Help on project...Urgent please!!!

Question

Below i have some source code about one part of an aircraft reservation system.
This class is the initialisation of the Aircraft file...this stores the information of a particular flight and the number of seats (first class, business class, and economy class).
I want it to store the data as a 2d array that stores both string and int...but then i couldnt find a way of implementing the code.
Could you all please help me in figuring this out...thanks a bunch...
import javax.swing.*;
import java.util.*;
import java.io.*;
public class SetupAircraft {
     static ArrayList aircraft;
     public static void init () {
          aircraft = new ArrayList(5);
          loadAircraft(aircraft);
     //opens up another sub group while the user
     //entered 1 as his/her option in the SetupSystem
     //menu
     public static void Setup () {
          //this will create a string that is going to be displayed
          //in the input dialog box
          String menu = " Please select an option: \n"
                         +"----------------------------\n"
                         +"1) Add New Aircraft\n"
                         +"2) Edit Existing Aircraft\n"
                         +"3) List Aircraft\n"
                         +"4) Delete Existing Aircraft\n"
                         +"5) Save\n"
                         +"6) Return to Main Menu\n\n"
                         +" Enter a number between 1-6\n";
          //declare a field named option for selection through menu
          int option = 0;
          //continue the loop until the user inputs the number 6
          do {
               //error handling for the input from the menu
               //if the input is not integer the error is caught and
               //reassigning option to be 0
               try {
                    option = Integer.parseInt(JOptionPane.showInputDialog(null, menu,
                              "Setup Aircraft", JOptionPane.QUESTION_MESSAGE));
               catch (NumberFormatException e) {
                    option = 0;
               //determine which option the user has chosen
               //and enters the respective section
               switch (option) {
                    case 1: add(aircraft);
                              break;
                    case 2: edit(aircraft);
                              break;
                    case 3: list(aircraft);
                              break;
                    case 4: //delete(aircraft);
                              break;
                    case 5: save(aircraft);
                              break;
                    case 6:     return;
                    default: JOptionPane.showMessageDialog(null, "Please enter a number between 1-6",
                              "Alert", JOptionPane.ERROR_MESSAGE);
                              option = 0;
          while (true);
     public static void add (ArrayList aircraft) {
          String type = "";
          int first = 0;
          int business = 0;
          int economy = 0;
          do {
               try {
                    type = JOptionPane.showInputDialog(null,"Enter Aircraft Type", "Prompt for Type",
                    JOptionPane.QUESTION_MESSAGE);
                    try {
                         if(aircraft.contains(type)) {
                              JOptionPane.showMessageDialog(null, type + " already exist!",
                              "Error", JOptionPane.ERROR_MESSAGE);
                              type = "-100";
                    catch (Exception e) {}
                    if (type=="-100");
                    else if (type.length()==0) {
                         JOptionPane.showMessageDialog(null, "Please enter an aircraft type",
                         "Error", JOptionPane.ERROR_MESSAGE);
                    else if (!(type.startsWith("-",3))) {
                         JOptionPane.showMessageDialog(null, "Please enter the aircraft type with XXX-XXX format where X is integer.",
                         "Error", JOptionPane.ERROR_MESSAGE);
                         type = "0";
               //catch the input error that the user has produces.
               catch (Exception e) {
                    return;
          while (!(type.startsWith("-",3)));
          //try to ask the user for the passenger's name and if the name field contains
          //no characters at all repeat the prompt for name field until the user presses
          //Cancel.
          try {
               first = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter First Class Capacity",
               "Prompt for Capacity", JOptionPane.QUESTION_MESSAGE));
          catch (Exception e) {
               String error = "For input string:";
               if (e.getMessage() == "null") {
                    return;
               else if (e.getMessage().startsWith(error)) {
                    JOptionPane.showMessageDialog(null, "Please enter only numbers",
                    "Error", JOptionPane.ERROR_MESSAGE);
          try {
               business = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter Business Class Capacity",
               "Prompt for Capacity", JOptionPane.QUESTION_MESSAGE));
          catch (Exception e) {
               String error = "For input string:";
               if (e.getMessage() == "null") {
                    return;
               else if (e.getMessage().startsWith(error)) {
                    JOptionPane.showMessageDialog(null, "Please enter only numbers",
                    "Error", JOptionPane.ERROR_MESSAGE);
          try {
               economy = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter Economy Class Capacity",
               "Prompt for Capacity", JOptionPane.QUESTION_MESSAGE));
          catch (Exception e) {
               String error = "For input string:";
               if (e.getMessage() == "null") {
                    return;
               else if (e.getMessage().startsWith(error)) {
