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RELEVANCY SCORE 6.35
DB:6.35:Abstract Class 13
Difference between abstract class and interface
use of abstract classDB:6.35: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
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RELEVANCY SCORE 5.25
DB:5.25:Difference j9
difference between abstract class and interface
DB:5.25:Difference j9
@OP You can see by the blatant obviousness and boring repetitiveness of these answers that this is a frequently asked question.
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RELEVANCY SCORE 5.25
DB:5.25:Regarding The Abstract And Interface km
hai,
I am new to java programmingI 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:5.25: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
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RELEVANCY SCORE 5.19
DB:5.19: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 applicationDB:5.19: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.
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RELEVANCY SCORE 5.18
DB:5.18:Difference Between Abstract Classes And Interfaces And When To Use Each a1
Hi,
I want to know the exact implementation differences between an abstract classes and Interfaces.
When would we use each of them..
Its seems that each does the same kind of functionality...but we need to just extend an abstract class in one and implement an Interface in another.Do let me know.
Thanks,
RaviDB:5.18:Difference Between Abstract Classes And Interfaces And When To Use Each a1
Hi,
I want to know the exact implementation differences
between an abstract classes and Interfaces.
When would we use each of them..
Its seems that each does the same kind of
functionality...but we need to just extend an abstract
class in one and implement an Interface in another.Do let me know.
Thanks,
RaviHi Ravi,
A class must be declared abstract if one or more of its method is abstract. In case of an Interface, ALL the methods MUST be abstract. As java does not support multiple inheritence, Interface comes handy. In java, a class cannot extend from more than one class. To incorporate multiple inheritance, one can extend a class from another class and implement interface.public TestClass extends AbsClass implements Inter {
}Thanks,
Hope this helps,
Karthick -
RELEVANCY SCORE 5.18
DB:5.18:Abstract Classes Interface ? kd
Hello
I wonder if anyone could help me to stright out my big questionmark regarding Abstract classes and Interfaces by answering following questions.
1) When and why should I use Abstract classes, an real life example would be very appreciated. I have been programming for a while but I have never created an Abstract class.....
2) Whats the difference in using Abstract classes and an interface when both of them explains whats are needed. Is an interface just an design pattern that points out which methods that are required so this particulare class should be working or correctly or?
Thanks!
Regards /D_S
DB:5.18:Abstract Classes Interface ? kd
Please search the forum or google. This has been asked, and answered about 8928911 times before.
Kaj
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RELEVANCY SCORE 5.13
DB:5.13:Abstract Class Vs Interface 9d
Hi
I was just wondering what is the advantage of using an abstract class over interface. In what situation, using an abstract class is more suitable than using interface? and vice versa?
DB:5.13:Abstract Class Vs Interface 9d
This question has been asked and answered a million times. For instance, see this thread: http://forum.java.sun.com/thread.jsp?forum=31thread=352322
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RELEVANCY SCORE 5.11
DB:5.11:Abstract Class And Interface 97
is it any differences between abstract class and interface?
DB:5.11: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
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RELEVANCY SCORE 5.03
DB:5.03:Re: Does Abstract Class Really Faster Than Interfaces mm
938864 wrote:
Abstract class vs interface is common question and I have been hearing from time and time that abstract class are slightly faster than interfaces Please cite a reference to this.P.S. You will not notice any difference so who cares.
DB:5.03:Re: Does Abstract Class Really Faster Than Interfaces mm
In what respect have I not just answered exactly that question?
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RELEVANCY SCORE 4.99
DB:4.99: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
KranthiDB:4.99:What Is The Difference Between Abstract Class And Interface jf
http://stackoverflow.com/questions/761194/interface-vs-abstract-class-general-oo
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RELEVANCY SCORE 4.98
DB:4.98: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:4.98: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
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RELEVANCY SCORE 4.98
DB:4.98: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:4.98:Difference Between Interface And Abstract Class zk
This thread is moved from "JavaServer Pages (JSP) and JSTL" to here.
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RELEVANCY SCORE 4.96
DB:4.96: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
MustafaDB:4.96: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.
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RELEVANCY SCORE 4.94
DB:4.94:Re: Difference Between Abstract Class And Interface. f3
Thanks, jverd. I have got it.
