please help

In your touchingfuit method in the fly class, before returning, if actor is not null, then do getWorld().removeObject(touching) or if you want to make it move to a different location do touching.setLocation(Greenfoot.getRandomNumber(getWorld().getWidth()), Greenfoot.getRandomNumber(getWorld().getHeight())). to change its picture do: touching.setImage(new GreenfootImage("picture file")).

public boolean touchingfuit() { Actor touching = getOneObjectAtOffset ( 0, 0, fruit.class); if (touching != null) { getWorld().removeObject((fruit)touching); return true; } return false; }