  public void resetBall(double newRadius) {
  // Sets (alters) the radius of an existing
  // ball to newRadius.
    setRadius(newRadius);
  }  // end resetBall

  public void resetBall(String newName) {
  // Sets (alters) the name of an existing
  // ball to newName.
    setName(newName);
  }  // end resetBall