"Hello cube" project - drawing and rotating a 3D cube on scree

I am fresh out of a Java course and out of classes until next August. I did not get what I wanted out of the course.

I've been looking around for a challenging project that's attainable. I figure using existing libraries to get a 3 dimensional cube to display and rotate on the screen is an innocuous enough goal that should blow up enough to be challenging but not be esoteric enough to leave me out in the middle of nowhere.

I'd prefer coding this in Java because it's the language I have the most recent experience in but if switching to another language would provide me with a more easily monetized skill, I'm fine jumping languages. I've done C/C++ in the (distant) past and have friends who know C#.

I have no idea where to start and suspect I need my hand held from a blank source file to being able to instance an object in a 3-dimensional viewport before I'll start seriously figuring stuff out on my own. Where should I look?

Thanks!