Thread: A Java Clusterbomb

I am having a problem with my final assignment. Now it began with an apology from my prof on the said assignment because for the pass 9 weeks we have done projects that has focused on a small part like change colors, stream, inheritance, etc. Now the final is to place it all together, but we haven't done any examples based on anything remotely close on this and he apologized yet again.
So here is what he wanted:
Create a Java GUI business application. This program may be any business application of your choice. A few examples include order entry, inventory management, payroll processing, or work order management. The application needs to read and write to a sequential access file. You will need to incorporate graphics, events, exception handling, and inheritance. I e-mail my prof and his comment was "yes the assignment is a bit vauge and it asked to combine everything you learned this semester. However, we never covered how to write a complete program and thus lies the great wall. Just do the best that you can." Honestly?! this is my final here. So then I went and try to create a program based on plane reservation like so:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class Plane extends JApplet
           implements ActionListener {
   JTextField input;
   JLabel prompt1, prompt2;
   JButton yesButton, noButton;
   int section, seats[], smoking;
   int nonsmoking, people;
 
   public void init()
   {
      input = new JTextField( 4 );
      input.addActionListener( this );
      prompt1 = new JLabel( "Please type 1 for smoking" );
      prompt2 = new JLabel( "Please type 2 for nonsmoking" );
      yesButton = new JButton( "Yes" );
      noButton = new JButton( "No" );
      yesButton.addActionListener( this );
      noButton.addActionListener( this );
      yesButton.setEnabled( true );
      noButton.setEnabled( true );
 
      seats = new int[ 11 ];
      smoking = 6;      
      nonsmoking = 1;
 
      Container c = getContentPane();
      c.setLayout( new FlowLayout() );
      c.add( prompt1 );
      c.add( prompt2 );
      c.add( input );
      c.add( yesButton );
      c.add( noButton );
   }
 
   public void actionPerformed( ActionEvent e )
   {
      if ( e.getSource() == input && people <= 10 ) {
         section = Integer.parseInt( input.getText() );
         String s = "";
 
         if ( section == 1 ) {
 
            if ( smoking <= 10 && seats[ smoking ] == 0 ) {
               s = "Smoking. Seat #" + smoking;
               seats[ smoking++ ] = 1;
               people++;
            }
            else if ( smoking > 10 && nonsmoking <= 5 ) {
 
               // enable buttons
               yesButton.setEnabled( true );
               noButton.setEnabled( true );
 
               s = "Smoking is full. Non-smoking?";
            }
            else
               s = "Next flight leaves in 3 hours.";
         }
         else if ( section == 2 ) {
 
            if ( seats[ nonsmoking ] == 0 && nonsmoking <= 5 ) {
               s = "Nonsmoking. Seat #" + nonsmoking;
               seats[ nonsmoking++ ] = 1;
               people++;
            }
            else if ( nonsmoking > 5 && smoking <= 10 ) {
 
               // enable buttons
               yesButton.setEnabled( true );
               noButton.setEnabled( true );
 
               s = "Nonsmoking is full. Smoking?";
            }
            else
               s = "Next flight leaves in 3 hours.";
         }
         else
            s = "Invalid input.";
 
         showStatus( s );         
      }
      else if ( e.getSource() == yesButton ) {
 
         if ( section == 1 ) {
            showStatus( "Your seat assignment is " + nonsmoking );
            seats[ nonsmoking++ ] = 1;         
         }
         else {  // section is 2
            showStatus( "Your seat assignment is " + smoking );
            seats[ smoking++ ] = 1;     
         }
 
         ++people;
         noButton.setEnabled( true);
         yesButton.setEnabled( true );
      }
      else if ( e.getSource() == noButton ) {
         showStatus( "Next flight leaves in 3 hours." );
         noButton.setEnabled( true );
         yesButton.setEnabled( true );
      }
   }
}

Just as I thought I had it. It is just not working. I am in my wits ends and I need some guidance. It compiles but when it runs it don't run properly. What I have I done wrong? Please help.

After having a closer look at your code, I have been able to take out most of the mistakes. However, 3 remains, since you use an undeclared or initiated variable e

else if (e.getSource() ==  yButton)

It is used 3 times.

Else it was a matter of typos so far. I can not test the code closer till i get more info on this e variable.

What you as an editor? You should really look into getting a proper IDE, eclipse caught most of these errors right away.

PS. Your code is very "ugly" in the sense that it is poorly formatted, there is not a single comment (comments are really essential when presenting code to other people) and you do a little of everything here and there and everywhere. Put related stuff in methods, if you dont feel it deserves its own classes.

