If I have three classes
class A
class B extends A
class C extends A
Would using abstract classes or interfaces give me any type of errors or affect the way I implement the program?
views:
84answers:
3
+1
A:
You should generally prefer interfaces whenever you can. Java's lack of multiple inheritance quickly becomes a limiting factor if you use classes for that.
Tronic
2010-02-28 18:32:34
Java allows multiple inheritance for interfaces and if you use AspectJ you can add implementations of methods directly to interfaces. Put both together and you get: Multiple implementation inheritance.
Willi
2010-02-28 23:37:00
+1
A:
Yes. Abstract classes trade a shorter way of reusing implementation for the flexibility to provide multiple interfaces to the same object.
Unless you're playing code-golf, choosing the flexibility of interfaces is usually the better option.
Pete Kirkham
2010-02-28 18:34:00
+4
A:
Unless you need to share implementation, favor interfaces.
If you need to share implementation, think carefully if an abstract class is the right way to accomplish this.
Inheritance is a powerful tool, but can easily create an unmaintainable mess (I have been guilty here).
But to answer your question - no, there is nothing inherent in this setup that would cause an "error".
jayray
2010-02-28 18:39:58