Tagged Questions

6
votes
3answers
181 views

Which of these design patterns is superior?

I find I tend to design class structures where several subclasses have nearly identical functionality, but one piece of it is different. So I write nearly all the code in the abstract class, and then ...
8
votes
3answers
407 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
228 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
221 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, ...
2
votes
6answers
758 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 ...
12
votes
4answers
548 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
982 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
791 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 ...
6
votes
4answers
951 views

Can I consider interface methods as abstract methods?

I was thinking about that, and I had some doubts. When I declare an interface, for example: public interface MyInterface { public void method1(); public void method2(); } Could these ...
10
votes
8answers
4k 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 ...