George
DB:4.94:Re: Difference Between Abstract Class And Interface. f3
Thanks, UlrikaJ. I have got what you mean.
George
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RELEVANCY SCORE 4.93
DB:4.93:Abstract Class z3
Hi to all,can any one tel me what are abstract classes and what hapens if i check the ABSTRACT ckeck box while creating a interface in se24(class builder)?
Thanks Regards
Priya
DB:4.93:Abstract Class z3
Thanks Matthew .Thanks Regards
Priya
Edited by: priya latha on Dec 19, 2007 11:43 AM
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RELEVANCY SCORE 4.92
DB:4.92:Difference Between Abstract Interface And Normal Interface za
Hello Friends,
What is the Difference between abstract interface and normal interface?....
DB:4.92: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 4.86
DB:4.86: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:4.86: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.
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RELEVANCY SCORE 4.74
DB:4.74: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:4.74: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
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RELEVANCY SCORE 4.72
DB:4.72: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:4.72: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 4.68
DB:4.68: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...
DebDB:4.68: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.
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RELEVANCY SCORE 4.64
DB:4.64: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:4.64: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
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RELEVANCY SCORE 4.64
DB:4.64: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:4.64:Difference 7x
Another link:
{color:#0000ff}http://forum.java.sun.com/thread.jspa?messageID=9961601{color}db
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RELEVANCY SCORE 4.63
DB:4.63: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:4.63: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
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RELEVANCY SCORE 4.63
DB:4.63: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:4.63: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 4.63
DB:4.63:Difference Between An Interface And An Abstract Class 9f
Hey:
I'm curious, what's the difference between an interface and an abstract class? Thanks.
DB:4.63:Difference Between An Interface And An Abstract Class 9f
"You have an abstract class if you want to implement some of the methods in it, but you do not want users to make instances of the class or do not want to implement all of the methods. Take a look at some of the abstract classes in java.util. Nearly all of the methods are implemented already so that it's far easier to create new data structures than if only interfaces were provided. "
That's what I was looking for. Thanks.
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RELEVANCY SCORE 4.61
DB:4.61:Interfaces And Abstract Classes 8x
Whats the difference between an interface and an abstract class.
DB:4.61: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.
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RELEVANCY SCORE 4.61
DB:4.61:Difference Between Abstract Class And An Interface c3
hi all,
what is the difference between an ABSTRACT CLASS with full of METHOD DEFINITIONS and no implemented methods. AND an interface having the same definitions.
In which situation we use abstract class and in which situation we use interface.
what are the benefits.
Can anybody explain it clearly.
bye
-hariDB:4.61:Difference Between Abstract Class And An Interface c3
http://www.google.com/search?q=java+difference+abstract+interfaceTrying to teach a man to fish, are you?
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RELEVANCY SCORE 4.58
DB:4.58: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,
RamDB:4.58: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.
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RELEVANCY SCORE 4.53
DB:4.53:What Is The Main Difference Between Interface And Abstract Class 37
Hi ,
Please help on this ..
Regards,
vijDB:4.53: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.~
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RELEVANCY SCORE 4.51
DB:4.51:Difference B/W Abstract Class And Interface dx
hi friends,
can anyone plz divulge the differences between abstract class and interface and under what situations can we use these concepts.
thanks
madhusudan.D
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RELEVANCY SCORE 4.48
DB:4.48:Interfaces And Abstract Classes 73
can anyone pls tell me where exactly an abstract class is used and where exactly an interface is to be used.
i think the main difference between an abstract class and an interface is that an interface will have all the abstract methods whereas an abstract class can have one or more abstract methods--- if i am not wrong.
anything to add? -- pls let me know on this....and also how they might be useful for us....
DB:4.48:Interfaces And Abstract Classes 73
The differences are already quoted. In addition of that
the abstract class will come in the class/system hierarchy, but interface will not. -
RELEVANCY SCORE 4.48
DB:4.48: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:4.48: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.
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RELEVANCY SCORE 4.48
DB:4.48: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:4.48: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.
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RELEVANCY SCORE 4.46
DB:4.46:Re: What Is The Difference Between An Interface And An Abstract Class? 1a
8000 views already wow.
DB:4.46:Re: What Is The Difference Between An Interface And An Abstract Class? 1a
filestream wrote:
As the two famous politicians, Jonathan Curry and Larry Craig are wont to say, "Glad I could serve you."Of course, each says it in entirely different situations but we're not here to discuss that. The members of the forums are happy just knowing that we've cleared 1 doubt.Now that you mention it, I take a wide stance in the interface/abstract class issue.
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db: Deconfirmation of Scheduled Line stock
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db: How do I keep my podcast downloads after sync to iPhone with podcast app?
db: CA2000 with try...catch...finally block
db: WAAS solution elements (new stuff for me)
db: Nicht erkennbares Datenbankformat
db: Formating Hard drive
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RELEVANCY SCORE 4.36
DB:4.36: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:4.36:Re: Different Between Abstract Class And Interface 77
Hi,please kindly help meWell, maybe if you'd post an actual question...
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RELEVANCY SCORE 4.36
DB:4.36:Difference B/W Abstract &Amp; Interface dx
Anyone tell me 4 difference b/w abstract class and interface
plz help meDB:4.36:Difference B/W Abstract &Amp; Interface dx
Asking once is enough.
http://forum.java.sun.com/thread.jspa?threadID=734361 -
RELEVANCY SCORE 4.34
DB:4.34: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:4.34: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 4.34
DB:4.34:Abstract Class And Interface 3j
I would covet to recognize at what situation we use abstract class
and when to use interface?With Regards,
Stalin.GDB:4.34:Abstract Class And Interface 3j
http://www.google.com/search?q=abstract+class+interface+site:forum.java.sun.com
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RELEVANCY SCORE 4.34
DB:4.34: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 meDB:4.34: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.
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RELEVANCY SCORE 4.34
DB:4.34:Difference Between Interface And Abstract Class? x1
Hi,
Can u plz explain
at what scenarios we use interface and abstract class.?Thanks,
B.MaruthiDB:4.34:Difference Between Interface And Abstract Class? x1
If you had read the FAQ at the top of the forum home
page you wouldn'y have bothered to ask this
question.Anyways heres the linkRead the question number 13 in this link
http://access1.sun.com/FAQSets/newtojavatechfaq.htmlnice
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RELEVANCY SCORE 4.34
DB:4.34: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:4.34: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 4.33
DB:4.33:Re: Interface m8
Java Glossary : interface vs abstract class
Abstract classes vs. interfaces: When does it make sense to choose an abstract class over an interface?
Abstract classes and interfaces practicum: Move from theory to practice on when to employ abstract classes vs. interfaces
Tech Tips: ABSTRACT CLASSES VS. INTERFACESDB:4.33:Re: Interface m8
I'm still entertained by the fact that some folks will
spell out words like "multiple", "inheritance",
"interface", and "implement", but not "because".:o)LOL!
This kills me - just bcuz.
%
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RELEVANCY SCORE 4.33
DB:4.33: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 interfaceThanks,
DB:4.33:Difference Between Pure Abstract Class And Interface? 89
A very nice and detailed article on this code project link (posted by Magnus).
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RELEVANCY SCORE 4.33
DB:4.33:Java Programming 33
what is the difference between 'abstract' class and 'interface'
DB:4.33:Java Programming 33
Hey, get back in line. Don't jump the queue :)Well I guess I haven't qualified myself for this
year's hunt. Maybe I could get a free-card because I
was always on the Most Arrogant List a few years ago.Ok. I'll be nice. You'll get a free pass.Kaj
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RELEVANCY SCORE 4.33
DB:4.33: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
DavidDB:4.33:Concrete Class ff
Thanks Lady
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RELEVANCY SCORE 4.30
DB:4.30: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:4.30: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
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RELEVANCY SCORE 4.26
DB:4.26:Abstract Class Or Inteface 89
Pls give me some practical example of choosing among abstract class and interface.
