Thread: Reading and Writing Text Files

Hello Everyone,

I am having a bit of trouble with a project I am working on. I am creating an Airline reservation system in which a user can select buttons 1-12 to book a seat. After booking the seat they receive an authorization number. The user can also select a booked seat to unbook if they enter the correct authorization number.
When a user goes to exit the program, the results of the reservation are saved to a text file (1 for unbooked, 0 for booked).

Up to this point I have the code working correctly. My only problem is that I also need to read input from the same text file so that when a user opens the program the seats are booked/unbooked in the same way they designated.

Any help would be greatly appreciated

Here is my code:

package airlinereservationsystem;
 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Scanner;
 
public class ReservationSystem extends JFrame implements ActionListener
{
    private int seatCounter = 0;
    private JLabel userInstructions = new JLabel("Click the button" +
            " representing the seat you want " +
        "to reserve the seat");
    private JButton[] buttonArray = new JButton[12];
    private JButton exitButton = new JButton("Click to Exit");
    private String authorization;
    private int[] bookedNumber = new int[12];
    private ArrayList<Boolean> seatList = new ArrayList<Boolean>(12);
    String fileName = "c:/temp/projectData.txt";
 
    public ReservationSystem()
    {
        super("SouthEast Airline Reservation System");
        addWindowListener(new WindowDestroyer( ));
        Container contentPane = getContentPane( );
        contentPane.setLayout(new BorderLayout( ));
        JPanel InstructionsPanel = new JPanel( );
        JPanel buttonPanel = new JPanel( );
        JPanel exitPanel = new JPanel( );
        ScannerReadFile();
 
        //add listener to the exit button
        exitButton.addActionListener(this);
 
 
        InstructionsPanel.add(userInstructions);
        contentPane.add(InstructionsPanel, BorderLayout.NORTH);
 
        buttonPanel.setLayout(new GridLayout(4,3));
 
        for (int i=0;i<12;i++)
        {
            buttonArray[i] = new JButton("Seat " + (i+1));
            buttonArray[i].addActionListener(this);
            buttonPanel.add(buttonArray[i]);
            seatList.add(i, true);
        }
 
        contentPane.add(buttonPanel,BorderLayout.CENTER);
        exitPanel.add(exitButton);
        contentPane.add(exitPanel,BorderLayout.SOUTH);
        pack();
 
 
    }
 
public void actionPerformed(ActionEvent e)
{
    String confirmExit = "Are you sure you want to exit?";
    String confirm = "Are you sure you want to book this seat?";
    for (int i = 0; i < 12; i++) {
    if (e.getActionCommand().equals("Seat " + (i + 1))) {
       int choice = JOptionPane.showConfirmDialog(null, confirm, "Confirm", JOptionPane.YES_NO_CANCEL_OPTION);
       if (choice == JOptionPane.YES_OPTION) {
          JOptionPane.showMessageDialog(null, "Your authorization number is 197", "", JOptionPane.INFORMATION_MESSAGE);
          buttonArray[i].setText("BOOKED");
          seatList.set(i, false);
          buttonArray[i].setToolTipText("Seat Occupied");
          buttonArray[i].setForeground(Color.red);
          buttonArray[i].setActionCommand("Booked");
          seatCounter++;
          if (seatCounter == 12) {
             JOptionPane.showMessageDialog(null, "Unfortunately the flight is booked. Please choose a different flight.", "", JOptionPane.INFORMATION_MESSAGE);
          }
          }
          }
    if (e.getActionCommand().equals("Booked")) {
       JOptionPane.showMessageDialog(null, "This seat is booked. Enter the authorization code to " + "cancel the reservation", "", JOptionPane.INFORMATION_MESSAGE);
       authorization = JOptionPane.showInputDialog("Enter the authorization number");
       bookedNumber[i] = Integer.parseInt(authorization);
       if (bookedNumber[i] == 197) {
          buttonArray[i] = (JButton) e.getSource();
          JOptionPane.showMessageDialog(null, "Your reservation has been cancelled", "", JOptionPane.INFORMATION_MESSAGE);
          buttonArray[i].setText("Available");
          buttonArray[i].setForeground(Color.black);
          seatCounter--;
          return;
        }
        if (bookedNumber[i] != 197) {
           JOptionPane.showMessageDialog(null, "Incorrect authorization number. Please contact customer service " + "to cancel the reservation", "", JOptionPane.INFORMATION_MESSAGE);
           return;
        }
     }
     }
     if (e.getActionCommand( ).equals("Click to Exit")){
        int choiceExit = JOptionPane.showConfirmDialog(null, confirmExit, "Confirm",
        JOptionPane.YES_NO_OPTION);
        if (choiceExit == JOptionPane.YES_OPTION){
            writeToFile();
            System.exit(0);
        }
        }
 
}
public void writeToFile(){
    PrintWriter outputStream = null;
    try{
      outputStream = new PrintWriter(fileName);
        }
        catch(FileNotFoundException e){
           System.out.println("Error opening the file " + fileName);
           System.exit(0);
        }
    for (int count = 0; count <12; count++){
        outputStream.println(seatList.get(count)?1:0);
    }
        outputStream.close( );
 
}
public void ScannerReadFile(){
    File filePath = new File("c:/temp/projectData.txt");
    try{
    Scanner scanner = new Scanner(filePath);
        while (scanner.hasNextLine()){
        String line = scanner.nextLine();
        System.out.println(line);
        }
    }
    catch (FileNotFoundException e) {
    e.printStackTrace();
    }
}
protected void processWindowEvent(WindowEvent e)
{
    if (e.getID() == WindowEvent.WINDOW_CLOSING){
       int exit = JOptionPane.showConfirmDialog(this, "Are you sure you want to exit?");
       if (exit == JOptionPane.YES_OPTION)
           writeToFile();
           System.exit(0);
    }
       else{
          super.processWindowEvent(e);
        }
 
}
 
}