar in that they have abstract methods. (Technically, you can create an abstract class with no abstract methods, but I would question the utility of making that class abstract in the first place).

    The two main differences are the following:

    Implementation: An abstract class can implement methods, since it is a class. An interface can never implement any methods, it only declares their signatures.Inheritance: A given class can implement an unlimited number of interfaces. A class can only extend one class. In general, I use the following rules of thumb when deciding (other developers may have differing opinions):

    Given the choice, use an interface. Since you can implement an unlimited number of interfaces, they are not as restricted, from a class hierarchy perspective. If you have several classes with the same instance (class) variables declared and several methods that all accomlplish the same thing (normally, they will even have segments of code copy-pasted between classes), then re-factor the common variables and code into an abstract class. When using interfaces, always consider delegation. Delegation is something like the following:interface IFoo {
    abstract public void bar();
    }

    public class FooDelegate {
    final public void bar() {
    // Default implementation goes here
    }
    }

    public class FooImpl implements IFoo {

    final public void bar() {
    new FooDelegate().bar();
    }
    }

    The advantage of delegation is that you can write a "helper" that contains the implementation, and then the classes that actually implement the interface can simply use the helper (e.g., delegate the implementation to another class).

    - Saish

    "My karma ran over your dogma." - Anon

  • RELEVANCY SCORE 4.24

    DB:4.24:What Is The Difference Between Abstract Class And Interface jf


    Hi,
    Can you please tell me the differences between Abstract class and Interface.
    In which scenarios we have to use Abstract class and in which scenarios should use Interface.

    Thanks and Regards
    Kranthi

    DB:4.24:What Is The Difference Between Abstract Class And Interface jf

    http://stackoverflow.com/questions/761194/interface-vs-abstract-class-general-oo

  • RELEVANCY SCORE 4.22

    DB:4.22:What Is The Difference Between Abstract Class And Interface af


    hi,recently i went for an interview they ask me what is abstract class ,interface and its difference
    I said abstract class contain abstact method ,abstract method is a method with no body.Abstract class cannot be instantiated.Abstract class is a base class it required derived class for the implementation of method.
    Interface is a syntactical contract that all derived class should follow
    it define properties ,method,events which are known as member of interface.
    Then They asked me what is the difference between them. I said
    abstract class interface
    1.abstact class can implement method 1.interface cant
    2.abstact class can contain constructor, 2.interface cant
    destructor
    3.abstract class cannot support multiple 3.interface support
    inheritance
    etc
    Then they said some different answer I said dont no.
    Then they ask me when i should make abstract class for an project and when
    i should make interface.
    I said if suppose there is two class which must be having method with different logic then we sholud make abstract class.
    and if suppose we have two class having method .with different logic then we can make interface .
    Am i correct with my explaination.if not correct me .please provide me that when should we create abstract class and interface and what is difference .please help me

    DB:4.22:What Is The Difference Between Abstract Class And Interface af

    I would focus the answer on the distinction that you cant add an abstract class to an existing class like you can an interface.

  • RELEVANCY SCORE 4.19

    DB:4.19:Java Interfaces 1a


    Java allows to put 'abstract' keyword while declaring an interface, but by definition interfaces are support to be abstract, so whether there is any specific meaning of declaring an interface abstract. I mean whats the difference between an interface and an abstract interface?

    DB:4.19:Java Interfaces 1a

    No difference whatsoever. I believe the "abstarct" keyword in interfaces is an ingheritance from previous versions

  • RELEVANCY SCORE 4.18

    DB:4.18:Difference Between Interface And Abstract Interface 9j


    Hi Guy's,

    Any one Can Help me why the servlet 2.3 introduce the abstract interface.Is there any particular reason.

    bez,I didn't find any abstract interface in servlet 2.2.

    with
    babu

    DB:4.18:Difference Between Interface And Abstract Interface 9j

    I'm agreeing with ur point but I'd like to know why they have Mentioned abstract interface in servlet 2.3 Spec.Is there any reason.

    with
    Babu

  • RELEVANCY SCORE 4.13

    DB:4.13:Difference B/W Abstract &Amp; Interface dx


    Anyone tell me 4 difference b/w abstract class and interface
    plz help me

    DB:4.13:Difference B/W Abstract &Amp; Interface dx

    Asking once is enough.
    http://forum.java.sun.com/thread.jspa?threadID=734361

  • RELEVANCY SCORE 4.13

    DB:4.13:What Is The Main Diffrence Between Abstractclass And Interface? 87


    Hi Could anyone please explain me about main difference of abstractClass and Interface.And please give me one real Time scenario Ex:like I have requirement like Library module---Can I take the Library as an interface. I know the basic differences of interface and abstract class.

