java: hide password input from command line and GUI component

A. If you are running the java program from a command line

java.io.Console console = System.console();
if (console != null) {
      char[] passwordChars = console.readPassword("Password: ");
      String password = new String(passwordChars);
}


B. Use JPasswordField if you are not running the program from a command line

String password = "";
final JPasswordField jpf = new JPasswordField(); 

int opt = JOptionPane.showConfirmDialog(null, jpf, "Password",                                                     JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE); 
if (opt == JOptionPane.OK_OPTION) {
      password = new String( jpf.getPassword() );
}

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