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I am trying to automatically add a space between character groups in a TextTield.

When user enters 8 digits I want to insert a space between the first- and last four digits:

12345678 => 1234 5678

Captain Obvlious
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Midorima Shintarou
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1 Answers1

0

Try JFormattedTextField that allows you set an input mask. 

MaskFormatter mask = null;
try {
    mask = new MaskFormatter("#### ####");
    mask.setPlaceholderCharacter(' ');
} catch (ParseException e) {
    e.printStackTrace();
}       
JFormattedTextField textfield = new JFormattedTextField(mask);
ArcticLord
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  • Why the `try/catch` block if you don't handle the exception anyway? Can `JFormattedTextField` handle a `null` formatter? Does the code in that block even throw a `ParseException`? Why set a placeholder character when space is the default anyway? – Robert Dec 23 '15 at 14:32
  • `try/catch` block because MaskFormatter Constructor throws `ParseException` if syntax error in mask. And if it does and mask is `null` the resulting `JFormattedTextField` works and acts like normal `JTextField`. The placeholder is not necessary. I put it for demonstration. – ArcticLord Dec 23 '15 at 14:47