    DB:4.13:What Is The Main Diffrence Between Abstractclass And Interface? 87

    If there is a easier relation ship between the class then we can go for abstract class.Let take the example..Abstract Class:abstract class Mammals (It may be a HumanBeing or Animal){Eye(){Can set with two eyes;}abstract legs(); // we cant define the method. So it should be a abstract. Because human has two legs where as animals have four legs.}Interface:Completely different class has a same behaviours.Flyer (behavior)Bird Airplane SupermanHere three class have a same behaviour (flyer) but different implementation .

  • RELEVANCY SCORE 4.13

    DB:4.13:What Is The Difference Between An Abstract And An Interface Class? pk


    can anyone enlighten me on this, what is the difference between an interface and an abstract class? When should i use an interface instead of a class and vice-versa? thanks!

    DB:4.13:What Is The Difference Between An Abstract And An Interface Class? pk

    public class Test extends MyClass implements MyInterface {
    public Test() {
    someAbstractMethod();
    someInterface();
    someMethodInAbstractClass();
    super.someMethodInAbstractClass();
    }
    public static void main(String[] args) {
    Test foo = new Test();
    }
    public void someAbstractMethod() {
    System.out.println("someAbstractMethod() in Test");
    }
    public void someInterface() {
    System.out.println("someInterFace() in Test");
    }
    // public void someMethodInAbstractClass() {
    // System.out.println("someMethodInAbstractClass() in Test");
    // }
    }

    abstract class MyClass {
    public void someMethodInAbstractClass() {
    System.out.println("someMethodInAbstractClass() in MyClass");
    }
    public abstract void someAbstractMethod();
    }
    interface MyInterface {
    public void someInterface();
    }Run once, uncomment code, run again, compare output

  • RELEVANCY SCORE 4.10

    DB:4.10:Bpm.......? 17



    Hi,

    I am newbie to XI and little bit confused with the Configuration part of reciever determination and Interface determination of IDOC XI FIle scenario.

    I have created three message interfaces,two message mappings.How the reciever and interface determination is done between IDOC,IDOC abstract interface and BPM?

    What is the difference between Standard and Extended Reciever and interface determinations in Xi configuration?

    Points will be rewarded for the best compilation.

    Thank you.

    DB:4.10:Bpm.......? 17


    Hi,

    Am not sure why you are using a bpm here.

    Anyways, in this scenario, you would need to use 3 message interfaces.

    1 inbound async interface (for the file system)

    2 abstract async interface w.r.t the bpm.

    1 message mapping, to transform the idoc structure to file structure.

    And hence,1 interface mapping.

    In the configuration, you need to configure the follwing:

    2 receiver determinations.

    (1 receiver is the BPM, sender being the r/3 system and the other receiver is the File, sender being the BPM)

    2 interface determinations.

    iWhat is the difference between Standard and Extended Reciever and interface determinations in Xi configuration?/i

    Standard receiver determination is used when we need to decide upon a receiver based on a condition.

    When we need to send the same message to multiple receivers based on a single condition, we may have to use enhanced receiver determination.

    In enhanced receiver deter. we need to specify a IM that does the job of finding the receivers dynamically.

    Regards,

    Smitha.

  • RELEVANCY SCORE 4.06

    DB:4.06:Abstract Inteface 87


    What is the difference between Abstract interface and interface ?
    if there is no difference,why ServletRequest ,etc are abstract interface.
    Thanks
    Selva

    DB:4.06:Abstract Inteface 87

    SelvaBalaji wrote:
    in the eclipse have opened the interface.and where did eclipse get it from? Remember that it doesn't really matter at all and so we should probably spend our time learning more useful stuff.

  • RELEVANCY SCORE 4.05

    DB:4.05:Re: Difference Between Abstract Class And Interface. f3


    Thanks, jverd. I have got it.

    George

  • RELEVANCY SCORE 4.02

    DB:4.02:Abstact Class And Interface s9


    Hi,

    Any One Can Let me know the exact diff. Between the Abstract class and Interface.

