How to limit the number of digits in a JPasswordField in Java?

Question

I have my Java code working in Eclipse but I need to add a few functionnality.

First, how to limit the number of digits that can be entered by the user ? Actually I

Answer 1

JPasswordField limit characters to 4

private void edtPinCodeKeyReleased(java.awt.event.KeyEvent evt) {                                       
    if (String.valueOf(edtPinCode.getPassword()).trim().length() > 4) 
        edtPinCode.setText(String.valueOf(edtPinCode.getPassword()).trim().substring(0, 4));
}