Searching a vector

Question

Ok, second post. I gave up on the whole array idea and moved to vectors. I got it reading the text file and adding to the vector succesfully. Now I need to search that vector. The text file looks like this:
9876543 9876543 Y
0612207 0612207 N
0123456 0123456 N
1234567 1234567 Y
Here's my code so far:
import java.*;
import java.awt.*;
import java.io.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
public class EmailForms extends JFrame implements ActionListener {
     private JTextField jtfUserName;
     private JPasswordField jpfPassword;
     private JButton jbtLogin;
     private JButton jbtCancel;
     Vector LoginData = new Vector();
     public static void main (String[] args) {     
          EmailForms LoginFrame = new EmailForms();
          LoginFrame.setSize(200, 100);
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          int screenWidth = screenSize.width;
          int screenHeight = screenSize.height;
          Dimension frameSize = LoginFrame.getSize();
          int x = (screenWidth - frameSize.width)/2;
          int y = (screenHeight - frameSize.height)/2;
          LoginFrame.setLocation(x, y);
          LoginFrame.pack();
          LoginFrame.setVisible(true);     
     public EmailForms () {     
          try {     
               String UP1Line;
               FileInputStream fis = new FileInputStream("UP1.txt");
              BufferedReader br = new BufferedReader(new InputStreamReader(fis));
              while ((UP1Line = br.readLine()) != null) {
                    StringTokenizer st = new StringTokenizer(UP1Line, " ");
                    while (st.hasMoreTokens()) {
                      LoginData.addElement(st.nextToken());
                br.close();
                fis.close();
          catch (IOException ex){
               JOptionPane.showMessageDialog(this, "Fatal Systems Error", "Email Forms: File Error 1",
               JOptionPane.INFORMATION_MESSAGE);
               System.exit(0);     
          catch (NullPointerException ex){
               JOptionPane.showMessageDialog(this, "Fatal Systems Error", "Email Forms: File Error 2",
               JOptionPane.INFORMATION_MESSAGE);
               System.exit(0);     
          setTitle("E-Forms: Login");
          JPanel jpLoginLabels = new JPanel();
          jpLoginLabels.setLayout(new GridLayout(2, 1));
          jpLoginLabels.add(new JLabel("Username:"));
          jpLoginLabels.add(new JLabel("Password:"));
          JPanel jpLoginText = new JPanel();
          jpLoginText.setLayout(new GridLayout(2, 1));
          jpLoginText.add(jtfUserName = new JTextField(10));
          jpLoginText.add(jpfPassword = new JPasswordField(10));
          JPanel p1 = new JPanel();
          p1.setLayout(new BorderLayout());     
          p1.add(jpLoginLabels, BorderLayout.WEST);
          p1.add(jpLoginText, BorderLayout.CENTER);
          JPanel p2 = new JPanel();
          p2.setLayout(new FlowLayout(FlowLayout.CENTER));     
          p2.add(jbtLogin = new JButton("Login"));
          p2.add(jbtCancel = new JButton("Cancel"));     
          getContentPane().setLayout(new BorderLayout());
          getContentPane().add(p1, BorderLayout.CENTER);
          getContentPane().add(p2, BorderLayout.SOUTH);
          jbtLogin.addActionListener(this);
          jbtCancel.addActionListener(this);
     public void actionPerformed(ActionEvent e) {
          String arg = e.getActionCommand();
          int index = find(jtfUserName.getText().trim(), new String(jpfPassword.getPassword()));
          if (arg == "Cancel") {
               System.exit(0);
               arg = "";
          if (arg == "Login") {
               if (index == -1) {
                    JOptionPane.showMessageDialog(this, "Username/Password Not Found", "Email Forms: Login Error",
                    JOptionPane.INFORMATION_MESSAGE);
               else {
                    if (index == 1 ){
                         JOptionPane.showMessageDialog(this, "Username and Password Found: Admin", "Email Forms: Good",
                         JOptionPane.INFORMATION_MESSAGE);
                    else {
                         JOptionPane.showMessageDialog(this, "Username and Password Found: User", "Email Forms: Good",
                         JOptionPane.INFORMATION_MESSAGE);          
          arg = "";
     public int find(String UName, String PWord) {
          for (int i = 0; i < LoginData.size(); i++) {                                        
               // if ((first.element.of.first.line.UName  == LoginData.elementAt(i)) && (second.element.of.first.line.PWord == LoginData(i))) {
               //          if (third.element.of.first.line.yes or no admin == "Y") {
               //               goto adminside;
               //               return 1; }
               //          else {
               //               goto userside;
               //               return 2;
          return -1;
}Essentially this is a login method. The standard username and password. The kicker is the third entry in each line of the vector "Y" or "No". This entry denotes whether or not the user is an admin. If he/she is an admin, they go to an admin program else he/she is a regular user and goes to the user program. I've done some reading on searching vectors in this forum as well as others, but none have I have read have tackled this third entry. Can someone have a look and give me their opinion.
Thanks in advance,
Colin

