public void boxBounce(int balls){
         Rectangle box=new Rectangle(100,100,200,200);
         myCanvas.draw(box);

        Random randomGen=new Random();
        ArrayList<BoxBall> listBalls=new ArrayList<BoxBall>();
        Color color;
        for(int i=0;i<balls;i++){
            int y=100+randomGen.nextInt(185);
            int x=100+randomGen.nextInt(185);
            int speed=1+randomGen.nextInt(6);
            if(speed<3){
                color=Color.black;
            }
            else if (speed<5){
                color=Color.red;
            }
            else{
                color=Color.blue;
            }
            BoxBall ball = new BoxBall(y,x,15,color,300,myCanvas,speed);
            listBalls.add(ball);
            ball.draw();
        }
        boolean finished = false;
        while(!finished){
            for(int i=0;i<listBalls.size();i++){
                listBalls.get(i).move();
            }
            myCanvas.wait(50);
        }
    }