This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Well, if it's anything like a JTextField, you use the addKeyListener method. You can add a KeyAdapter so that you only have to implement the method(s) you need or you can add a new KeyListener and implement all the methods.