Interface (Java) & Abstract Class (C++) ?

Posted on 2004-08-26
Medium Priority
Last Modified: 2012-05-05

 Hi Experts,

    This is actually a follow up question of :

  Now I have more idea about interface. Then I am wondering does the "interface" in Java play the same role as the "abstract class" in C++ ?

  Is it true that : " The are multiple (class) inherence in C++, but java can extend only one class. Therefore, the interface actually doing something like "multiple inherence" in C++" ?

   Thanks a lot !!!

Question by:meow00
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LVL 15

Accepted Solution

Javatm earned 600 total points
ID: 11909432
Hi Friend;

The answer to this question that you posted and also this one that you posted :

Is in here : http://www.firstsql.com/java/gotchas/

=-) Read that and that should answer your questions !.

Glad to help . . .
LVL 15

Expert Comment

ID: 11909464
>  Then I am wondering does the "interface" in Java play the same role as the "abstract class" in C++ ?

Answer = True;

> The are multiple (class) inherence in C++, but java can extend only one class.
> Therefore, the interface actually doing something like "multiple inherence" in C++    

Answer = True;

Read the links above for further explanations !

Hope that helps . . .
LVL 35

Assisted Solution

girionis earned 400 total points
ID: 11910306
>  " The are multiple (class) inherence in C++, but java can extend only one class. Therefore, the
> interface actually doing something like "multiple inherence" in C++" ?

You could say that although this is not strictly true. The point of inheritance is to inherit characteristics from the parent class, i.e. bahaviour or state. An interface does not implement any behaviour (although it can have state through its variables) so you must be very careful when you use the term "multiple inheritance" by using interfaces. A better term would be "multipel interfaces inheritance"

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Assisted Solution

Giant2 earned 200 total points
ID: 11910506
Interface in Java tell "only" what the classes implementing this interface must implement.
The intent of abstract class is to provide general functionality (taken from MSDN).

Interface in java do not specify any piece of code. It contains the declaration of the methods.
If you want a similarity with C, you can find in some manner about java interface and declaration of the method in C.

And abstract in C is little similar to abstract in java.

Hope this clarify some doubt, Giant.
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Expert Comment

ID: 11912297
LVL 12

Expert Comment

ID: 11912316
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Expert Comment

ID: 11917755
=-) Always glad to help . . .

Friend : Javatm

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