Listing 2
  public class XMaker 
                  extends ShapeMaker
  {
    public XMaker(int street,
                  int avenue,
                  Direction facing,
                  int beepers)
    {
      super(street, avenue,
            facing, beepers);
    }

    public void makeShape()
    {
      makeDiagonal();
      turnLeft();
      makeDiagonal();
      turnLeft();
      makeDiagonal();
      turnLeft();
      makeDiagonal();
      turnOff();
    }

    public void makeDiagonal()
    {
      diagonalRight();
      putBeeper();
      diagonalRight();
      putBeeper();
      diagonalRight();
      putBeeper();
      turnAround();
      diagonalRight();
      diagonalRight();
      diagonalRight();
    }
  }