I need help please.

Actually, this code is wrong. If you check the documentation for the "getObjects" method (in the World class) you will see that it returns a List. It can never return null, but it may return an empty list! The corrected version of the above code would be: See the documentation for the List interface.

Yeah I know that stopping it is easy. The hard part is getting the crabs to count the worms they eat properly. If there is more than one crab eating the worms, the game will only stop when you get a SINGLE crab to eat the specified amount. If you just put it in the crab class to add one every time, it will apply to the individual crabs not the whole class of crabs.

@Royalblue64 Ahh, I see what you meant now. @davmac (getObjects(Worm.class).isEmpty()) Thanks :D. Could come in useful in many cases.

I guess, I was hoping he would read through and try to interpret. That's generally how I read source code from other people, not just copying.