How can I be java proffecional, i want to know almost everything in java . Anyone can suggest me a reference?

Question

java ,proffecional

Answer 1

As a fun and worthwhile reading from beginner to intermediate level check the following book reviews out on Amazon:

Head First Java 2nd edition by Kathy Sierra & Bert Bates
https://www.amazon.com/Head-First-Java-Kathy-Sierra/dp/0596009208

Answer 2

http://docs.oracle.com/en/