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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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*/
package javademo.swing.text.PasswordDemo;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Arrays;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
/* PasswordDemo.java requires no other files. */
public class PasswordDemo extends JPanel implements ActionListener
{
private static final long serialVersionUID = 1L;
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))
{
JOptionPane.showMessageDialog(controllingFrame, "Success! You typed the right password.");
}
else
{
JOptionPane.showMessageDialog(controllingFrame, "Invalid password. Try again.", "Error Message",
JOptionPane.ERROR_MESSAGE);
}
// Zero out the possible password, for security.
Arrays.fill(input, '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
{
isCorrect = Arrays.equals(input, correctPassword);
}
// Zero out the password.
Arrays.fill(correctPassword, '0');
return isCorrect;
}
// Must be called from the event dispatch thread.
protected void resetFocus()
{
passwordField.requestFocusInWindow();
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch 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 dispatch thread:
// creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
// Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
}