Using abstract classes and Interfaces

If I have three classes

class A

class B extends A

class C 开发者_开发问答extends A

Would using abstract classes or interfaces give me any type of errors or affect the way I implement the program?

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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".

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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.

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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.