    With
    BAbu

  • RELEVANCY SCORE 4.02

    DB:4.02:Abstract Class Vs Interface And Importance Of Using xm



    Hi All,

    I want to know what is the difference between Abstract class and Interface.

    and what is the importance of using them.

    Moderator message: please search for available information/documentation.

    Edited by: Thomas Zloch on Sep 27, 2011 1:55 PM

    DB:4.02:Abstract Class Vs Interface And Importance Of Using xm


    Please refer to this thread, already this is discussed in forums

    [ABAP Objects.. Abastract Interface Class;

    Thanks

    Pavan

  • RELEVANCY SCORE 4.02

    DB:4.02:Why Interface?Differnce Between Interface And Abstract Class d3


    why we go for interface? what is the difference between interface and abstract class?

    can anyone plz explain with clear picture.

    DB:4.02:Why Interface?Differnce Between Interface And Abstract Class d3

    Look at his profile. He's nothing but a homework dumper anyway. Someone to be ignored.

  • RELEVANCY SCORE 4.02

    DB:4.02:Differance Between Abstract Class And Interface 7s


    Whats the main differance between abstract class and Interface and where I can use abstract class and where I can use Interface

    DB:4.02:Differance Between Abstract Class And Interface 7s

    Refer to
    http://www.javaworld.com/javaworld/jw-09-2001/jw-0921-interface.html

  • RELEVANCY SCORE 3.99

    DB:3.99:Servlet Mapping x1


    HI,

    1. I would like to know about the concept of Servlet mapping.
    Can any 1 help me out.

    2.Wats the Difference between Abstract and Interface

    waiting for response
    Sundar

    DB:3.99:Servlet Mapping x1

    Here you go: http://www.catb.org/~esr/faqs/smart-questions.html#homework

    -slj-

  • RELEVANCY SCORE 3.98

    DB:3.98:Interface Vs Abstract Class 81


    hello
    what to use when between interface vs abstract class?
    and which one is better for decoupling and different version on software.
    regardsIt's Me

    DB:3.98:Interface Vs Abstract Class 81

    For a detailed discussion on this see:
    Abstract Class vs InterfaceJohn Grove - DSS, Senior Software Engineer

  • RELEVANCY SCORE 3.98

    DB:3.98:Difference From Design Perspective 9f


    Hi,
    Can nybody tell me the difference between abstract class and interface from design point of view. This questions waz asked 2 me in an interview.

    Tx.

    Naseem Khan

    DB:3.98:Difference From Design Perspective 9f

    Well. if you really need to know the details check
    out page 118 of the Java Language Spec. The summary
    is:

    - more than one interface can be implemented by a
    class.
    - an abstract class can contain implementation.That is not the big difference, but one will see it if one contemplates on this a little.

  • RELEVANCY SCORE 3.98

    DB:3.98:Re: Abstract Class Vs Interface Difference jc


    While this is by no means complete, the major
    differences between an interface and an abstract
    class with all abstract methods is that you don't
    have to create an implementation for the abstract
    methods in a class that extends the abstract class.Yes you do; unless the extending class is also abstract.

    You do have to implement all methods in an
    n interface. Also you can use access modifiers other
    than public in an abstract class, while interface
    methods must always be public. public or package-private?

    If you don't know why either of these things would be useful then you
    probably don't care, and could just use an interface.And seeings as people are answering here desipte the laziness; abstract classes can also have implemented methods, and member variables. Interfaces cannot.

    DB:3.98:Re: Abstract Class Vs Interface Difference jc

    While this is by no means complete, the major
    differences between an interface and an abstract
    class with all abstract methods is that you don't
    have to create an implementation for the abstract
    methods in a class that extends the abstract class.
    You do have to implement all methods in an
    n interface. No.

    The rules for what must be implemented are the same regardless of whether it's a class or an interface.

  • RELEVANCY SCORE 3.98

    DB:3.98:Abstract Class Vs Interface ? 9d


    hi all,

    can anybody help me.

    if i have an abstract class (full of abstract method definitions) and an interface(having same definitions).

    Now the question is in which situation we go for an ABSTRACT CLASS with full of abstract method definitions and in which situation we go for an INTERFACE.

    and other differences between ABSTRACT CLASSES and INTERFACES except Multiple Inheritence ?

