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I have solved the question but i got a new question how can i get a signal that if the import file by scanner does not exist or the content in the file is not in correct order/format. i do not mean the immediate window will give out warnings but i want a method that will return boolean when the above error occur or not.

Thanks davmac.

10 cells up from the actor you call it from

You made a void method, the fact that it is returning nothing is a good thing :D Did you mean to say perhaps that nothing is being printed out?

very true!! thanks so much

Well: - The interface isn't called Test, it's called PointingDevice - It doesn't have a getDuration() method - It doesn't have a check() method - It doesn't have a getScore() method ...I'm not sure there's a lot to go on to help you there!

Just posted a connect 4 in progress scenarios that uses buttons the way you want, i put the code up , the squares on the board are effectively buttons. The buttons light up when the mouse moves over a particular legal square and when you click on a particular square a coin is placed in the square.. Note also when you enter a coin the square above that coin becomes active.

Let me just say again, though: Please don't post full source code here for the Greeps competition. It's a competition that is run regularly in many places, and the whole point is that you do this yourself. If you post all your code here, you are making it too easy for others to just copy your code. So, it's okay to discuss ideas, strategies an options, and to get general help on solving your problems, but please no posts of full source code for this one. Thanks.

Well I was re-reading my origonal post and I guess I could be more clear. Basically, whenever you have a variable that refrences an object, like Actor NewActor; the compilor thinks that NewActor is an Actor Object, and will only allow you to call Actor methods on it. Now, if the method is overridden (like act() for example), the Java Virtual Machine will call the correct act method, (the one from the subclass), so you don't have to worry about the program calling the correct overridden method, but what you can't do is call any methods that Actor doesn't have with that NewActor in your code or

use 'if (getOneObjectAtOffset(0, 10, Wall.class) != null) { return true; } else { return false; }' or just 'return (getOneObjectAtOffset(0, 10, Wall.class) != null);' BTW, walls usually have an X offset, not a Y offset. But if your walls are below your Actor, the above code should work. If they are actually walls located to the right (or left) of the Actor, along the x-coordinate, just adjust the code above.

This simple scenario I knocked up a while back to demonstrate how to achieve smooth movement with obstacles may help - the source is available there of course. http://www.greenfoot.org/scenarios/524

It definitely is!

There's no error checking in the spec that I can see, so that rules that one out. At this stage unfortunately I'm really not sure, and we can't really fix the problem since we can't reproduce it. If you have any more information though feel free to pass it on.

Thanks! I know now！