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I'm sorry, I just checked this comment and half the crap I wrote just is not there :S. So I'll re-write.
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If you already know python and C++ you are off on a good foot.

There are soo many book for learning Java that your best bet is to go onto Amazon or another site, and search for learning Java books, and see how people have reviewed those books.

on another note TheNewBoston has some quite decent tutorials on Java that you might be interested in.

Also, don't forget that Java is a well Documented Language and oracle have extensive API documentation / tutorials on their site.

http://docs.oracle.com/javase/tutorial/

Maybe try going through their trail tutorials and you will pick it up no problem

There are so many books on learning It's also quite easy to figure things out.

http://docs.oracle.com/javase/tutorial/

Hope this helps in some way.