import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

public class EatenPlayers extends World
{
    /**
     * Constructor for objects of class EatenPlayers.
     * 
     */
    public EatenPlayers()
    {    
        super(600, 400, 1); 
    }
    public void act()
    {
        checkPlayers();
    }
    private void checkPlayers()
    {
        if (getObjects(Penguin.class).isEmpty())if(getObjects(Bee.class).isEmpty())
        {
            Greenfoot.stop();
        }
    }  
}

    public void lookForPlayers()
    {
        if (canSee(Penguin.class))if(canSee(Bee.class))

        {
            Greenfoot.stop();
        }
    }

if (getObjects(Penguin.class).isEmpty() && getObjects(Bee.class).isEmpty()) Greenfoot.stop();