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Class inside interface

 
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Hi,

I came to know that we can declare class inside an interface...

So i was wondering what is the use of declaring class inside an interface ???

Basically interface defines the contact between the class implementing the interface..

 
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The only difference between a top level class and a class defined in an interface is the different namespace. It's used very seldomly, but if it's used at all, then typically to communicate that the class is very tightly coupled to the interface.
 
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It's not supposed to be used. It's like appendix of human, I believe.

If I've time, I'll come up with more technical answer.
 
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