Originally Posted by Ezzaral

Try adding the MaskFormatter like so

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try {
    MaskFormatter formatter = new MaskFormatter("?????");
    txtMask.setFormatterFactory(new DefaultFormatterFactory(formatter));
    txtMask.setFocusLostBehavior(JFormattedTextField.COMMIT);
} catch(ParseException ex) {
    ex.printStackTrace();
}

try { MaskFormatter formatter = new MaskFormatter("?????"); txtMask.setFormatterFactory(new DefaultFormatterFactory(formatter)); txtMask.setFocusLostBehavior(JFormattedTextField.COMMIT); } catch(ParseException ex) { ex.printStackTrace(); }

That mask only allows up to 5 letters, so you'll have to add the others up to 25.