How to find out if a thread has finished execution?

Hi, Am new to multi-threaded programming. I have a question: I start a new thread from the main thread. This new thread has to update a swing component & thats it. How do I know when the new thread has finished its execution? Also, I need to kill the thread once it finishes its execution?..or will Java's GC take care of it? If I need to kill it from the code, how do I do it? I see that the destry() method of Thread class is deprecated.
Thanks.

boolean isAlive()
Also, I need to kill the thread once it finishes its execution?..No
or will Java's GC take care of it? Yes
You can do Thread.join.
See the API docs and/or a threads primer.

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