A JTextField that only accepts alphabet characters?

Hi there,
I'm new to java and I'm looking for a way to create a JTextField that only accepts characters. If anyone can maybe show me some code to do this? I've googled and searched these forums for related posts and I found this post:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=762721
however I haven't the first idea of documents or maskformatters, and my program is meant to be pretty simple. Is there any short way to do this? Or a way of accepting anything, then filtering it and replacing the inputted text with the new text, non-alphabet characters taken out?
Thanks
-Stern

lots of help if you google; for instance adapting some of these ideas may help:
http://www.cs.ut.ee/facilities/docs/java/tutorial/uiswing/components/textfield.html#validation

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A JTextField that only accepts alphabet characters?

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