PPT Slide

class Driver2 {

public static void main(String[ ] argv) {

Animal[ ] = animalArray[3];

Dog d;

int iIndex;

animalArray[0] = new Bird( );

animalArray[1] = new Dog( );

animalArray[2] = new Fish( );

for (1=0; 1 < animalArray.length; iIndex++)

if (animalArray[iIndex] instanceof Dog)

{ d = (Dog) animalArray[iIndex];

d.bark( );

} // if

} // main

} // Driver2

Polymorphism

We cast before calling bark() because only dogs can bark. So some array members cannot execute the method