Try this in Eclipse Ganymede (one of the variants that includes the Java development tools):
Copy this text:
Bring the Package Explorer into focus (make sure that none of the existing projects is highlighted) and select “Paste” from the context menu.
JDT will build the project, package, class, and main method for you. How cool is that?
There’s a lot more hidden in the new and noteworthy. I’m in love with the rich hovers.