A small problem with swing

Question

if the user type no in this code the compiler response an exception error
see the code
import java.io.PrintWriter;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import javax.swing.*;
import java.util.Scanner;
public class AirlineSystem{
     public static void main(String [] args){
          Scanner in = new Scanner (System.in);
          String name  = "";
          String password ="" ;
          String rePassword ="";
          String cheek ;
          char choiseLetter ;
          char cheekLetter ;
          int type = 0;
          int count = 0 ;
          Scanner inputStream = null ;
          PrintWriter outputStream = null ;
          Security [] passenger = new Security [15000];
          cheek = JOptionPane.showInputDialog ("Are you a new user  ?") ;
          cheek = cheek.trim();
          cheekLetter = cheek.charAt(0) ;
          if (cheekLetter == 'y' || cheekLetter == 'Y'){..}
          for (int i = 0 ; i < passenger.length ; i++){
                    try{
                         inputStream = new Scanner(new FileInputStream("passenger.txt")) ;
                              catch(IOException e){
                                        JOptionPane.showMessageDialog(null,"an Error happened to the  file: passenger.txt" + e);
                                        System.exit(0) ;
                              if (inputStream.hasNextLine()){
                                        passenger[ i ].setUserName(inputStream.nextLine()) ;
                                        passenger[ i ].setPassword(inputStream.nextLine()) ;
                                        passenger[ i ].setType( Integer.parseInt(inputStream.nextLine())) ;
                              else {
                                        passenger [ i ] = null ;
                                        inputStream.close();
                                        break ;
                         name = JOptionPane.showInputDialog ("Please Enter Your name ");
                         for (int i = 0 ; i < passenger.length && passenger [ i ] != null ; i++){
                              if (passenger [ i ].getUserName() != name ) continue ;
                              else {
                                   name = passenger [ i ].getUserName() ;
                                   password = passenger [ i ].getPassword() ;
                                   type = passenger [ i ].getType() ;
                                   count ++ ;
                                   break ;
                              if (count != 0){
                                        for ( int i = 0 ; i < 3 ; i++){
                                                  rePassword = JOptionPane.showInputDialog("please entre your password") ;
                                                  if (password.equals(rePassword) && type == 8600000){
                                                  else if (password.equals(rePassword) && type != 8600000){
                                                  else continue ;
                              else {
                                             JOptionPane.showMessageDialog(null,"there is no user called : " + name) ;
                                             System.exit(0) ;
                                        }Regards

Answer 1

i faced this" NullPointerException "
here
if (passenger [ i ].getUserName() != name ) continue ;
                              else {
                              /*from here */      name = passenger [ i ].getUserName() ;
                                   password = passenger [ i ].getPassword() ;
                                   type = passenger [ i ].getType() ;
                                   count ++ ;
                                   break ;
                              }Edited by: java.student on Jan 12, 2008 9:06 AM