DB:4.26:Abstract Class Or Inteface 89
Search these forums using the box on the left. This question is asked about 50 times a week, there are tons of answers around
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RELEVANCY SCORE 4.26
DB:4.26:Difference Between Interface And Abstract Class mj
hello friends give me the difference between interface and abstract class
and link to find java materialThanx
DB:4.26:Difference Between Interface And Abstract Class mj
Hmm... one blank line is preserved
.
.
.
.
.
.
db
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RELEVANCY SCORE 4.25
DB:4.25:Mdb Abstract Base Class And Ejb3 Annotations 1k
I have following scenario where my MDB class extends an abstract class which implements the MessageListener interface.
public abstract class MDBBase implements MessageListener {
public void onMessage(Message message) {
....
processJob(some-params)
}
public abstract void processJob (some-params);
}public class MyMDB extends MDBBase {
public abstract void processJob (some-params) {}
}DB:4.25:Mdb Abstract Base Class And Ejb3 Annotations 1k
I have following scenario where my MDB class extends an abstract class which implements the MessageListener interface.
public abstract class MDBBase implements MessageListener {
public void onMessage(Message message) {
....
processJob(some-params)
}
public abstract void processJob (some-params);
}public class MyMDB extends MDBBase {
public abstract void processJob (some-params) {}
} -
RELEVANCY SCORE 4.25
DB:4.25:Interface Vs Abstract Class sz
Let say that an abstract class has all abstract functions and someone use it instead of interface.
What are the disadvantage and advantages?
I know one that he cannot do multiple inheritance, hence he cannot extends abstract class and use any other parent Class. However, I wish to know more disadvantage/advantages.Looking forward for your input.
--
PS: I know interface cannot have code and abstract class could have code (non-abstract) methods..
DB:4.25:Interface Vs Abstract Class sz
HowToDoIt wrote:
Let say that an abstract class has all abstract functions and someone use it instead of interface.
What are the disadvantage and advantages?
I know one that he cannot do multiple inheritance, hence he cannot extends abstract class and use any other parent Class. However, I wish to know more disadvantage/advantages.Looking forward for your input.
--
PS: I know interface cannot have code and abstract class could have code (non-abstract) methods..An Interface expresses a contract.
A class implementing an interface is saying "I will supply implementations of all methods described in the interface, i.e. methods with those particular signatures"A class can of course implement multiple interfaces, i.e. it is capable of fulfilling multiple contracts.
An Abstract class is used to provide a 'base' implementation of some specific functionality (whether it is described in an Interface or not).
I cannot think of a useful purpose for an abstract class that contains only abstract methods (perhaps it inherits some behavior from its base class)
Usually some methods in an abstract class WILL be implemented, either because they are unlikely to change in child classes, or they provide a guide/example of implementation, or the implemented methods may be defined in terms of some of the abstract methods, this allows classes which extend the abstract class to 'mix in' their behavior with that of the base abstract class.
So Interface and Abstract Class have two distinct and separate purposes.
I hope that is clear?
Just to help with the details, you can put more than just method signatures in an interface, your could for example have in your interface
public interface Face1
{
public static final int x = 3;
}which you would access as:int fred = Face1.x;And you can place a public static class inside of your interface, the methods of which you would access in a similar way, but you should avoid this unless you really know what you are doing.
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RELEVANCY SCORE 4.23
DB:4.23:Use Of Abstract And Interface? k3
when i use Abstract class or Interface.Which one is better?
DB:4.23:Use Of Abstract And Interface? k3
Depends on what you want to do. An interface is more general (in that it doesn't define any actual behavior) and allows you to mimic multiple inheritance (a class can implement any number of interfaces whereas it can only extend one class (abstract or otherwise)). Abstract is good if you have a common base of functionality that all of the implementers will be using.
It's also fairly common to use both (i.e. the interface TableModel and the abstract class AbstractTableModel), so that someone who wants to completely write their own implementation is free to, while someone who wants to just extend or change the standard functionality could do that as well.
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RELEVANCY SCORE 4.23
DB:4.23: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:4.23: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.
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RELEVANCY SCORE 4.22
DB:4.22:C#.Net Difference Between Abstract Class And Sealed Class df
Hi Experts, What is Difference Between Abstract Class And Sealed Class in C#? Thanks.
