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Filter user keyboard input in JTextField (swing)

How can I limit keyboard input before it is entered in JTextField (swing)

I want to allow the user to enter only "+ -0123456789abcdef ,." characters and no more than 1 ,or .char

My JTextField is a single line input field.

thank!

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1 answer

You can achieve this DocumentFilter . This allows you to control text processing for any type of document. Or use JFormattedTextField

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Source: https://habr.com/ru/post/1785277/

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