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This code sample shows how to create a text field that only accepts digits as input. The idea comes from the API documentation of class JavaDoc:java.lang.JTextField, but this is a more complete example.

Note that the input is matched against a regular expression. If you need a text field for something different than numbers, you can easily change the regular expression to match the input that you want from the user.

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Don't get me started about those stupid light bulbs.
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