Knowledge Shared Is Knowledge Gained
DB:4.22:C#.Net Difference Between Abstract Class And Sealed Class df
Hi Geert van Horrik, Thanks.Knowledge Shared Is Knowledge Gained
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RELEVANCY SCORE 4.22
DB:4.22:Difference Between Abstract Class And Interface ? fz
CAN ANY BODY TELL ME THE DIFFERENCE BETWEEN THE ABSTRACT CLASS AND INTERFACE ?
DB:4.22: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 4.22
DB:4.22:Confusion Between Abstract And Interface a8
Hi all,
i'm new to java, can somebody help to explain on abstract and interface method. As i know that abstract or interface does not provide implementation in the superclass and interface class respectively. All the implementation are done in subclass.. why not we use the inheritances and abstract method to solve the problem instead of using the interface... i can't see the difference between the abstract and interface.. can somebody provide me a good example to understand the interface well..p/s: pls correct me if i wrong... ;)
thanksDB:4.22:Confusion Between Abstract And Interface a8
public class abstract Mainclass{
abstract double area();
abstract double meter();
}public class Subclass1 extends Mainclass{
double area(){
return 5+1;
}
}public class Subclass2 extends Mainclass{
double area(){
return 8+10;
}
}Let's say you have
public class abstract AreaClass {
abstract double area();
abstract double meter();
}And then when you are working on your second iteration and you want to use Dimension class for this purpose for your new code but you want to leave the old code alone. If you have made AreaClass an abstract class, this is impossible.
public class AreaDimension extends AreaClass, Dimension {
}will not compile. However if you had defined AreaClass as and interface you can do this:
public class AreaDimension extends Dimension implements AreaClass {
double area() {
return height * width;
}
}Then you can pass this to any method that accepts an AreaClass as a parameter and you can also pass it to any method that takes a Dimension. -
RELEVANCY SCORE 4.22
DB:4.22: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.
--------------------------------------------------------------------------------
DB:4.22:Difference Between Abstract Class And Interface ca
Thanks for your interests...
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RELEVANCY SCORE 4.21
DB:4.21: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:4.21: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 4.20
DB:4.20: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 superclassCan 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
VenkateshDB:4.20:Difference Between Abstract Classes Vs Interface 77
interfaces are implicitly static.
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RELEVANCY SCORE 4.16
DB:4.16:Interface And Abstract Class dc
why we have constructor for abstract class and not for interface,
DB:4.16:Interface And Abstract Class dc
Simpler reason: interfaces have no implementation. Period.
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RELEVANCY SCORE 4.14
DB:4.14:A C Sharp Basic Question! s9
Â
I wonder the difference between the abstract class and the interface!
Someone help me!DB:4.14:A C Sharp Basic Question! s9
 xiaobin700 wrote:
Â
Thanks
Can a method in an abstract class be overload? And how about an interface? -
RELEVANCY SCORE 4.14
DB:4.14:Re: Difference Between Abstract Class And Interface 7k
See reply #44 and then please find something more useful to do.
DB:4.14: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 4.12
DB:4.12:Abstract And Interface? cm
why do we need abstract class?
why do we need interface in java?DB:4.12:Abstract And Interface? cm
Oh please, do some research of your own.
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RELEVANCY SCORE 4.11
DB:4.11: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:4.11: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.
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RELEVANCY SCORE 4.11
DB:4.11:When To Use Abstract Class And Interface? jp
hi,
When to use Abstract class and Interface?
DB:4.11:When To Use Abstract Class And Interface? jp
Thanks for all, i got some clear idea about when to use interface and abstract class.
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RELEVANCY SCORE 4.11
DB:4.11:Abstract Class And Interfaces xz
Hi Recently
I attended a Interview ,Interviewer asked me what is difference b/w abstract and interface.
I cud give answer ,,he said what if abstract class has all abstract methods.in this situation is ther any difference between abstract class and interface..
i said there will be no difference in making all methods abstract and it is similar to interface.the only difference is at one point of time u can have a class can inherit only one abstarct class whereas interface u can have more than one interface....
