Several JDK Samples are NetBeans Projects
By Geertjan-Oracle on Jan 25, 2008
Here's the evidence. Below, everything with an orange icon is a NetBeans project. So, you can open the entire directory of demos and the entire directory of samples in NetBeans IDE. Plus, you can open some of the samples themselves, which you can then run right away from the IDE.
Pretty cool, I reckon.