8.7 Polymorphism in Java

What is Polymorphism?

The ability of an object to take on many forms is known as polymorphism.
The word "poly" means many and "morphs" means behavior. So polymorphism means many behavior.
Types of polymorphism : compile time polymorphism and runtime polymorphism.

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[miguelunch]

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[anaskala]

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[dnyaneshwarkadam]

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[BeardAndBeans]

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[vladanulardzic]

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[nesaresar]

However, POLYMORPHISM in Java means that a superclass reference variable can reference objects of a subclass. Overriding in a "is - a" relationship (Inheritance) means that a method in the subclass overrides the method with the same signature in the superclass.
Consider the following example:
1. public class ClassA
2. public class ClassB extends ClassA

POLYMORPHISM means you can do the following code:

ClassA obj = new ClassB ();