Hi i have this project were i have to do a quiz. i wrote the questions in a textfile and i called them through java. I have also made a menu to choose which type of quiz. But before accessing the quiz i made a password (that displays a dialogue box)
But since i'm very new to Java, the part where it outputs the password, i haven't written it. I found it in the Internet. My problem is how to call the PasswordDemo class from the Geography_menu class. Because in the output i have to display first the part of the login password, and then if the user types it correctly it would display the menu(i.e the geography menu class). Pls help me do that command part because i'm really stuck.

Thanks a lot for being helpful

This is the menu part:

import java.util.*;
import java.io.*;
import java.util.Scanner;

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

public class GeographyQuiz_Menu
{
public static void main (String args[])
{
String yourChoice;
char choice;
int i, choice1;


Scanner keyboard = new Scanner(System.in);
i = 0;
while (i<=6)
{
// Input Menu
System.out.println(" ");
System.out.println("Welcome!");
System.out.println("This is a Geography Quiz");
System.out.println("Choose from the following Menu:");
System.out.println("1. Plate Tectonics");
System.out.println("2. Rivers");
System.out.println("3. Rocks");
System.out.println("4. Quit");
System.out.print("Please enter your choice: ");

yourChoice = keyboard.next(); // Enter choice

System.out.println(" ");



// Validate Choice
choice1=Integer.parseInt(yourChoice); // Convert variable from string to integer
if(choice1<1 || choice1>4)
{
System.out.println("This is an invalid choice");
}
switch(choice1)
{
case 1: System.out.println("You are taking the Plate Tectonics Quiz");
Scanner s = null;
try {
s = new Scanner(new BufferedReader(new FileReader("plate_tectonics.txt")));

while (s.hasNext()) {
s.useDelimiter(",\\s*");
System.out.println(s.next());
}
} finally {
if (s != null)
s.close();

break;
}
case 2: System.out.println("You are taking the River Quiz");

Scanner b = null;
try {
b = new Scanner(new BufferedReader(new FileReader("rivers.txt")));

while (b.hasNext()) {
b.useDelimiter(",\\b*");
System.out.println(b.next());
}
} finally {
if (b != null) {
b.close();
}

break;
}


case 3: System.out.println("You are taking the Rocks Quiz");
Scanner c = null;
try {
c = new Scanner(new BufferedReader(new FileReader("rocks.txt")));

while (c.hasNext()) {
c.useDelimiter(",\\c*");
System.out.println(c.next());
}
} finally {
if (c != null) {
c.close();
}

break;
}


}
}
}
}

And this is the part where it does the login password.

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

/* 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)) {
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,
"Ask the teacher for the password");
}
}

/**
* 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 = { 'g', 'e', '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_CLOS E);

//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();
}
});
}
}

Thanks a lot.