Need help with JAVA and Listeners

Thanks to all the people who have been helping me so far. I really appreciate it. I have another question.
I am bulding a GUI where it will consist of buttons and textfields. I want the textfields to display data but also permit the user to interact, i.e. enter data into the textfield and then when the enter key is depressed my program will evaluate the data and determine to use it or throw a pop up error window. If the data is acceptable than that textfield will change accordingly and depending on the data might possibly update the two other textfields.
I know there is an ActionListener for JButtons and a MouseListener. Is there a Listener for the enter key? What would be a simple method to implement my logic? Thanks again! I really appreciate, hopefully I can become more fluent in JAVA!

Swing related questions should be posted in the Swing forum.
enter data into the textfield and then when the enter key is depressed my program will evaluate the data and determine to use it Well, JTextField supports an ActionListener, which means an ActionEvent is fired when focus is on the text and and the Enter key is used.
However, what happens if the user uses the Tab key to move from field to field, then no event is fired and the Action Event is not generated. Maybe you can use an InputVerifier which will cause the text field to be validated when the text field loses focus.
Or, maybe you are talking about activating the "Enter" button when the enter key is pressed no matter what component has focus. In this case you should be using getRootPane().setDefaultButton(...);
Your need to clarify your requirement.

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