A google for "SUN <anything> TUTORIAL" almost always hits gold. Try the Concurrency section and see if that helps. Java 5 added a nifty bunch of thread pooling and other thread utilities. Scroll up to the Threads forum if you come up with more questions.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi