Why is an interface or an abstract class useful? (or for what?)

Posted by Oden on Stack Overflow See other posts from Stack Overflow or by Oden
Published on 2010-05-16T21:40:19Z Indexed on 2010/05/16 21:50 UTC
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programming

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object-oriented-design

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interface

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abstract-class

So my question is, why to use interfaces or abstract classes? Why are they useful, and for what?

Where can i use them intelligently?

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