Having problems with JPassword fields combined with terminalIO

Question

i copy pasted the code from the java tutorials of the JPasswordField program PasswordDemo. the code is found here... http://java.sun.com/docs/books/tutorial/uiswing/components/examples/PasswordDemo.java
then i went to the part that defines what the program does if the password is correct and copy pasted one of my programs in. i did this twice. one with a terminalIO program and one with a JOptionPane program. for some reason the JOptionPane works but the TerminalIO freezes the program and does not allow me to type anything into it. Does anybody have any sugestions on how to fix this other than translating the code to a JOptionPane program?
any help is greatly appreciated.

Answer 1

and this is the whole program so that you can put it into an editor:
import TerminalIO.KeyboardReader;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/* PasswordDemo.java requires no other files. */
public class PasswordDemo extends JPanel
implements ActionListener {
private static String OK = "ok";
private static String HELP = "help";
private JFrame controllingFrame; //needed for dialogs
private JPasswordField passwordField;
public PasswordDemo(JFrame f) {
//Use the default FlowLayout.
controllingFrame = f;
//Create everything.
passwordField = new JPasswordField(10);
passwordField.setActionCommand(OK);
passwordField.addActionListener(this);
JLabel label = new JLabel("Enter the password: ");
label.setLabelFor(passwordField);
JComponent buttonPane = createButtonPanel();
//Lay out everything.
JPanel textPane = new JPanel(new FlowLayout(FlowLayout.TRAILING));
textPane.add(label);
textPane.add(passwordField);
add(textPane);
add(buttonPane);
protected JComponent createButtonPanel() {
JPanel p = new JPanel(new GridLayout(0,1));
JButton okButton = new JButton("OK");
JButton helpButton = new JButton("Help");
okButton.setActionCommand(OK);
helpButton.setActionCommand(HELP);
okButton.addActionListener(this);
helpButton.addActionListener(this);
p.add(okButton);
p.add(helpButton);
return p;
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if (OK.equals(cmd)) { //Process the password.
char[] input = passwordField.getPassword();
if (isPasswordCorrect(input))
KeyboardReader reader = new KeyboardReader();
System.out.println("Enter a number: ");
int theInteger = reader.readInt();
System.out.println(theInteger);
else {
JOptionPane.showMessageDialog(controllingFrame,
"Invalid password. Try again.",
"Error Message",
JOptionPane.ERROR_MESSAGE);
//Zero out the possible password, for security.
for (int i = 0; i < input.length; i++) {
input[i] = 0;
passwordField.selectAll();
resetFocus();
} else { //The user has asked for help.
JOptionPane.showMessageDialog(controllingFrame,
"You can get the password by searching this example's\n"
+ "source code for the string \"correctPassword\".\n"
+ "Or look at the section How to Use Password Fields in\n"
+ "the components section of The Java Tutorial.");
* Checks the passed-in array against the correct password.
* After this method returns, you should invoke eraseArray
* on the passed-in array.
private static boolean isPasswordCorrect(char[] input) {
boolean isCorrect = true;
char[] correctPassword = { 'b', 'u', 'g', 'a', 'b', 'o', 'o' };
if (input.length != correctPassword.length) {
isCorrect = false;
} else {
for (int i = 0; i < input.length; i++) {
if (input[i] != correctPassword) {
isCorrect = false;
//Zero out the password.
for (int i = 0; i < correctPassword.length; i++) {
correctPassword[i] = 0;
return isCorrect;
//Must be called from the event-dispatching thread.
protected void resetFocus() {
passwordField.requestFocusInWindow();
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("PasswordDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
final PasswordDemo newContentPane = new PasswordDemo(frame);
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Make sure the focus goes to the right component
//whenever the frame is initially given the focus.
frame.addWindowListener(new WindowAdapter() {
public void windowActivated(WindowEvent e) {
newContentPane.resetFocus();
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();