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what is the use, benefits and difference.

 
Greenhorn
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Given a sample program kindly have a look



Result of this program when compiled and run is " B B "

Now my question is what the use of writing in the code : A y = new B(); rather than B b = new B(); also tell benefits and difference.

Thanks in advance
 
Ranch Hand
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MyEclipse IDE Python Java
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in parent reference you can put any child class object... example of polymorphism........
 
Marshal
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Please read this.
 
Consider Paul's rocket mass heater.
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