    DB:3.98:Abstract Class Vs Interface ? 9d

    Hi,
    All the variable inside the interface are static and final(You can't change it).While in case of abstract class it is not so. And in abstract class you can have concrete method also while in interface all the method must be non concrete So its depends on your requirement.

    Regards,
    Alok

  • RELEVANCY SCORE 3.98

    DB:3.98:What Is The Main Difference Between Interface And Abstract Class 37


    Hi ,

    Please help on this ..

    Regards,
    vij

    DB:3.98:What Is The Main Difference Between Interface And Abstract Class 37

    All the methods declared inside interface should be abstract

    All the methods declared for an interface are abstract, by definition.

    but in case of abstract class at least one method should be abstract

    No. An abstract class is not required to have any abstract methods. It's not even a "should".

    Abstract class must be extended abstract ()
    methods generally contain only declaration part
    without definition part.
    No "generally" about it, as there are no exceptions. Abstract methods do not have a declared body, by definition.

    ~

  • RELEVANCY SCORE 3.95

    DB:3.95:Interface/Conversion m8



    what is the difference between interface and conversion

    DB:3.95:Interface/Conversion m8


    Actually conversion means from non-sap to sap (one way communication)

    Interface means from non-sap to sap as well as sap to non-sap (Two way communciation)

    and interface can used in sap to sap scenarios also.

    Madhavi

  • RELEVANCY SCORE 3.92

    DB:3.92:Serialize And Sequential Files. k8


    Hi all :)
    This may be a little abstract question:
    Is there any difference between any sequential file and a class file which implements the Serializable interface?Or can it be called a sequential file if a .class implements the Serializable interface?
    Thanx!

  • RELEVANCY SCORE 3.90

    DB:3.90:Difference Between Abstarct Class And Interface 7j


    HI,
    Here is a simple one for the gurus but quite important for me.

    What is the difference b/w an Interface and an abstract class?
    Why do we need each one of them?
    I would appreciate if you people can give examples of each so that I amy understand fully

    Thanks in advance...

    DB:3.90:Difference Between Abstarct Class And Interface 7j

    Sorry about the formatting, this was my first attempt at using [ code ] brackets...

  • RELEVANCY SCORE 3.89

    DB:3.89:Abstract Classes And Interfaces kp


    I am kinda new to Java but have been studying frequently. I have a question that is probably very simple: What is the difference/advantage between an abstract Class and an Interface?

    DB:3.89:Abstract Classes And Interfaces kp

    Search the forum. Here's a topic that addresses it:
    http://forum.java.sun.com/thread.jsp?forum=31thread=273324

  • RELEVANCY SCORE 3.87

    DB:3.87:Abstract And An Interface ak


    Hi there,
    Can anybody please help me.I need to know the difference between the abstract and an Interface.Please explain me with a simple example.Thanks in advance.

    DB:3.87:Abstract And An Interface ak

    NJSun wrote:
    An abstract class is a class which may have the usual flavors of class members (private, protected, etc.), but has some abstract methods.Minor correction: An abstract class usually has abstract methods, but is not required to.

  • RELEVANCY SCORE 3.86

    DB:3.86:Abstract Class And Interface mc


    From the design perspective what is the difference between Abstract class and Interface.
    If we are providing design, for a system. When should we use abstract class? and when should we use interface.

    DB:3.86:Abstract Class And Interface mc

    And,
    you can only "extends" one abstract class;
    but "implements" several interfaces.

  • RELEVANCY SCORE 3.85

    DB:3.85:Use Of An Abstract Keyword 37


    Hi all , I want to know about

    1.the usage of an abstract keyword.

    2.Difference between abstract and interface

    3.When to use abstract keyword.

    DB:3.85:Use Of An Abstract Keyword 37

    Hi all , I want to know about Give it a try yourself first, post it here and you get feedback.

  • RELEVANCY SCORE 3.85

    DB:3.85:Interface &Amp; Abstract Class d3


    1whats the basic difference between an interface and an abstract class?
    when should one be using an interface or an abstract class?

    2whats the difference between method overriding and method overlaoding?
    does both of them has any relation with the instance of te class implementing them?

