What does mean by POLYMORPHISM in Java

Answer 1

Yes. Method overriding, annotation @Override.

Answer 2

Preet, you can overload methods without inheritance, see e.g.
https://code.sololearn.com/cJmmki0zu8Fv/?ref=app

Answer 3

being able to do more than one thing. multiple uses

Answer 4

Polymorphism it is of two type :-
(1) Method Overloading
(2) Method Overriding

=>METHOD OVERLOADING
Method that is inherited and is redefined in child class, with same name and same signature but with different parameters/arguments is called "Method Overloading".

=>METHOD OVERRIDING
Method that is inherited and is redefined in child class, with same name and same signature is called "Method Overriding".