                    JOptionPane.showMessageDialog(null, "Please enter only numbers",
                    "Error", JOptionPane.ERROR_MESSAGE);
          Aircraft newAircraft = new Aircraft (type, first, business, economy);
          aircraft.add(newAircraft);
          JOptionPane.showMessageDialog(null, "Aircraft Sucessfully Added",
          "Successful", JOptionPane.INFORMATION_MESSAGE);
     public static void edit (ArrayList aircraft) {
          String type = "";
          int first = 0;
          int business = 0;
          int economy = 0;
          do {
               try {
                    type = JOptionPane.showInputDialog(null, "Enter Aircraft Type to Edit",
                    "Prompt for Type", JOptionPane.QUESTION_MESSAGE);
                    if (type.length()==0) {
                         JOptionPane.showMessageDialog(null,"Please enter an aircraft type",
                         "Error",JOptionPane.ERROR_MESSAGE);
                    else if (!(type.startsWith("-",3))) {
                         JOptionPane.showMessageDialog(null, "Please enter the aircraft type with XXX-XXX format where X is integer.",
                         "Error", JOptionPane.ERROR_MESSAGE);
                         type = "0";
               catch (Exception e) {
                    return;
          while (!(type.startsWith("-",3)));
          try {
               int edited = aircraft.indexOf(new UniqueAircraft(type));
               Aircraft craft = (Aircraft)aircraft.get(edited);
               try {
                    first = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter First Class Capacity",
                    "Prompt for Capacity", JOptionPane.QUESTION_MESSAGE));
               catch (Exception e) {
                    String error = "For input string:";
                    if (e.getMessage() == "null") {
                         return;
                    else if (e.getMessage().startsWith(error)) {
                         JOptionPane.showMessageDialog(null, "Please enter only numbers",
                         "Error", JOptionPane.ERROR_MESSAGE);
               try {
                    business = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter Business Class Capacity",
                    "Prompt for Capacity", JOptionPane.QUESTION_MESSAGE));
               catch (Exception e) {
                    String error = "For input string:";
                    if (e.getMessage() == "null") {
                         return;
                    else if (e.getMessage().startsWith(error)) {
                         JOptionPane.showMessageDialog(null, "Please enter only numbers",
                         "Error", JOptionPane.ERROR_MESSAGE);
               try {
                    economy = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter Economy Class Capacity",
                    "Prompt for Capacity", JOptionPane.QUESTION_MESSAGE));
               catch (Exception e) {
                    String error = "For input string:";
                    if (e.getMessage() == "null") {
                         return;
                    else if (e.getMessage().startsWith(error)) {
                         JOptionPane.showMessageDialog(null, "Please enter only numbers",
                         "Error", JOptionPane.ERROR_MESSAGE);
               Aircraft newAircraft = new Aircraft (type, first, business, economy);
               aircraft.add(newAircraft);
               aircraft.add(newAircraft);
               JOptionPane.showMessageDialog(null, "Successfully edited aircraft\n"+type+" to capacities\n"
               +"First: "+first+"\n"+"Business: "+business+"\n"+"Economy: "+economy,
               "Successful", JOptionPane.INFORMATION_MESSAGE);
          catch (Exception e) {
               JOptionPane.showMessageDialog(null,e.getMessage(),"Error",JOptionPane.ERROR_MESSAGE);
     public static void list (ArrayList aircraft) {
          JOptionPane.showMessageDialog(null, aircraft.size()+" aircraft found", "Found",JOptionPane.INFORMATION_MESSAGE);
          Object[] aircrafts;
          aircrafts = aircraft.toArray();
          JOptionPane.showMessageDialog(null, aircrafts);
     public static void save (ArrayList aircraft) {
          try {
               FileOutputStream fileout = new FileOutputStream(".\\Data\\Aircraft.bin");
               ObjectOutputStream objectout = new ObjectOutputStream(fileout);
               Object[] aircrafts;
               aircrafts = aircraft.toArray();
               objectout.writeObject(aircrafts);
               objectout.close();
               fileout.close();
               JOptionPane.showMessageDialog(null,aircraft.size()+" aircrafts saved", "Sucessful", JOptionPane.INFORMATION_MESSAGE);
          catch (IOException e) {
               JOptionPane.showMessageDialog(null,e.getMessage(),"Error",JOptionPane.ERROR_MESSAGE);
     public static void loadAircraft (ArrayList aircraft) {
          try {
               FileInputStream filein = new FileInputStream(".\\Data\\Aircraft.bin");
               ObjectInputStream objectin = new ObjectInputStream(filein);
               Aircraft craft = null;
               while ((craft=(Aircraft)objectin.readObject())!=null) {
                    aircraft.add(craft);
               objectin.close();
               filein.close();
          catch (Exception e) {}
Thanks for your help...^^

Answer 1

This class is the initialisation of the Aircraft
file...this stores the information of a particular
flight and the number of seats (first class, business
class, and economy class).
I want it to store the data as a 2d array that stores
both string and int...but then i couldnt find a way of
implementing the code.How about creating another class for this data instead of a two-dimensional array entry? If I understoof you correctly, these are "Flight" objects, with a destination (String) and a number of seats available(int).
How about simply creating those and adding them to a list?
You could further enhance that class with a passengers list...