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Thanks for all of the help danpost, I now understand it.

Where exactly do you get this error message?

Where is 'bri' defined (used on line 21)? What is the class of the object you are trying to add there?

The download page will give you (or lead you) to the answers you desire.

I have a class called Entity and a class World. The setWorld method in Entity should be only usable for the World. It's using it in it's methods addObject and removeObject.

Thanks :D

Everything works. Thank you!

@danpost I'm sorry to say it danpost, but that one is the most memory so far :(

And you can also update Tod's code further by merging all the mehods into one, like so:

It depends on what you mean by "work". It might appear to work most of the time, but then just once every so often it might not work. Or it might stop working when you update Java. Or, it might not work on someone else's computer. Or, it might seem to work but cause something else to fail unexpectedly later. That's the nature of thread-related issues.

me too

Thanks!