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Thanks you two above for reply. The problem is that I overrided addObject() and removeObject() method in my world, and it turns out that is the bug. Again, thanks very much for helping.

That might be hard to do because a lot of my classes do different things. i don't even know how to about combining all those classes. When I reaches the maximum number of classes allowed, I could just make a sequel....

Please show the class code for the actor in question that you have so far (with an attempt at having moving and jumping code implemented).

Of course it is. You just need a reference to the object of that class whose image you want to change. For example, if an ActorA object intersects an ActorB object and you want to change the image of the ActorB object from the ActorA class: <Code Omitted>

Switch lines 27 and 28. After calling the 'removeObject' method, calling 'getWorld' will return null.

I actually just figured out my problem. I changed the coding for several classes and I got it to work.

Well I'll be.. it worked! Thank you danpost. I'll see about making good use of this. Some other thoughts occured to me while waiting for a response, I may be able to work on this through another way. But now that this is working it will help me immensely. Sorry for all the confusion, I'm very new to this.

Edit on last post: had wrong scenario listed; it has been corrected. The scenario uses a slowdown rate of one (true slowdown value of 1/100) and an acceleration rate of twenty (true acceleration value of 20/100 ).

You are asking for everything. Have you even tried? Where is your code? What part are you stuck on?

Thanks both of you! Look forward to my work soon up; working hard.

I see what you mean, if the Asteroid is class is being removed it would make sense why I was getting a null pointer. Hopefully I'll get a chance to get it working tonight. Thanks.

thanks

Thx a lot it works with this!

I think you should read the tutorials, especially #6.

What part are you having trouble with?