What would be a good way for me to practice Java...?

I have all the basics down. I can make text games decently well. I made a Pong game, and I followed a "do it yourself" tutorial that explains what needs to be done, but has you do it.
What should I do to further my Java skills? I'm not sure where to go from here. Networking seems too advanced. I don't feel too great at graphics either.
Any suggestions and pointers?
Thanks for any help.

I was just wondering if it was too advanced for someone of my level.Might be. I don't know your level.
But I'll give it a shot.Great.
Do you know of any good articles or tutorials on
relational databases? I've found some on Google, but
I'm not too sure of their quality...If you don't know anything, what difference does it make? Try a few and see how they go.
A good place to start might be the Sun JDBC tutorial. It won't teach you much about databases, but it has the virtue of being simple. Google for it.
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