public class Ball  extends Actor
{
    /**
     * Act - do whatever the Ball wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    private int speedY = -5;
    private int speedX = 5;

    public Ball(){

    }

    public void act()
    {
        move();
        atWorldEdge();
        bounce();
    }

  public boolean canSee(Class bounce)
        {
            Actor actor = getOneObjectAtOffset(0, 0, bounce);
            return actor != null;

        }

    private void move(){
         int y = getY()+speedY;
         setLocation(getX(),y);

         int x = getX()+speedX;
         setLocation(getY(),x);

    }

   private void atWorldEdge()
    {
        if(getX() == 0 || getX() == 599)
        {
            speedX = -speedX;
        }
        if(getY() == 0 || getY() ==799)
        {
            speedY = -speedY;
        }
    }



    private void bounce()
    {
        if (canSee(Paddle.class))
        {
            speedY = -speedY;
        }
    }
}