I haven't updated myself with the recent new developments on Java front post Java 1.4 edition. I would appreciate if anyone can suggest a book or a website which helps me bridge this gap which gives information on the new features being added post 1.4.
I am sure you can find more. Then, do the same to find the differences from 1.5 and 1.6 (although those differences are minimal, and for that you can check the FAQ in this site.)
All code in my posts, unless a source is explicitly mentioned, is my own.