What does a java developer needs to know?

I'm studying "thinking in java", and trying to learn how to make GUI's with swing.
i feel i'm progressing, specially because this is the first programming language i'm studying seriously. i want to work as a java programmer. i want to learn it very well. I got a class about UML, and we are learning the basics using the book of booch, rumbaugh and jacobson. but only the basics(for now). my question is this:
if i want to be a really good java programmer, what else do i have to study?do i have to know UML very well or not? i think it's not enough knowing the language to be able to work and understand it as a whole.i need your help because here in argentina i don't know many java programmers, and i know that there in the USA you got better(and moore) programmers than us(surely you are some of them).
if you know good books, i hear you suggestions too.
i apologize for my english.
Thank you

Just a couple of thoughts:
Firstly, although huge, Thinking in Java (IMHO) is not a good place to start for Swing - it is very light-weight in this area.
I recently started to teach myself Swing and I haven't yet seen a book that has tempted me to part with cash. I followed all the Swing related tutorials, dredged these forums every day, and did a couple of throwaway projects. I am no expert now, but this approach got me through. You can also search the forum for books that others may recommend.
As for other things you need to know - I would say that kind of depends on what you want to do. Do you want to build web-based apps, desktop apps, apps that run on your TV top or in your hand? Give some thought to that and it will help you narrow down the list of complimentary skills you need.
In ANY case, make sure you have a thorough understanding of OOP, go through the Sun tutorials, and get yourself as well-grounded in the basics as you possibly can. You can then move forward.
Good Luck,
Steve

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What does a java developer needs to know?

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