/**

*

*

*

*

* */

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.BorderLayout;

import java.awt.Dimension;

import javax.swing.border.*;

import javax.swing.JOptionPane;

import javax.swing.JTextField;

import javax.swing.JButton;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JFrame;

import javax.swing.Timer;

import java.util.ArrayList;

import java.util.*;

import java.io.*;

public class LoginGUI extends JFrame

{

private JTextField txtUser;

private JTextField txtPass;

private JTextField txtID;

private JLabel lblUser;

private JLabel lblPass;

private JLabel lblID;

private JButton btnLogin;

private JButton btnExit;

private JPanel panel1;

public Timer T;

private String passwordSaver="";

private ArrayList Users = new ArrayList();

public LoginGUI()

{

T = new Timer(1, null);

//T.start();

setLayout(new BorderLayout(10,10));

panel1 = new JPanel();

panel1.setPreferredSize(new Dimension(250, 250));

txtUser = new JTextField();

txtUser.setPreferredSize(new Dimension(150,20));

txtPass = new JTextField();

txtPass.setPreferredSize(new Dimension(150,20));

txtID = new JTextField();

txtID.setPreferredSize(new Dimension(150,20));

KeyListener PassListen = new PassWordListener();

txtPass.addKeyListener(PassListen);

lblUser = new JLabel("Username: ");

lblPass = new JLabel("Password: ");

lblID = new JLabel("StudentID: ");

btnLogin = new JButton("Login");

btnExit = new JButton("Exit");

panel1.add(lblUser);

panel1.add(txtUser);

panel1.add(lblPass);

panel1.add(txtPass);

panel1.add(lblID);

panel1.add(txtID);

panel1.add(btnLogin);

panel1.add(btnExit);

ActionListener LoginAction = new LoginListener();

btnLogin.addActionListener(LoginAction);

ActionListener ExitAction = new ExitListener();

btnExit.addActionListener(ExitAction);

add(panel1, BorderLayout.CENTER);

LoadUsers();

}

private void LoadUsers()

{

try

{

Scanner FileScan = new Scanner(new File("USERDATA.txt"));

String S="";

while (FileScan.hasNextLine())

{

S=FileScan.nextLine();

String[] Sa= S.split(",");

Users.add(new Person(Sa[0],Sa[1],Long.parseLong(Sa[2])));

}

FileScan.close();

}

catch(IOException e)

{

JOptionPane.showMessageDialog(null, e.getMessage());

}

}

class ExitListener implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

System.exit(0);

}

}

class LoginListener implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

Person P = new Person(txtUser.getText(),

passwordSaver,

Long.parseLong(txtID.getText()));

boolean found=false;

int iCode=0;

for(Person U : Users)

{

iCode=U.compareTo(P);

if (iCode==0)

{

found=true;

break;

}

else

{

found=false;

}

}

if (found)

{

JOptionPane.showMessageDialog(null,

"Your user account has been validated!");

txtUser.setText("");

txtPass.setText("");

txtID.setText("");

}

else

{

switch(iCode)

{

case -9:

JOptionPane.showMessageDialog(null,

"Your Username is incorrect. Please try again");

break;

case -10:

JOptionPane.showMessageDialog(null,

"Your Password is incorrect. Please try again");

break;

case -11:

JOptionPane.showMessageDialog(null,

"Your StudentID is incorrect. Please try again");

break;

default:

JOptionPane.showMessageDialog(null,

"Your 'somthing' is incorrect. Please try again");

break;

}

}

}

}

public class PassWordListener implements KeyListener

{

public void keyTyped(KeyEvent k)

{

char ch = (char) k.getKeyCode();

switch(ch)

{

case KeyEvent.VK_SHIFT:

return;

//do nothing when shift key is pressed...

case KeyEvent.VK_SPACE:

JOptionPane.showMessageDialog(null, "No Spaces Are Allowed");

txtPass.setText("");

break;

case KeyEvent.VK_COMMA:

JOptionPane.showMessageDialog(null, "No Commas Are Allowed");

txtPass.setText("");

break;

default:

passwordSaver += k.getKeyChar();

if(txtPass.getText().length() == 0)

{

txtPass.setText("*");

}

else

{

txtPass.setText(txtPass.getText().substring(0,txtPass.getText().length()-1)+"*");

}

System.out.println(passwordSaver);

break;

}

}

public void keyPressed(KeyEvent k)

{

}

public void keyReleased(KeyEvent k)

{

txtPass.setText(txtPass.getText().substring(0,txtPass.getText().length()-1)+"*");

}

}

}

the use of a "counter" to allow the user 3 failed attempts. - If the user fails three times to input the correct information, then the system will lockout for 15 seconds. - You should show a countdown window by seconds only, not the entire system time.