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2 Answer(s)      8 years ago
Posted in : Java Beginners


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October 3, 2008 at 5:11 PM

Hi friend,

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;

public class JPasswordDemo extends JPanel implements ActionListener{
private String OK = "ok";
private String HELP = "help";
private JFrame frame;
private JPasswordField passwordField;

public JPasswordDemo(JFrame f) {
frame = f;
//Create everything.
passwordField = new JPasswordField(10);
JLabel label = new JLabel("Enter the password: ");
JComponent buttonPane = createButtonPanel();
//Lay out everything.
JPanel textPane = new JPanel(new FlowLayout(FlowLayout.TRAILING));


protected JComponent createButtonPanel() {
JPanel p = new JPanel(new GridLayout(0,1));
JButton okButton = new JButton("OK");
JButton helpButton = new JButton("Help");


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)) {
JOptionPane.showMessageDialog(frame, "Success! You typed the right password.");
else {
JOptionPane.showMessageDialog(frame, "Invalid password. Try again.", "Error Message",
//Zero out the possible password, for security.
Arrays.fill(input, '0');
} else { //The user has asked for help.
"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.");

October 3, 2008 at 5:13 PM

private boolean isPasswordCorrect(char[] input) {
boolean isCorrect = true;
char[] correctPassword = { 'b', 'u' };

if(input.length != correctPassword.length) {
isCorrect = false;
} else {
isCorrect = Arrays.equals (input, correctPassword);
//Zero out the password.

return isCorrect;

protected void resetFocus() {
private static void createAndShowGUI() {
JFrame frame = new JFrame("password filed example");
final JPasswordDemo newContentPane = new JPasswordDemo(frame);
newContentPane.setOpaque(true); //content panes must be opaque
frame.addWindowListener(new WindowAdapter() {
public void windowActivated(WindowEvent e) {

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
UIManager.put("swing.boldMetal", Boolean.FALSE);

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