Hm, maybe we're not looking at the same demo. The one I saw was called
MouseEventDemo.java and it used just one other class called
BlankArea.java. I didn't see any other classes such as "guiboot".
If you're talking about the methods createAndShowGUI() and such, then 1) yes you need to use something like this, and 2) if you don't understand it, then you're wading too deep into the Swing tutorial pool and should back up to one of the earlier Swing tutorials.