/** This class models a standard 6-sided die.
*/
public class Die {

    // fields
    protected int sideUp;
    
    /** Constructor
     */
    public Die() { 
        this.sideUp = 1;
    }
    
    /** roll the die
      */
    public void roll() {
        this.sideUp = (int) (Math.random() * 6) + 1;
    }
    
    /** return the side that is up
      * @reaturn the side that is up
      */
    public int getSideUp() {
        return this.sideUp;
    }
    
    @Override
    public String toString() {
        return Integer.toString( this.sideUp );
    }
    
    @Override
    public boolean equals(Object other) {
        if (other == null) {
            return false;
        }
        if (other.getClass() != this.getClass()) {
            return false;
        }
        //Die d = (Die) other; // Cast the Object into a Die.
        return ((Die) other).getSideUp() == this.sideUp;
        
    }
            
    /** main method
     */
    public static void main( String[] args ) {
        Die d1, d2;
        d1 = new Die();
        d2 = new Die();
        Integer i = new Integer(6);
        System.out.println( Boolean.toString(d1 == d2) + " " + Boolean.toString(d1.equals(d2)) );
        System.out.println( d1.equals(i) );
        
        Die[] dice; // declare an array of Dies
        dice = new Die[5]; // make space to hold 5 dice
        for (int h = 0; h < 5; h++) {
            dice[h] = new Die();
        }
    }
    
}