Test 3

public void endGame()
    {
        if (getOneIntersectingObject(Obstacle.class) != null)
        {
            World world = getWorld();
            Greenfoot.playSound("gameover.wav");
            getWorld().removeObject(this);  
            //gameOver();
            world.removeObjects(world.getObjects(null));
            world.setBackground("Gameover.png");  
            Greenfoot.stop(); 
        }
    }