    DB:3.85:Interface &Amp; Abstract Class d3

    http://www.google.com/search?q=java+interface+%22abstract+class%22

    http://www.google.com/search?q=java+method+overloading+overriding

  • RELEVANCY SCORE 3.85

    DB:3.85:What Is The Difference B/W Abstract Class And Interface j9


    Hi everybody!
    I'm little confused abt the difference b/w abstract class and interface. Plz help me in this regard.
    Bye
    Mustafa

    DB:3.85:What Is The Difference B/W Abstract Class And Interface j9

    You've got a lot of postings describing the semantic differences, here's one that gives you a practical difference: use interfaces to define policy, abstract classes to define mechanism.

    Assuming that got a big "huh?" ...

    An interface defines a set of methods, which I think of as "capabilities." For example, java.util.List defines methods to add/remove/retrieve items to a list. Any object that implements that interface is saying that it has the capability to maintain items in a list. However, it doesn't say anything about how that object is implemented; perhaps it uses an array, perhaps a linked list.

    By comparison, java.util.AbstractList defines at least part of the mechanism used to implement the List interface. It still leaves some of the implementation open to the programmer, but handles a lot of the details common to all lists.

    By keeping this practical definition in mind, I'm not tempted to use an abstract class in place of an interface. Instead, I limit abstract classes to places where there's common implementation -- in other words, they become a refactoring tool.

    One example: as I've started to develop Swing apps, I find that I'm implementing a lot of dialogs. Since I want a common look and feel to my dialogs, there's a lot of code that's common. However, since each dialog has a separate purpose in life, there's also a lot that differs. So I implemented an AbstractDialog class that handles common operations such as UI decorations.

    Now, I could have implemented this as an instantiable class, which would have methods that are overridden by subclasses. But I went with an abstract class for two reasons: (1) there's no reason to instantiate the base dialog, and more important, (2) by defining certain methods as abstract, I force the subclass into providing implementations, thus eliminating bugs due to laziness.

    One last comment: this example defines very little in the way of policy, so it's clearly a candidate to be an abstract class. You may wonder what to do about objects that aren't so clear, but I've found that there are very few of these. In my version of a good OO design, objects either define policy or mechanism, but almost never both.

  • RELEVANCY SCORE 3.85

    DB:3.85:Diffrence Between A Interface And A Abstract Class? f7



    Hi OO ABAP Gurus

    Please clear below point to me.

    Diffrence between a Interface and a abstract class?

    Many thanks

    Sandeep Sharma..

    DB:3.85:Diffrence Between A Interface And A Abstract Class? f7


    Interface:

    All the methods of the class ARE UNDEFINED. You need to implement the interface in a class and give the method definition now. In other words INTERFACES just have the declarations no definitions.

    Abstract Class:

    All the methods which are defined for the class may have the definition or may not. Say we have 3 methods defined for this particular abstract class but only 2 have the definition and 1 does not have the definition. Then it becomes the abstract class.

    So, every Interface is a abstract class but not every abstract class is interface.

  • RELEVANCY SCORE 3.84

    DB:3.84:Interface And Abstract Class Difference 18


    An interface can be used in such a way that we don't know the class of object assigned to a reference of that interface type until runtime. Can we use the abstract class in a similar way too?

    The difference between an abstract class and interface can be listed as
    1. Interface can not have implementation of any method
    2. The usage of interface and class is one other difference
    3. What other differences we have?

    DB:3.84:Interface And Abstract Class Difference 18

    941767 wrote:
    Here we have some more difference...Differences that mean nothing to an experience professional programmer.

  • RELEVANCY SCORE 3.84

    DB:3.84:Difference Between Pure Abstract Class And Interface? 89


    hi,
    i just want to know the difference between pure abstract class(as same as interface- no implementation of methods) and interface

    Thanks,

    DB:3.84:Difference Between Pure Abstract Class And Interface? 89

    A very nice and detailed article on this code project link (posted by Magnus).

