This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
you have to buy it , you can get the materials for free from their site also.
If you wanna do data structures specially in Java. I think It doesn't get better than this. Even I am studying it right now, M in 5 th chapter
This book might be a bit heavy for you. In that case just do a tutorial in Collections classes from the net. You will find plenty.
A TubeBulb May light slowely... But it lights the Brightest..