// test program #2 
// SimpleClasses.txt - tests method calls and dispatch.

public class SimpleClasses {

  public SimpleClasses() {
    super();
  }

  public static void main()  {
    JFSystem sys;
    IceCream  i1;
    IceCream  i2;
    Sundae  s;

    // Create objects
    sys = new JFSystem();
    i1 = new IceCream(sys);
    i2 = new Sundae(sys);
    s  = new Sundae(sys);

    // Call the print methods
    i1.howManyCalories(500,400);    // Should print 100
    i2.howManyCalories(50,-2);      // Should print 156
    s.howManyCalories(6,11);        // Should print -15
  }	

}

public class IceCream {
  public JFSystem mySys;

  public IceCream(JFSystem sys) {
    super();
    mySys = sys;
  }

  public int foo(int a) {
    return a;
  }

  public void howManyCalories(int a, int b) {
    mySys.put(a-b);
  }

  public int hoo(int b) {
    return b;
  }

}

public class Sundae extends IceCream {

  public Sundae(JFSystem sys) {
    super(sys);
  }

  public void boo() {
    mySys.put(0);
    mySys.put(0);
    mySys.put(0);
  }

  public void howManyCalories(int a, int b) {
    mySys.put((a-b)*3);
  }

}