Best book to study Java

I also recommend effective Java once you've read hfj

Effective Java (Bloch) gives the best practices.

I think you should read "Effective Java". Imho, It is one of the best books I have ever read.

The Head First Series is "Learn the Hard Way" backed by modern educational theory

I love the Head first series books.

Thinking in Java by Bruce Eckel is a great book

+1 for head first java

I can't recommend Head First Java enough

Head First Java explained things clearly and enjoyably!

Core Java (vol 1, 8th ed) gives you a pro-C++, no-nonsense comprehensive coverage.

the early editions of O'Reilly's "Java in a nutshell" (by David Flanagan) books

Java Precisely (Sestoft) gives you the crispiest syntax.