how to make a polymorphism in java if its possible to do so?

Question

polymorphism

Answer 1

Polymorphism is just a concept. You cannot make it.
If you use method overloading and/or method overriding, That is a Good use of Polymorphism.

Answer 2

https://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html

Answer 3

as @Meharban Singh said polymorphism is just a concept
Go to Java course to learn about it https://www.sololearn.com/Course/Java/