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Stop the beep on JFormattedTextField

When the user inputs an invalid value into JFormattedTextField, the default behavior is to emit a beep. To avoid this annoying beep, simply overload the invalidEdit() method. 
class MyJFormattedTextField extends JFormattedTextField {
...
protected void invalidEdit() {}
...
}
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Written and compiled by Réal Gagnon ©1998-2005
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