There is a problem in my application......................

Question

The following code is a Login Class code that I mentioned Earlier thanks for guiding me through but the problem is this that the code wouldn't go on after the isUser() method in this code.
(Remember I use JBuilder 3.5 Professional for building Java Applications.)
Please Help me out with this application...
package dailyExpense;
import java.io.*;
import java.io.Serializable;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class LoginExpense extends JFrame {
  JLabel LoginLbl = new JLabel();
  //Panels
  JPanel contentPane = (JPanel)this.getContentPane();
  JPanel User = new JPanel();
  JPanel btnPane = new JPanel();
  //Other things
  JLabel usrNmeLbl = new JLabel();
  JTextField userName = new JTextField();
  JLabel pasLbl = new JLabel();
  TextField passWord = new TextField(18);
  UIManager.LookAndFeelInfo looks[];
  JButton newUsrbtn = new JButton();
  JButton lgnbtn = new JButton();
  //File
  RandomAccessFile out;
  File f = new File("C:/Program Files/Expense.usr");//File Name
   public LoginExpense() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    catch(Exception e) {
      e.printStackTrace();
  private void jbInit() throws Exception {
    looks = UIManager.getInstalledLookAndFeels();
    contentPane.setLayout(new BorderLayout());
    LoginLbl.setFont(new java.awt.Font("Serif", 1, 25));
    LoginLbl.setForeground(Color.red);
    LoginLbl.setHorizontalAlignment(SwingConstants.CENTER);
    LoginLbl.setHorizontalTextPosition(SwingConstants.CENTER);
    LoginLbl.setText("LOGIN");
    usrNmeLbl.setText("User Name: ");
    userName.setPreferredSize(new Dimension(150, 21));
    User.setPreferredSize(new Dimension(210, 31));
    pasLbl.setMaximumSize(new Dimension(80, 17));
    pasLbl.setPreferredSize(new Dimension(70, 17));
    pasLbl.setText("Password: ");
    passWord.setEchoChar('*');
    this.setDefaultCloseOperation(3);
    this.setResizable(false);
    this.setTitle("Daily Expenses [LOGIN]");
    newUsrbtn.setFont(new java.awt.Font("Dialog", 1, 15));
    newUsrbtn.setText("New User");
    newUsrbtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        newUser(e);
    //lgnbtn
    lgnbtn.setFont(new java.awt.Font("Dialog", 1, 15));
    lgnbtn.setPreferredSize(new Dimension(103, 31));
    lgnbtn.setText("LOGIN");
    lgnbtn.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        usrlgn(e);
    //Add all things on the Panel
    btnPane.setPreferredSize(new Dimension(207, 41));
    contentPane.add(LoginLbl, BorderLayout.NORTH);
    User.add(usrNmeLbl, null);
    User.add(userName, null);
    User.add(pasLbl, null);
    User.add(passWord, null);
    contentPane.add(User, BorderLayout.CENTER);
    btnPane.add(newUsrbtn, null);
    btnPane.add(lgnbtn, null);
    contentPane.add(btnPane, BorderLayout.SOUTH);
    UIManager.setLookAndFeel(looks[2].getClassName());
     SwingUtilities.updateComponentTreeUI(this);
//Open File
private void OpenFile(){
    try{
    out = new RandomAccessFile(f, "rw");//Open File in Read Write Mode
  catch(IOException e){e.printStackTrace();}
//Open File in ReadOnly
private void OpenReadOnly(){
    try{
    out = new RandomAccessFile(f, "r");//Open File in Read Mode
  catch(IOException e){e.printStackTrace();}
//Close File
public void CloseFile(){
  try{
    if (out != null)
      out.close();
  catch(IOException e){e.printStackTrace();}
public void addRecord(){
  if (!(userName.getText() == "")){
    UserRecord urec = new UserRecord(userName.getText(), passWord.getText());
   try{
      out.seek(f.length()+1);
      urec.write(out);
    catch(IOException e){e.printStackTrace();}
    finally{
      CloseFile();
  else
