Ebook: Java in a Nutshell: A Desktop Quick Reference (In a Nutshell (O'Reilly))

A long time fan of O'Reilly books, the CD bookshelves and this deluxe edition are one of the best ideas I've seen from a publisher. If you don't mind reading onscreen these will save you money. If you do pick this up in addition to the hardcopy simply for the search capabilities. A great reference tool from any serious programmer.