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The ability of the VM to run a program while simultaneously carrying on statement-by-statement graphic operations says a lot about the underlying platform's speed and the quality of the graphics engine it includes. The dynamic illustration of those performance characteristics, coupled with the coolness factor of the application, no doubt account for the fact that, during his keynote, James Gosling, vice president and fellow at Sun Microsystems, invited Hughes up on the stage to demo VisiVue.
Since a program typically includes hundreds, if not thousands, of data structures, VisiVue includes a filtering capability so you can choose the structures you want to see. All in all, at 79, it's a heck of a cool tool that lets you see what your program is actually doing, thereby allowing you to see if your program performs the way you expect it to. That kind of information can be invaluable.
GridBag customizer