/**
   Class ObjectRefTest. Demo of object variables (references)
   
   @author A. Ozgelen
 */
public class ObjectRefTest {
    public static void main(String[] args) {
	Coin x = new Coin(); 
	x.flip();
	System.out.println("x: " + x);

	Coin y; 
	y = x; 
	System.out.println("y: " + y);

	x.flip(); 
	System.out.println("x.getFace():" + x.getFace()); 
	System.out.println("y.getFace():" + y.getFace()); 

	Pocket p = new Pocket(3); 
	System.out.println(p);
	p.getFaceOfCoin(1); 

	Pocket p2 = new Pocket(); 
	
	// would have been a NullPointerException if the 
	// Pocket.getFaceOfCoin didn't properly handle its input
	int face1 = p2.getFaceOfCoin(0); 
	System.out.println("Face value of the first coin in my pocket: " + face1); 
	
	// ArrayIndexOutOfBoundsException
	int face2 = p2.getFaceOfCoin(11); 
    }
}