Some best books on Java

Effective Java















Java in a Nutshell














Thinking in java

















Head First Java
















Java Puzzlers













Core Java - volume 1 and volume 2













However if you a java programmer, their are other parts in programming as well, like concurrency, design patterns and many more.  So there are books on that as well. You can read about these books over here.

If you some good book is not included here, please tell me that in comment. I will include that book. Thanks :)