PPT Slide

Casting:

used here to give an object of a superclass the form of the appropriate subclass, e.g.,

if (animalArray[iIndex] instanceof Dog)

{

animalArray[iIndex].bark();

}

would produce an error because objects of class Animal have no method called bark. So, we first cast what instanceof tells us is a Dog as a Dog.

if (animalArray[iIndex] instanceof Dog)

{

d = (Dog) animalArray[iIndex]

d.bark( );

}

Polymorphism