I want to know is my answer is right r not..please suggest is it correct and if any other ans please do reply
With Regards
Mahender
MahenderDB:4.11:Abstract Class And Interfaces xz
Stepping away from purely technical differences, there are some more fundamental ones.First there is a semantic difference. A base class says that any derived classes have an is a relationship with the base. For example you could have a base class such as Stream because derived classes are streams, but you wouldn't have a base class such as Serializable because you couldn't say that a derived type is a Serializable.Secondly there is the versioning problem. With an abstract base class you can add non-abstract members in future versions without breaking any existing functionality (save for possibly name collisions) because the base class provides the implementation. With an interface you can never add members because you will break any existing implementors. http://gregbeech.com/blogs/tech
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RELEVANCY SCORE 4.08
DB:4.08: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:4.08:Abstract Class And Interface 17
hii 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.
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RELEVANCY SCORE 4.07
DB:4.07:Interface Vs Abstract Class d8
when do we need interface and when abstract class?
DB:4.07:Interface Vs Abstract Class d8
2.All the abstract methods must be overrided and
implemented by the child class.by definition, you can't override a method that has no implementation3.Real Examples:
when we implement the ActionListener interface for
Button click event then we have to override the
actionPerformed method, we dont have any other
chices, so it is a way of forcing the inherited class
to override certain methods.as before, we implement an abstract method. you're not forcing an override, this can't be done, nor would it be a good idea. as discussed at length recently :-)n java you can see all the classes that starts with
Abstract is abstract.not so. there's nothing at all to stop you writing a concrete class named AbstractClass -
RELEVANCY SCORE 4.04
DB:4.04:Abstract Class Vs Interface 9a
Can somebody please explain to me why we need both abstract classes and interfaces? Don't they serve almost exactly the same role? Besides syntax and the possibility of implementing multiple interfaces, is the only difference that an abstract class is allowed to have non-abstract methods?
DB:4.04:Abstract Class Vs Interface 9a
interfaces also may have variables but they have to be declared final. ???
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RELEVANCY SCORE 4.04
DB:4.04: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:4.04: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.
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RELEVANCY SCORE 4.03
DB:4.03:Diference Between Abstract Class And Interface cp
Â
Hi,
Â
I had a doubt on basic concept of interface and abstract class.
Â
I had idea of wht is interface and abstract class but there is case ,can any do justification on these case is
Â
Abstract class is a clas where some methods r defined and some are abstract methods.
Interface is where all methods are abstract .
Â
but what happen if i try to maintaince all methods in abstract class as abstract which is equivalent to interface.?
Â
We go for abstract class if want to extend functionality of class.For interface if we wanna implement a new implementation.
Â
is there any other difference apart from this and other issues if we try to have all methods abstract .
Â
Â
With regards
MahenderDB:4.03:Diference Between Abstract Class And Interface cp
Hi,
Â
Thnx for giving info.Actually iam looking for projct development point of view..In whihc cases i do go 4 developing abstract classes other interfaces -
RELEVANCY SCORE 4.02
DB:4.02: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:4.02:What Is Difference Between Interface And Abstract? 3s
Hi
Take a look on this
http://www.c-sharpcorner.com/UploadFile/yougerthen/104232008193919PM/1.aspx
ReguardsThe complexity resides in the simplicity Follow me at: http://smartssolutions.blogspot.com
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RELEVANCY SCORE 4.02
DB:4.02:Difference ???? xz
What's the difference between an Interface and Abstract class ??????
DB:4.02:Difference ???? xz
Is google broken again?
[http://www.google.co.uk/search?q=What's+the+difference+between+an+Interface+and+Abstract+class] 652,000 hits -
RELEVANCY SCORE 4.00
DB:4.00: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:4.00: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.....
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RELEVANCY SCORE 4.00
DB:4.00: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 fullyThanks in advance...
DB:4.00:Difference Between Abstarct Class And Interface 7j
Sorry about the formatting, this was my first attempt at using [ code ] brackets...
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RELEVANCY SCORE 3.98
DB:3.98:Who Can Tell The Difference Of The Abstract Interface Class? 79
someone ask me that he had a abstarct interface class, such as :
public abstract interface Book{
}
I was comfused, who can tell me why use it?DB:3.98:Who Can Tell The Difference Of The Abstract Interface Class? 79
http://java.sun.com/docs/books/tutorial/java/interpack/interfaceDef.html
Scroll down to the bottom.
