Class Extension Java

Question

I have class A, and class B ( extends A ). I'm attempting to call out methods from class B, when B is cast as A. Is this possible?

Ex.

A myObject = new B();
myObject.myMethodFoundInB(param);

Answer 1

You can do it by casting back to B, ie:

A myObject = new B();
((B)myObject).myMethodFoundInB(param);

or, more safely:

A myObject = new B();
if (myObject instanceof B) {
    ((B)myObject).myMethodFoundInB(param);
}