I'm working on a program where I want to show a bunch of categories and sub-categories using one of those menu trees. I'm using NetBeans to do most of the GUI grunt ...

I’m a big fan of NetBeans’s hints supports as proven by my blog posts on Seven Indispensable NetBeans Java Hints, Seven NetBeans Hints for Modernizing Java Code, Creating a NetBeans 7.1 Custom Hint, ...