Hello and welcome.
Feel free to post as much as you want here. People here are a little grumpy, but they're nice (deep deeeeep inside). I guess if you've been following the forum you're already familiar with the
Lebgeeks Forum Etiquette. I strongly suggest you abide by it or else the big bad moderator (oh yeah, that's me!) will come and haunt your nightmares. And then you'll be scared.
A great way of introducing yourself is through your code. I reckon we do not have a lot of Java exercises, although a good part of them are not tied to a single language. Feel free to post your solution to any of the exercises. You can also comment on the numerous bits of code you'll find lying around the forum.
One more time, welcome and ... have fun!