Newbie here. I've been learning processing since 1 month now, with Dan's amazing book. Processing in really awsome !!

I'm trying to write a sketch where several balls fall and bounce for an exercise. It worked, and then I decided to ad some randomness to the whole thing (speed, radius of balls, distance between balls). 

If I implement the balls proprieties randomness in the for loop, the parameters change with every frame as the loop is in the draw function. So I had to use OOP. No problems defining the object itself. But to call it, I had so mess with arrays (I got the idea in this thread:  http://processing.org/discourse/beta/num_1250442400.html. But the sketch doesn't work. I've been looking at it for 2 days, and still can't find the problem. Mind giving me a hand on this one ?

Heres my sketch. 

2. float gap=random(10, 30);
3. //calling the object
4. Ball[] myBalls = Ball[10];
5. void setup () {
6.   size(500, 500);
7.   smooth();
8.   //println(gap);
9. // Heres the tricky part.
10.   for (int i=0, j=0; i<width; i+=gap, j++){
11.     myBalls[j]  = new Ball(i, 20);
12.   }
13. }
14. 
    
15. void draw () {
16.   background (0);
17.   for (int i=0; i<myBalls.lenght; i++){
18.     myBall[i].drop();
19.     myBall[i].display();
20. }
21. 
    
22. //new tab
23. 
    
25. class Ball {
26.   
27.   float x;
28.   float y;
29.   float r;
30.   float v;
31.   float g;
32.   
33.   Ball(float tempx, float tempy) {
34.     x = tempx;
35.     y = tempy;
36.     g=.9;
37.     v=5 + random (-2, 2);
38.     r=random (15, 25);
39.   }
40.   void display(){
41.     ellipseMode(CENTER);
42.     fill(255);
43.     ellipse (x, y, r, r);
44.     println("speed : "+v);
45.     println("radius: "+r);
46.   }
47. //Heres the code of gravity
48.   void drop(){
49.     y=y+v;
50.     v=v+g;
51.     if (y>height) {
52.       v*=-0.9;
53.     }
54.   }
55. }

Thanks !!

Paul