// Example: How to use the Ball class
Ball[] balls;
void setup() {
   size(800, 600);
   background(255);
 
   balls = new Ball[10];
      for (int i = 0; i < balls.length; i++) {
      balls[i] = new Ball(random(5, 15));
   }
   
} // setup()
void draw() {
   background(255);
   for (int i = 0; i < balls.length; i++) {
      balls[i].move();
      balls[i].display();
   }
} // draw()