Object-oriented programming in Java.
Polymorphism is considered as an objectís ability so that it could take on various forms. It is most commonly used in OOP where parent class reference usually refers the child class objects.
Any java object that can pass more than one IS-A test is considered to be polymorphic. In Java, all java objects are polymorphic since any object will pass the IS-A test for their own type and for the class Object.
It shall be known that objects are access by one single way and that is