1. The Java Programming Language, Third Edition by Ken Arnold, James
Gosling, David Holmes. Addison-Wesley.
2. Effective Java by Joshua Bloch, Addison-Wesley.
3. Thinking in Java by Bruce Eckel. Prentice Hall - My personal favourite. Very
useful and simple book to understand Java programming. Free HTML version
available for download.
4. Bitter Java by Bruce Tate, Manning Publications.