symbol : class JPasswordID
location: class Passwordentering
private JPasswordID passwordID;
and
symbol : class JPasswordID
location: class Passwordentering
passwordID = new JPasswordID(10);
Line 12 and 19 on "passwordID" is unexpect not to work. Thanks to anyone that reply for hints and tips.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Passwordentering extends JPanel
implements ActionListener {
private static String OK = "ok";
private static String HELP = "help";
private JFrame controllingFrame; //needed for dialogs
private JPasswordField passwordField;
private JPasswordID passwordID;
public Passwordentering(JFrame f) {
//Use the default FlowLayout.
controllingFrame = f;
//Create everything.
passwordID = new JPasswordID(10);
passwordID.setActionCommand(OK);
passwordID.addActionListener(this);
passwordField = new JPasswordField(10);
passwordField.setActionCommand(OK);
passwordField.addActionListener(this);
JLabel label = new JLabel("Enter your id: ");
label.setLabelFor(passwordID);
JLabel label1 = 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(passwordID);
textPane.add(label1);
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 = passwordID.getPassword() && passwordField.getPassword();
if (isPasswordCorrect(input)) {
JOptionPane.showMessageDialog(controllingFrame,
"Success! You typed the right ID and password.");
} else {
JOptionPane.showMessageDialog(controllingFrame,
"Invalid password or ID. 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;
}
passwordID.selectAll();
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[] correctID = {'j','a','m','e','s' };
char[] correctPassword = { 'j','a','m','e','s' };
if (input.length != correctPassword.length) {
isCorrect = false;
} else {
for (int i = 0; i < input.length; i++) {
if (input[i] != correctPassword[i]) {
isCorrect = false;
}
}
}
//Zero out the password.
for (int i = 0; i < correctPassword.length; i++) {
correctID[i] = 0;
correctPassword[i] = 0;
}
return isCorrect;
}
//Must be called from the event-dispatching thread.
protected void resetFocus() {
passwordID.requestFocusInWindow();
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("Entering Java Programming");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
final Passwordentering newContentPane = new Passwordentering(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();
}
});
}
}

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