making a method add

public void act()
    {
        YouWin();
    }
    
    
    public void YouWin()
    {
        int numberOfApple = getObjects(Apple.class).size();
        int numberOfPizza = getObjects(Pizza.class).size();
        int numberOfFruit = numberOfApple() + numberOfPizza();
        if (numberOfFruit == 0)
        {
            addObject(new YouWin(), getWidth()/2, getHeight()/2);
            Greenfoot.stop();
        }
    }