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"Well, I used 'getWorld().getObjects()', because getIntersectingObjects() also iterates over all Objects in the World-class, checks whether they intersect and then returns the list. So there's no affect to the running-time" - this is not correct. The collision checking in Greenfoot is sophisticated and maintains a dynamic space partition tree to make intersection checks very fast.
davmac

2016/5/18

Your upload didn't work, because your "project.greenfoot" has been renamed at some point to "Project.greenfoot". If you re-name it back, and then upload again, it should be fine.