Upcasting Polymorphism in java

as well , if you know polimorhisam, about

Let's first understand the upcasting before Runtime Polymorphism.

Upcasting

When reference variable of Parent class refers to the object of Child class, it is known as upcasting. For example:

Like,

class a{}

class b extends a{}

then,

a obj = new b();//upcasting.