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In which situation we can write interface or abstract class.

 
Greenhorn
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Hi

In what situation we can write interface?
In what situation we can write abstract class?as both can have abstract methods.As per my knowledge we can go for interface when we need multiple Inheritance.Is there any other(best)situation to write interfaces?
 
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https://coderanch.com/t/380102/java/java/Abstract-Class-Vs-Interface
 
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