How about SO?
Check the resources at this site, it has a very good collection of sample questions and answers: http://www.j2eebrain.com/j2ee-interview-questions-answers
check out - Real interview Java Questions
Check the book Java Puzzlers by Joshua Bloch. http://www.javapuzzlers.com/
Amazon Link
http://www.glassdoor.com/ has lot of good java questions and puzzles.
One more link to Java Interview questions
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