Drake
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RELEVANCY SCORE 3.98
DB:3.98: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.
DB:3.98:Difference % Abstract Class And Interface? d3
Thanks JustLee,
I got it now.
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RELEVANCY SCORE 3.98
DB:3.98: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 explainbye
sivaDB:3.98: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.
%
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RELEVANCY SCORE 3.97
DB:3.97:Static Methods In Interfaces 3z
Java cognoscenti,
Anyone know why I can't declare a method as static in an interface, but I can in an abstract class. Surely, semantically it's the same - defering the implementation of a static method, not an abstract class and an interface. By the way, I'm using JDK 1.2.2 if that makes a difference
DB:3.97:Static Methods In Interfaces 3z
Thanks you schapel and dlgrasse.
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RELEVANCY SCORE 3.95
DB:3.95: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:3.95:Java Interfaces 1a
No difference whatsoever. I believe the "abstarct" keyword in interfaces is an ingheritance from previous versions
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RELEVANCY SCORE 3.95
DB:3.95: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:3.95:Differance Between Abstract Class And Interface 7s
Refer to
http://www.javaworld.com/javaworld/jw-09-2001/jw-0921-interface.html -
RELEVANCY SCORE 3.95
DB:3.95: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:3.95: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 3.95
DB:3.95:About Interface In Java 7z
what is basic idea behind the interface and abstract class
DB:3.95:About Interface In Java 7z
Search in this forum. You will find lot of threads discussing the same topic.
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RELEVANCY SCORE 3.94
DB:3.94:Interfaces And Abstract Classes fk
hi,
Can anyone help me regarding the difference between interfaces and abstract classes. What is the advantage of interface over abstract classes and viceversa. Obout the possibities of multple inheritance I know. I found allmost all people are talking some external answers.
Why an abstract class cant we do it with concrete class.
regards,Jayaprasad Viswanathan
DB:3.94:Interfaces And Abstract Classes fk
Abstarct class can never be instantiated. Same as interfaces.
Can be
subclassed.Same as interfaces. -
RELEVANCY SCORE 3.93
DB:3.93:What Is An Interface &Amp; Abstract Class ? zm
hi ,
i am new to java,
pls give the answer for this question,what is an interface abstract class ?
why we go for interfaces and abstract classes?DB:3.93:What Is An Interface &Amp; Abstract Class ? zm
STOP RESURRECTING DEAD THREADS!
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RELEVANCY SCORE 3.92
DB:3.92:What Is The Exact Difference Between Abstract Classes And Interface 7m
What is the exact difference between abstract classes and interface in real scenario???
Plz could you give a practical example???
Thanks
DB:3.92:What Is The Exact Difference Between Abstract Classes And Interface 7m
At least your head doesn't make a plonk sound.Mine just makes a splutchy bursting watermelon type sound.
To the original poster - to make things simple, if there is any doubt about which you should use, use an interface. If the situation calls for an abstract class, you will know that an interface is the wrong choice, because it will be impossible to do what you want to do with an interface.
Drake
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RELEVANCY SCORE 3.88
DB:3.88:Core Java 83
what is differernce between abstract class and interface?
DB:3.88: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 3.87
DB:3.87:Abstract Class And Interface 7x
Hi,
This is ramana, I got a doubt
1. I have one interface
interface Intabs {
abstract void method1();
abstract void method2();
abstract void method();}
2. Iam trying to convert that interface into abstract class like below
interface Intabs {
abstract void method1();
abstract void method2();
abstract void method();}
3. Again iam trying to extend that abstract class into class like below
interface Intabs {
abstract void method1();
abstract void method2();
abstract void method();}
Iam getting errors
Can i do it in multiple steps: Interface------abstract class----- class
DB:3.87:Abstract Class And Interface 7x
Cannot reduce the visibility of the inherited method
from IntabsDerabst1.java
Right. As mentioned, you can't assign weaker access priveleges to inherited methods. If you define a method as "public void foo() {}", the "foo()" method must have at least public access in all subtypes. In your example, your interface methods are public, but you're trying to give them "package-private" (default) access in the abstract and concrete implementation classes.~
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RELEVANCY SCORE 3.86
DB:3.86:What's The Difference Between Abstract Class And Interface? 1z
Dear all,
Can anyone give me some hints about this topic?Thanks.
