8
votes
3answers
663 views

Refactoring an existing abstract class and its parameters

I have an abstract class A which declares an abstract method doStuff. Currently there are many classes that inherit from A and implement doStuff. The class' instances are initialized at run-time ...
-3
votes
1answer
316 views

Abstract Class, Interface: difference and use [duplicate]

Possible Duplicate: When to use abstract classes instead of interfaces and extension methods in C#? What is the difference between abstract classes and interfaces in java? And under what ...
8
votes
3answers
1k views

Should I implement an interface directly or have the superclass do it?

Is there a difference between public class A extends AbstractB implements C {...} versus... public class A extends AbstractB {...} AbstractB implements C {...} I understand that in both cases, ...
4
votes
6answers
3k views

What are abstract classes and abstract methods?

I got several explanations but so far I'm not able to understand that what are the abstract classes and methods in Java. Some said it has to do something with the security of the program, other said ...
13
votes
4answers
885 views

Is there a different usage rationale for abstract classes/interfaces in C++ and Java

According to Herb Sutter one should prefer abstract interfaces (all pure virtual functions) to abstract classes in C++ to decouple the implementation as far as possible. While I personally find this ...
7
votes
4answers
2k views

Abstract methods vs instance variables for reusable objects

I have quite a bit of Java code that I'm re-working to be re-used. The problem is that there are many pieces that are project specific so there are ends up being a higher level of coupling between ...
1
vote
2answers
2k views

What other reasons are there to write interfaces rather than abstract classes? [duplicate]

Possible Duplicate: When to use abstract classes instead of interfaces and extension methods in C#? When I read and looked at codes using Abstract classes, I was able to justify it because ...
15
votes
9answers
15k views

Why should I declare a class as an abstract class?

I know the syntax, rules applied to abstract class and I want know usage of an abstract class Abstract class can not be instantiated directly but can be extended by other class What is the ...