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JPasswordField jPasswordField = new JPasswordField();
Object[] message = {"Kennwort:\n", jPasswordField};
 
int a = JOptionPane.showConfirmDialog(null, message, 
       "Kennwort eingeben", JOptionPane.OK_CANCEL_OPTION, 
       JOptionPane.QUESTION_MESSAGE);
 
if(a == JOptionPane.OK_OPTION) {
   String pwd = new String(jPasswordField.getPassword());
   System.out.println("Kennwort: " + pwd);
}

JPasswordField jPasswordField = new JPasswordField(); Object[] message = {"Kennwort:\n", jPasswordField}; int a = JOptionPane.showConfirmDialog(null, message, "Kennwort eingeben", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE); if(a == JOptionPane.OK_OPTION) { String pwd = new String(jPasswordField.getPassword()); System.out.println("Kennwort: " + pwd); }