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polymorphism

 
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what is polymorphism,why we need this concept,what is it's utility,how this can be achieved in java...
 
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Take your favorite search engine and you will find it explained numerously.
For example Wikipedia is one of the first hits, complete with a java example.
 
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In short, (runtime) polymorphism is a tool that allows us to write code that is better decoupled - the code that decides which method to call when can be different from the code that decides which implementation to use for that method call.
 
Don't get me started about those stupid light bulbs.
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