Works like a miracle, thank you.

I wish my teacher had any knowledge about programing when he introduced GF to us... It looks like you know what you are doing and hopefully your students can follow your thoughts. Usually you will get an answer like "Greenfoot is not thread-safe" from the GF team. Since I am not really into this, I can't tell you what you can do against this... GF is for beginners and that's why it gives you an environment without the need of using complicated java things. When I tried porting GF scenarios to android using Droidfoot, I had to use eclipse and I didn't have a clue about anything. I probably wou

Thanks for the help danpost. It works and feels much better now :D.

There are actually a lot of methods which do that already. And I think they added it with the new API (even though I am not sure). For example the getObjects method in World. It returns a List of the type you pass. So this one works without casting: <Code Omitted> However, it only works for methods which return a List, not for those which return one single object. So this line does not need a cast: <Code Omitted>but this one does:

Ah ok. thank you for my help. here is the finished code for those wondering.

The source was not uploaded. And it seems to be running an infinite loop on World construction.

So if that's what you want to do then do it. danpost's code should be in the World that you want to host these arrows.

When does it become gray? * when you compile (are the execution buttons grayed also)? * when you try to jump? * some other time? Be specific. However, it may be related to some code in your World subclass (which you have yet to post).

I dont know..

\n "This is\na test" = "This is a test"

Oh okay thank you

Maybe you could get some pointers from my Space Invaders Movement Demo scenario.

'int' and 'String' are called 'type's. They signify what a variable is to hold. 'int' is a primitive type (see here) and 'String' is an Object reference type (see here).