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Interfaces

 
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what are the advantages of interface other than mutiple inheritance and Polymorphysm.
 
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You can use interfaces to influence package dependencies. Say I want to write a new Swing listener. I must implement an interface defined by Swing. So I depend on Swing, even though Swing is calling me. It would be very bad if Swing depended on me and had to release an update to Swing for every new listener I wrote!
The Dependency Inversion Principle of OO design is all about this. That link is to something I wrote, which in turn has a link to Rober Martin's golden font of wisdom.
 
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