Ball.java
Color c; int x, y, dx, dy;
x = (int)(Math.random()*200);
y = (int)(Math.random()*200);
dx = (int)(Math.random()*3)+1;
dy = (int)(Math.random()*4)+1;
c = new Color ((int)(Math.random()*255),
(int) (Math.random()*255),
(int)(Math.random()*255));