Need some help

    public void act() 
    {
        time = time + 1;
        if (time <= 150 ){
            move(0);
        }
        else {

            setLocation (Greenfoot.getRandomNumber(),getY()+dy);
            if (getY() >= getWorld().getHeight() - 1){
                dy = -5 ;
                Greenfoot.playSound("button-14.wav");
            }    
            if (getX() >= getWorld().getWidth() - 1){
                Greenfoot.setWorld ( new space());
            }    
            if (getY() <= 20){
                dy = 5;
                Greenfoot.playSound("button-14.wav");
            }
            if (getX() <= 20){
                Greenfoot.setWorld ( new space());
            }
            if (isTouching(P1.class)){
                dx = -dx;
                dy = dy-1;
                Greenfoot.playSound("button-3.wav");
            }
            if (isTouching(P2.class)){
                dx = -dx;
                dy = dy-1;
                Greenfoot.playSound("button-9.wav");
            }
        }    
    }
}