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Only when using threads OTHER than the event dispatch thread. Its a long and somewhat complicated explanation that Sun microsystems can probably explain better than I can (see the link above), but...

ahh I see.
Breakpoints have to do with debugging. Although they won't solve all bugs, they allow you to stop at certain points and step through/into/and over methods and code during the execution...

Thats a lot of code, and I commend you on posting well commented code that is self contained and compileable. If you have access to a debugger, set breakpoints in the shapeProperties function and...