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why we use interface instead of abstract class

 
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HI,
Abstract class and interfaces both we have to declare methods. at what situation we can use abstract class and interfaces. both should have to use declared methods. but why mostof the time we prefer interfaces? why not abtstract class.

plz explain any body,
Sanju.
 
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You asked this question in at least one other forum. Kindly don't multi-post the same question in multiple places. This is really a beginner question.
 
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