Answer 1

Here you go:
1. Use a HashMap to look up credentials.
2. Use regular expressions to check for certain values
The code does what you need (just checked it), but you probably wouldn't save the credentials as a "String[]" array. So there's room for improvement ;)
import java.awt.*;
import java.io.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
public class EmailForms extends JFrame implements ActionListener {
     private static final long serialVersionUID = -6409081110711705001L;
     private JTextField jtfUserName;
     private JPasswordField jpfPassword;
     private JButton jbtLogin;
     private JButton jbtCancel;
     private HashMap<String, String[]> users;
     public static void main (String[] args) {     
          EmailForms LoginFrame = new EmailForms();
          LoginFrame.setSize(200, 100);
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          int screenWidth = screenSize.width;
          int screenHeight = screenSize.height;
          Dimension frameSize = LoginFrame.getSize();
          int x = (screenWidth - frameSize.width)/2;
          int y = (screenHeight - frameSize.height)/2;
          LoginFrame.setLocation(x, y);
          LoginFrame.pack();
          LoginFrame.setVisible(true);     
     public EmailForms () {     
          users = new HashMap<String, String[]>();
          try {     
               String UP1Line;
               FileInputStream fis = new FileInputStream("UP1.txt");
              BufferedReader br = new BufferedReader(new InputStreamReader(fis));
              while ((UP1Line = br.readLine()) != null) {
                   String [] items = UP1Line.split(" ", 4);     //max. 6 tokens, separated by semicolon
                   users.put(items[0], new String[] { items[1], items[2] });
                   if (items[2].matches("[Yy]"))
                        System.err.println("y");
                   else
                        System.err.println("n");
                br.close();
                fis.close();
          catch (IOException ex){
               JOptionPane.showMessageDialog(this, "Fatal Systems Error", "Email Forms: File Error 1",
               JOptionPane.INFORMATION_MESSAGE);
               System.exit(0);     
          catch (NullPointerException ex){
               JOptionPane.showMessageDialog(this, "Fatal Systems Error", "Email Forms: File Error 2",
               JOptionPane.INFORMATION_MESSAGE);
               System.exit(0);     
          setTitle("E-Forms: Login");
          JPanel jpLoginLabels = new JPanel();
          jpLoginLabels.setLayout(new GridLayout(2, 1));
          jpLoginLabels.add(new JLabel("Username:"));
          jpLoginLabels.add(new JLabel("Password:"));
          JPanel jpLoginText = new JPanel();
          jpLoginText.setLayout(new GridLayout(2, 1));
          jpLoginText.add(jtfUserName = new JTextField(10));
          jpLoginText.add(jpfPassword = new JPasswordField(10));
          JPanel p1 = new JPanel();
          p1.setLayout(new BorderLayout());     
          p1.add(jpLoginLabels, BorderLayout.WEST);
          p1.add(jpLoginText, BorderLayout.CENTER);
          JPanel p2 = new JPanel();
          p2.setLayout(new FlowLayout(FlowLayout.CENTER));     
          p2.add(jbtLogin = new JButton("Login"));
          p2.add(jbtCancel = new JButton("Cancel"));     
          getContentPane().setLayout(new BorderLayout());
          getContentPane().add(p1, BorderLayout.CENTER);
          getContentPane().add(p2, BorderLayout.SOUTH);
          jbtLogin.addActionListener(this);
          jbtCancel.addActionListener(this);
     public void actionPerformed(ActionEvent e) {
          String arg = e.getActionCommand();
          int index = find(jtfUserName.getText().trim(), new String(jpfPassword.getPassword()));
          if (arg == "Cancel") {
               System.exit(0);
               arg = "";
          if (arg == "Login") {
               if (index == -1) {
                    JOptionPane.showMessageDialog(this, "Username/Password Not Found", "Email Forms: Login Error",
                    JOptionPane.INFORMATION_MESSAGE);
               else {
                    if (index == 1 ){
                         JOptionPane.showMessageDialog(this, "Username and Password Found: Admin", "Email Forms: Good",
                         JOptionPane.INFORMATION_MESSAGE);
                    else {
                         JOptionPane.showMessageDialog(this, "Username and Password Found: User", "Email Forms: Good",
                         JOptionPane.INFORMATION_MESSAGE);          
          arg = "";
     public int find(String UName, String PWord) {
          String [] creds = users.get(UName);
          if (creds!=null && creds[0].matches(PWord)) {
               System.out.println("ok");
               if (creds[1].matches("[Yy]"))
                    return 1;
               else
                    return 0;
          System.err.println("not ok");
          return -1;
}