java book for c# developers?

hi, i'm already a c# programmer, and i heard that java is pretty similar to c# (actually c# is the one similar to java), so i thought i should check it out.
is there a book out there to teach java for the ppl who are already c# programmers, or programmers in general who are aware of general concepts like oop, classes, polymorphism and stuff?
a downloadable free book is preferred.. thanks

go to sun's free java tutorials...they assume that you have knowledge of basic programming concepts, and it seems Like You do, and is pretty succcint and easy to read and understand.

Ruby Programming Tutorial 2 - Object Orientation

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