Checking if digit and if not removing from JTextField

I have an input box that is a JTextField and I only want the user to be able to insert numbers. If the user types a letter I don't want the letter to be added to the JTextField. Is there a built in java method in the keyListener that I can use to ignore and not add a letter to a JTextField. I've tried using e.consume but the letter still stays in the field. Thanks

Swing related questions should be posted in the Swing forum.
You can also use a JFormattedTextField. You can read the API for general information.
However, if you read the JTextField API you will find a link to the "How to Use Text Fields" tutorial, which has a section on how to use formatted text fields.

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