When to use an abstract class? An interface? [duplicate]

This question already has answers here: Closed 11 years ago. 开发者_Go百科

Possible Duplicate:

Interface vs Abstract Class (general OO)

I am little bit familiar with the terms Abstract class and the interface. But i want to know in which situation i have to use the interface and in which condition the abstract class.

Thanks

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Interface vs Abstract Class should be a useful read.

In short, Abstract Classes are meant to be extended, as in you're giving someone a base to work off of. Interfaces ensure that things have a common way of interacting with one another without having to worry about the inside details.

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Simple answer: you can implements many interfaces, but can only inherit from one class, so if you want to inherit some logic, you should use Abstract Class, otherwise Interface is more extensible.