public void useColoredSphere() {
  ColoredSphere ball = 
        new ColoredSphere(java.awt.Color.white);
  ball.setRadius(5.0);
  System.out.println("The ball diameter is " +
                      ball.diameter());
  System.out.println("The ball color is " + 
                      ball.getColor());
  // other code here...
}  // end useColorSphere