New language

Alright so i'm not a professional coder but i tought i'd start learning Java.
So now my question to /prog/ is: does anybody know any good places i can start learning Java? Like good PDF's or sites?
And what is the best compiler according to you?

I know C/C++ are way better but still i wanted to give Java a go.
I did a little Java before and I used Netbeans, anybody know any better program?