What is the use of Java Interfaces? [closed]

Posted by RayAllen on Stack Overflow See other posts from Stack Overflow or by RayAllen
Published on 2010-05-01T15:37:52Z Indexed on 2010/05/01 15:57 UTC
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Possible Duplicate:
How will I know when to create an interface?

Why do we need interfaces in Java?

Instead of interface can't we write the methods directly in the class itself?

Why do we need a separate interface?

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