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

public class PasswordDemo extends JPanel implements ActionListener {
    private static String OK = "ok";
    private static String CANCEL = "cancel";

    private JFrame controllingFrame; //needed for dialogs
    private JPasswordField passwordField;
    private JTextField useridField;

    public PasswordDemo(JFrame f) {
        //Use the default FlowLayout.
        controllingFrame = f;
      
        useridField = new JTextField(10);
        passwordField = new JPasswordField(10);
        useridField.setActionCommand(OK);
        passwordField.setActionCommand(OK);
        passwordField.addActionListener(this);
        useridField.addActionListener(this);

        JLabel label2 = new JLabel("User id:  ");
        label2.setLabelFor(useridField);
        
        JLabel label = new JLabel("Password: ");
        label.setLabelFor(passwordField);
        

        JComponent buttonPane = createButtonPanel();

        //Lay out everything.
        JPanel textPane = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        textPane.add(label);
        textPane.add(label2);
        textPane.add(useridField);
        textPane.add(passwordField);
        

        add(textPane);
        add(buttonPane);
    }

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

        okButton.setActionCommand(OK);
        okButton.addActionListener(this);
        cancelButton.setActionCommand(CANCEL);
        cancelButton.addActionListener(this);

        p.add(okButton);
        p.add(cancelButton);

        return p;
    }

    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();

        if (OK.equals(cmd)) { //Process the password.
            char[] input = useridField.[color=#FFFF66]getUserid[/color]() && passwordField.getPassword();
            
            if (isUseridCorrect(input) && isPasswordCorrect(input)){
                JOptionPane.showMessageDialog(controllingFrame,
                    "Success! You've typed the right user id.Please proceed to enter your password");
            } else {
                JOptionPane.showMessageDialog(controllingFrame,
                    "Invalid user id. Try again.",
                    "Error Message",
                    JOptionPane.ERROR_MESSAGE);
            }

            Arrays.fill(input, '0');

            useridField.selectAll();
            passwordField.selectAll();
            resetFocus();
        } else {      
        JOptionPane.showMessageDialog(controllingFrame,
                "Thank you");
        }
    }

      
    private static boolean isPasswordCorrect(char[] input) {
        boolean isCorrect = true;
        char[] correctPassword = { 'a', 'm', 'y', '2', '0', '1', '2' };
        

        if (input.length != correctPassword.length) {
            isCorrect = false;
        } else {
            isCorrect = Arrays.equals (input, correctPassword);
        }

        //Zero out the password.
        Arrays.fill(correctPassword,'0');

        return isCorrect;
    }


    private static boolean isUseridCorrect(char[] input) {
        boolean isCorrect = true;
        char[] correctUserid = { 'm', 'i', 'n', 't'};
        

        if (input.length != correctUserid.length) {
            isCorrect = false;
        } else {
            isCorrect = Arrays.equals (input, correctUserid);
        }

        //Zero out the user id
        Arrays.fill(correctUserid,'0');

        return isCorrect;
    }
    
    
    
    //Must be called from the event dispatch thread.
    protected void resetFocus() {
        useridField.requestFocusInWindow();
    }

    private static void createAndShowGUI() {

        JFrame frame = new JFrame("Login");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      
        final PasswordDemo newContentPane = new PasswordDemo(frame);
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);

        frame.addWindowListener(new WindowAdapter() {
            public void windowActivated(WindowEvent e) {
                newContentPane.resetFocus();
            }
        });

        
        frame.pack();
        frame.setVisible(true);
    }

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

String getUsername() { //method to retrieve username
return useridField .getText();
}