//
//  Hint for Programming Project 3.17 (page 173).
//***********************************************

1) You may have among others the following constants 
   declared before paint method:

   private final int MIN_DIAMETER = 5;
   private final int MAX_DIAMETER = 30;
   private final int MAX_X = 370;
   private final int MAX_Y = 170;

1) To paint several circles of random color, diameter, 
   and location, use Math.random()

2) Have a for loop (to scan the number of circles to draw) 
   in the paint method

3) Declare the following integers:
      int x, y, diameter, red, green, blue;

4) et the background black:
      setBackground (Color.black);

5) Compute x and y to be used as cooedinates for the circles.
         x = (int) (Math.random() * MAX_X);
         y = (int) (Math.random() * MAX_Y);

6) Compute the RGB values as random bumbers between 0 and 255
 
         r = (int) (Math.random() * 256);
         g = (int) (Math.random() * 256);
         b = (int) (Math.random() * 256);

7) Use the RGB values as parameters in the setColor method:

         page.setColor (new Color(r, g, b));

8) Compute the diameter as follows: 
    diameter = (int) (Math.random() * MAX_DIAMETER) + MIN_DIAMETER;

9) Draw the circles using the x, y and diameter parameters by 
invoking drawOval method:
         page.drawOval (x, y, diameter, diameter);