    JOptionPane.showMessageDialog(this,"Please enter User Name", "Incomplete",
    JOptionPane.ERROR_MESSAGE);
public boolean isUser(User us){
boolean flag = true;
UserRecord usr = new UserRecord("","");
UserRecord ck = new UserRecord(us.getUserName(), us.getPwd());
try{
  do{
    OpenReadOnly();
    usr.read(out);}
    while(usr.getUserName() == "");
    if (usr.getUserName() == ck.getUserName() &&
                usr.getPwd() == ck.getPwd())
          flag = true;
    else
          flag = false;
          CloseFile();
    catch(EOFException e){e.printStackTrace();
    CloseFile();
    catch(IOException e){e.printStackTrace();}
    return flag;
void newUser(ActionEvent e) {
  OpenFile();
  addRecord();
  CloseFile();
   void usrlgn(ActionEvent e) {
     Expense expense = new Expense();
   UserRecord u = new UserRecord (userName.getText(), passWord.getText());
   if(isUser(u)){
      expense.setVisible(true);
      this.setVisible(false);
public static void main(String[] args) {
    LoginExpense login = new LoginExpense();
    Expense expense = new Expense();
    login.setSize(new Dimension(250, 200));
    login.setVisible(true);
    expense.setSize(new Dimension(600, 250));
    expense.setVisible(false);
class User implements Serializable{
  private String UserName;
  private String Password;
public User(String usr, String pwd){
  UserName = usr;
  Password = pwd;
  public User(){
public User(User usr){
  this.UserName = usr.UserName;
  this.setPassWord(usr.Password);
  public void setUserName(String name){
    this.UserName = name;
  public String getUserName(){
    return UserName;
  public String getPwd(){
    return Password;
  public void setPassWord(String pwd){
    Password = pwd;
  public boolean equalto(User usr){
   if(this.UserName.equals(usr.UserName))
    return true;
    else return false;
class UserRecord extends User{
public UserRecord(String UserName, String Pwd){
   super(UserName, Pwd);
private String padName(RandomAccessFile file) throws IOException{
  char name[], temp;
  name = new char[15];
   for(int i=2; i<name.length; i++){
     temp=file.readChar();
     name[i] = temp;
return new String(name).replace('\0',' ');
private void writeString(RandomAccessFile file, String txt)
throws IOException{
StringBuffer buf = null;
if (txt!=null)
   buf = new StringBuffer(txt);
else
   buf = new StringBuffer(15);
  buf.setLength(15);
  file.writeChars(buf.toString());
public void read(RandomAccessFile file)throws IOException{
   setUserName(padName(file));
   setPassWord(padName(file));
public void write(RandomAccessFile file)throws IOException{
  writeString(file, getUserName());
  writeString(file, getPwd());
public static int size(){
   return 65;
}Help me out with this

Answer 1

Well Basically nothing happens.
The code just will not execute the following portion
public boolean isUser(User us){
boolean flag = true;
UserRecord usr = new UserRecord("","");
UserRecord ck = new UserRecord(us.getUserName(), us.getPwd());
try{
  do{
    OpenReadOnly();
    usr.read(out);}
    while(usr.getUserName() == "");
    if (usr.getUserName() == ck.getUserName() &&
                usr.getPwd() == ck.getPwd())
          flag = true;
    else
          flag = false;
          CloseFile();
    catch(EOFException e){e.printStackTrace();
    CloseFile();
    catch(IOException e){e.printStackTrace();}
    return flag;
  }I am calling it when the User presses the Login button as follows
void usrlgn(ActionEvent e) {
     Expense expense = new Expense();
   UserRecord u = new UserRecord (userName.getText(), passWord.getText());
   if(isUser(u)){
      expense.setVisible(true);
      this.setVisible(false);
  }Now is it easier............?????????????????????????????????