You seem to have the right idea on many points. Sometimes, the most effective way to solve a problem, is to actually taking a break and come back later. Hang in there, with practice and time you WILL get the hang of it.

Typos removed:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
 
public class FinalAssignment extends JFrame implements ActionListener
{
  FlowLayout flow = new FlowLayout();
  private JLabel headTitle = new JLabel("Passenger List");
  private Font headFont = new Font ("Courier", Font.ITALIC, 18);
  private JLabel enterName = new JLabel ("Enter the passenger's Full Name");
  private JTextField inputName = new JTextField(10);
  private JLabel address = new JLabel("Address");
  private JTextField inputAddress = new JTextField(15);
  private JButton enterData = new JButton("Enter Data");
  int section, seats[], asile;
  int window, people;
  private JLabel win = new JLabel ("Press 1 for Window seat");
  private JLabel asi = new JLabel ("Press 2 for Asile");
  private JButton yButton = new JButton ("Yes");
  private JButton nButton = new JButton ("No");
  private JTextField input = new JTextField(5);
  private Container con = getContentPane();
  DataOutputStream outStream;
 
 
  public static void main(String[] args)
  {
    FinalAssignment fAssign = new FinalAssignment();
    fAssign.setSize(600, 220);
    fAssign.setVisible(true);
  }
  String[] airlines = {"Jet Blue", "Delta", "American"};
  JComboBox airLines = new JComboBox(airlines);
  JLabel mainLabel = new JLabel("Please Select your Airline:");
  JLabel actionLabel = new JLabel("Selected Airline: None");
  FinalAssignment fA = new FinalAssignment();
 
  public FinalAssignment()
  {
    super("Victor E. Campudoni-Final-Assignment");
    try
    {
      outStream = new DataOutputStream(new FileOutputStream("PassList.dat"));
    }
    catch(IOException ex)
    {
      System.err.println("File not opened");
      System.exit(1);
    }
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    headTitle.setFont(headFont);
    mainLabel.setFont(headFont);
    con.setLayout(flow);
    con.add(mainLabel);
    con.add(airLines);
    con.add(actionLabel);
    con.add(headTitle);
    con.add(enterName);
    con.add(inputName);
    con.add(address);
    con.add(inputAddress);
    con.add(enterData);
    con.add(win);
    con.add(asi);
    con.add(input);
    con.add(yButton);
    con.add(nButton);
    airLines.addActionListener(this);
    enterData.addActionListener(this);
    yButton.addActionListener(this);
    nButton.addActionListener(this);
    setVisible(true);
    yButton.setEnabled(true);
    nButton.setEnabled(true);
 
    seats = new int[11];
    asile = 6;
    window = 1;
  }
  public void actionPerformed (ActionEvent e1)
  {
    int i = airLines.getSelectedIndex();
    if(i < 0)
      return;
    actionLabel.setText("Your AirLine is: " + airLines.getItemAt(i));
    {
    if (e.getSource() == input && people <= 10)
    {
      section = Integer.parseInt(input.getText());
      String s = "";
      if (section == 1)
      {
        if (window <= 10 && seats [window] == 0)
        {
          s = "Window. Seat #" + window;
          seats [window++] = 1;
          people++;
        }
        else if (window > 10 && asile <= 5)
        {
          yButton.setEnabled(true);
          nButton.setEnabled(true);
          s = "Window is full. Asile seat?";
        }
        else
          s = "Your flight leaves in 3 hours.";
      }
      else if (section == 2)
      {
        if (seats [asile] == 0 && asile <= 5)
        {
          s = "Asile. Seat #" + asile;
          seats [asile++] = 1;
          people++;
        }
        else if (asile > 5 && window <= 10)
        {
          yButton.setEnabled(true);
          nButton.setEnabled(true);
          s = "Asile seating is full. Window Seat?";
        }
        else
          s = "Your flight leaves in 3 hours.";
      }
      else
        s = "Invalid Input.";
      System.out.println(s);
    }
    else if (e.getSource() == yButton)
    {
      if (section == 1)
      {
        System.out.println("Your seat assignment is " + window);
        seats [window++] = 1;
      }
      ++people;
      nButton.setEnabled(true);
      yButton.setEnabled(true);
    }
    else if (e.getSource() == nButton)
    {
      System.out.println("Your flight leaves in 3 hours.");
      nButton.setEnabled(true);
      yButton.setEnabled(true);
    }
    try
    {
      outStream.writeUTF(inputName.getText());
      outStream.writeUTF(inputAddress.getText());
 
      inputName.setText("");
      inputAddress.setText("");
    }
    catch(IOException e2)
    {
      System.err.println("Error writing file");
      System.exit(1);
    }
    }
  }
}