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cau give clear explanation

 
Greenhorn
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1)is overloading is related to one class only or it can be extended in the derived class,also
2) why we need the hash code where we use it in realtime
 
Ranch Hand
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1. Both. One class may have two or more methods with the same name but different signatures. When this happens it is said to be overloaded. Likewise a class may have a method with the same name and a different signature than one inherited from another class, this is still overloading.

2. See HashMap for one example.
 
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