//Antwoord 
//gedrag aanpassen
    public void act()
    {  
        checkKeys(); //toevoegen in act
        //...
    }

    public void checkKeys()
    {
        if(Greenfoot.isKeyDown("left"))
        {
            setDirection(2);
        }
        if(Greenfoot.isKeyDown("right"))
        {
            setDirection(0);
        }
        if(Greenfoot.isKeyDown("up"))
        {
            setDirection(3);
        }
        if(Greenfoot.isKeyDown("down"))
        {
            setDirection(1);
        }
    }