Why Java object class remains same after casting?

Question

I tried to upcast an objet. But at runtime object class is remained as a derived class.

Derived drv = new Derived();

Base base = (Base) drv;

System.out.print         


        

Answer 1

An upcast does not change the object's type. As a matter of fact, NOTHING changes a Java object's type.

That's the very core of OO programming: An object has a defined behavior that can't be influenced from the outside.