My personal views:
Ruby is the one I like most, but its popularity appears to be fading somewhat. It's easily the most fun to write in - in my opinion - but a few years from now it might be a dead language.
Python is nice to work in as well, and *much* less verbose than Java. You'll get things done quite a bit faster, usually. And, unlike Ruby, its future looks fairly bright.
Java is a pain in the ass, awful, disgusting and horrible. Also, it's by far the most useful language for getting (corporate) work. And it's not going anywhere. Ever.
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