Leo
DB:3.86:What's The Difference Between Abstract Class And Interface? 1z
Also, you can only extend one class, but can implement many interfaces. I extend a class for true is-a relationships, I use implements like mixins.
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RELEVANCY SCORE 3.84
DB:3.84:Abstract Class Or Interface ? 11
can any one tell me the difference between an abstract class an an interface. which is more useful ?
DB:3.84: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).
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RELEVANCY SCORE 3.84
DB:3.84:Abstract Inteface 87
What is the difference between Abstract interface and interface ?
if there is no difference,why ServletRequest ,etc are abstract interface.
Thanks
SelvaDB:3.84: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 3.84
DB:3.84:Abstract Class And Interface z1
What is most important thing about abstract class and interface.
When to use abstract class and interface.
DB:3.84:Abstract Class And Interface z1
The interface is like an agreement where the class
which implements the interface promises to write the
implementation code for all the functions in the
interface.Same for an abstract class, only, rather than "all the methods" it's "all the abstract methods." Of course, you could turn around and usethat wording for interfaces too, but in that case it means "all the methods" since interfaces' methods are all abstract. -
RELEVANCY SCORE 3.83
DB:3.83: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:3.83: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.
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RELEVANCY SCORE 3.83
DB:3.83:Make Abstract Class With Interface. 39
I want to make an abstract class with methods that need interfacing, but I don't want to make an entire other class for the abstract class to implement. Is there any way to make an abstract class and interface combined into one class with no implementations on that class?
DB:3.83:Make Abstract Class With Interface. 39
if you want a class with no implementations that what you need is an Interface
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RELEVANCY SCORE 3.82
DB:3.82:Interface fd
can any one tell me what is the actual difference between an abstarct class and interface.when do we use interface and when do we use abstract class in real time environment?
DB:3.82:Interface fd
don't encourage this nonsense
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RELEVANCY SCORE 3.81
DB:3.81:Interface And Abstract Class ac
hi all,
A method in an interface consists of access specifiers as public or abstract. what is the difference if the access specifiers for the method is public and abstract.
regards,
priyaDB:3.81:Interface And Abstract Class ac
That is correct. They must be because interface methods must be overridden when subclassed.
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RELEVANCY SCORE 3.80
DB:3.80: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
shyamDB:3.80:Inter Face And Abstract Class c3
just read stuff... why ask?
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RELEVANCY SCORE 3.79
DB:3.79:Interface And Abstract Class ad
Why can't we declare a static method in Interface but it's possible in abstract class?
DB:3.79:Interface And Abstract Class ad
Because an interface is simpler than an abstract class.
Normally you would put a static method like this into a utility class with a private constructor. see the Math class. -
RELEVANCY SCORE 3.77
DB:3.77: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:3.77: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 3.76
DB:3.76: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:3.76:Abstract Class And Interface???? ja
search the forums, lot's of times answered this one has been.
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RELEVANCY SCORE 3.75
DB:3.75: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..?
ThanksbahushekhDB:3.75: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.
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RELEVANCY SCORE 3.74
DB:3.74: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:3.74: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
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RELEVANCY SCORE 3.73
DB:3.73:Abstract Class And Interface Use 1k
hi
i am asking some stupied questions. plz can any one tell me
1) what is interface and abstract class ? one example?
2) when do u go for interface and when do u go for abstract class?
3) what is exact difference between abstraction and encapsulation?thanks in advance
DB:3.73:Abstract Class And Interface Use 1k
Mahaboob wrote:
hii am asking some stupied questions.I agree.
plz can any one tell meHere's a much better idea. You go do some basic research on these questions which have been asked 1,000,000,000 times previously and then tell us what you think. Then we can have a lively discussion about your ideas.
'kay?
And just to get you started in the right direction here's something you can review that will answer part of or all of your questions [_http://java.sun.com/docs/books/tutorial/java/index.html_|http://java.sun.com/docs/books/tutorial/java/index.html]