  • RELEVANCY SCORE 3.81

    DB:3.81:Regarding Abstract Interface sa


    Hello,What makes the difference between the Normal Interfaces and Abstract Interfaces. Is there any technical differences between these two interfaces.Thank you

    DB:3.81:Regarding Abstract Interface sa

    HIAbstract message interface donu2019t have a direction and arenu2019t implemented in an application system. We use them to define the process signature of an integration process.These are also called as hidden Interfaces.The Message interface is the highest level representation of XML meta data. It has two important attributes: mode (Synchronous or Asynchronous) and direction (inbound or outbound). For Business processes, Abstract interfaces are used; these have a mode, but no direction. oReferences fault message types for exception handlingoContext objects can be assigned.oWSDL representation available for exportoStarting point for Proxy generation (ABAP and Java).cheers

  • RELEVANCY SCORE 3.80

    DB:3.80:Re: Different Between Abstract Class And Interface 77


    any one can please tell me Difference between
    abstract class and interface. From a typing perspecitive there's no difference (you can declare variables of both). The only difference in principle is that an abstract class also can have concrete methods so it allows you ti inherit implementation along with the type. You can only inherit from one class but from as many interfaces you whish.

    Which one is best ?The short answer is that interface is best.

    DB:3.80:Re: Different Between Abstract Class And Interface 77

    Hi,please kindly help meWell, maybe if you'd post an actual question...

  • RELEVANCY SCORE 3.78

    DB:3.78:Re: Difference Between Abstract Class And Interface 7k


    See reply #44 and then please find something more useful to do.

    DB:3.78:Re: Difference Between Abstract Class And Interface 7k

    Passionate_Java_Lover_Vijay wrote:
    hi tigers,
    i am very new to java.
    i have a doublt iin collection.
    at wht situation what interface wil be best than other.

    where should i use List Set, Map and all.
    Advance thanks 2 guys who help me.

    Thanks
    ThinkGodJebus. Are you for real? Get a grip will you

  • RELEVANCY SCORE 3.77

    DB:3.77:Difference Between Interface And Abstract Interface 8a


    What is the difference between the following?

    interface Sample{

    }and

    abstract interface Sample{

    }Please explain it with an example.

    DB:3.77:Difference Between Interface And Abstract Interface 8a

    An all the interface's methods are public and abstract, even if you don't declare them as such. And all it's variables are public, static final, even if you don't declare them as such.

  • RELEVANCY SCORE 3.77

    DB:3.77:What Is The Difference Between Abstract And Interface? d8



    and pls tell me how to know tat

    wen to use static and instance

    DB:3.77:What Is The Difference Between Abstract And Interface? d8


    Abstract class can have single inheritance and Interface can have multiple inheritance.

    Class can have abstract method, which implementation not done itself and subclasses can do. it means class can partial abstract but not in case of interface.

    Kind Rgds

    Ravi Lanjewar

  • RELEVANCY SCORE 3.76

    DB:3.76:Abstract Class And Interface 18


    what is the difference between abstract class and interface

  • RELEVANCY SCORE 3.75

    DB:3.75:Abstract? Interface? dm


    Hello! Can anybody explain me the difference between abstract classes and interface? when should i use them? Can you please give me examples?

    Thank you in advance!

    DB:3.75:Abstract? Interface? dm

    *** Abstract:

    Abstract classes are classes which are not designed to be used by the programmer. They simply enforce the declaration of certain methods on any class which subclasses them. Abstract classes can contain method declarations and instance variables.

    An example would be a very simple driving game, which offers a choice of different cars. Each car moves in the same manner, acceleration, etc. The only difference is the graphic which is used to display each car on screen. For this implementation, it would make sense to have an abstract class 'Car' which defines all the methods such as getSpeed, getDirection, setSpeed, setDirection, and so on. Its one abstract method would be getGraphic. The Car class cannot define this method since it models the 'general case' car, and so does not know what graphic is appropriate for each car.

    abstract class Car {

    /**
    * Define all the methods which are appropriate for each Car object
    */
    public int getSpeed() {
    return speed;
    }

    public void setSpeed(int i) {
    speed=i;
    }

    //etc

    //declare the abstract method
    public abstract Icon getGraphic();
    }Now you could subclass the Car class for a particular Car object:
    public class Mini extends Car {
    public Icon getGraphic() {
    return new ImageIcon("Mini.gif");
    }
    }To summarise, abstract classes are useful if you have a set of similar objects which have most of the same properties, but some method(s) are only appropriate for each individual object.

    *** Interface:

    Interfaces are useful when you need to disguise your object(s) as another type of object. By implementing the interface, the VM can recognise this.

    Interfaces differ from abstract classes in that you must write all the functions yourself. They provide no properties or methods in the base class, whereas abstract classes do.

    I hope this helps, but you would probably be best to scour the java tutorial for this topic for better examples.