Ask a Meaningful Question and HowToAskQuestionsOnJavaRanch
Getting someone to think and try something out is much more useful than just telling them the answer.
SCJP, SCWCD, SCBCD, SCJD, BB Java2 and JSP1.1
SCJP, SCJD, now studying for SCWCD and working to be a better person
I just cant look, its killing me.
Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)