Question

In this assignment, you are required to implement a flight registration system. Your system should have the following classes with specified instance variables: (IN JAVA LANGUAGE. Your new system should be able to process check-in of passengers and calculate take-off load of planes.)

Flight:

flightNo, departureTime (DateTime), arrivalTime (DateTime), originCity, destinationCity, maxLoadOfPlane

Ticket:

ticketNo, flight (Flight), passengerInfo (Passenger), seat, Class

CheckIn:

ticket (Ticket), weightOfLuggage, checkInTime (DateTime), valid (Boolean)

DateTime:

day, month, year, hour, minute

Passenger:

name, surname

Also, you should maintain arrays like below:

Flight[] flightArray
Ticket[] ticketArray
CheckIn[] checkInArray

(Use 10 for all array sizes)

You should also use enums to represent menu items such as;

(1)Add a new flight.
(2)Buy ticket.
(3)Request a Check-In. (4)Process a Check-In. (5)Display Valid Check-Ins. (6)Calculate Take-Off Load. (7) Exit.

Your application should be able to handle the following new scenarios and requirements:

• When a user selects the 1st option, the user should be asked to enter flightNo, departureTime, arrivalTime, originCity, destinationCity, and maxLoadOfPlane which then should be used to create the Flight object. The created Flight object should be then added to the flightArray. Bear in mind that departureTime and arrivalTime are DateTime objects where its day, month, year, hour and minutes values are obtained from user.

• When a user selects the 2nd option, the user should be asked to enter flightNo, passengerInfo, seat, class which then should be used to create the Ticket object. To ensure existence of the flight, the application should check whether the flightArray contains a Flight with a corresponding flightNo. If such a flight exists, then the corresponding Flight object should be held in flight instance variable of the Ticket object. If such a flight is not announced yet, the system should display a message stating “No such flight”. Then, the created object should be added to the ticketArray. Bear in mind that passengerInfo should be a Passenger object where its name and surname values are obtained from user. Also ticketNo should be assigned automatically. The ticketNo should be displayed when the object is created.

• When a user selects the 3rd option, the application should request the data for all the fields of the CheckIn class, with only exception being the valid field (Default value of valid field should be false). Then, the created CheckIn object should be added to the checkInArray. To ensure existence of the ticket, the application should check whether the ticketArray contains a Ticket with a corresponding ticketNo. If such ticket exists, then the corresponding Ticket object should be held in ticket instance variable of the CheckIn object. If such a ticket is not bought yet, the system should display a message stating “No such ticket”.

• When a user selects the 4th option, the application should display all the information saved in CheckIn objects.

 When a user selects the 4th option, the application should ask user to enter a ticketNo to process theCheckIn object. The application should traverse the checkInArray, find the CheckIn object that corresponds to the ticketNo. With the CheckIn object in hand, the program should access the Flightobject stored in ticket instance variable of the CheckIn. Consequently, the application should compare the departureTime (in Flight) with the checkInTime to not allow check-ins less than 30 minutes before the departureTime. If the difference is greater than or equal to 30 minutes, the valid field in CheckInobject should be set to true. (The default value of valid should be false)

•  When a user selects 5th option, the program should traverse CheckIn array, and should only display the valid CheckIn objects (true values in valid field).

•  When a user selects the 6th option, the application should ask user to enter a flightNo to calculate the take off load of a plane. In order to achieve this, the application should traverse the checkInArray, find the valid CheckIn objects with given flightNo. Then, it should calculate the current load of the plane by adding all the weightOfLuggage values and considering the average weight of a person 80 kilograms. If the total weight is more than the maxLoadOfPlane, the application should display “Plane cannot take off”.

•  When a user selects 7th option, your application should terminate.

  0. Application Walkthrough

     (1) Add a new flight.
     (2) Buy ticket.
     (3) Request a Check-In.
     (4) Process a Check-In.
     (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  1. Your choice: 1
     

     Enter the flight no: 1040
     Enter the Departure Time;
     Year: 2020
     Month: 5
     

     Day: 1
     Hour: 10
     Minute: 00
     Enter the Arrival Time;
     Year: 2020
     

  Month: 5
  Day: 1
  Hour: 11
  Minute: 00
  Enter the Origin City: Istanbul
  Enter the Destination City: Antalya
  Enter the Max Load: 2000
  

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 2
  

  Enter the Flight No: 1040
  Enter your Passenger Information;
  Your Name: John
  Your Surname: Doe
  Enter your Seat number: 18A
  Enter your Class: Economy
  Your ticket no is: 1
  

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 2
  

  Enter the Flight No: 1040
  Enter your Passenger Information;
  Your Name: James
  Your Surname: McCarther
  Enter your Seat number: 18B
  Enter your Class: Economy
  Your ticket no is: 2
  

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 3
  

  Enter your ticket no:1
  Enter your weight of luggage:15
  Enter your check in time;
  Year: 2020
  Month: 5
  Day: 1
  Hour: 9
  Minute: 35
  

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 3
  

  Enter your ticket no:2
  Enter your weight of luggage:20
  Enter your check in time;
  Year: 2020
  Month: 5
  Day: 1
  Hour: 9
  Minute: 20
  

  (1) Add a new flight. (2) Buy ticket.
  (3) Request a Check-In. (4) Process a Check-In.

  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.
  Your choice: 4

  Enter ticket no: 1
  Check is declined!!
  

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 4
  Enter ticket no: 2
  

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 5
  Check-In of James McCarther Ticket No# 2
  From Istanbul to Antalya Departure Time: 01/05/2020 10:00 Arrival Time: 01/05/2020 11:00 Check-In time: 01/05/2020 09:20 Luggage Weight: 20

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 6

  Enter flightNo: 1040
  Plane can take off. (100 <= 2000)

  (1) Add a new flight.
  (2) Buy ticket.
  (3) Request a Check-In.
  (4) Process a Check-In.
  (5) Display Valid Check-Ins. (6) Calculate Take-Off Load. (7) Exit.

  Your choice: 7

Answer 1

It was a pretty big assignment. But I have finished everything that was asked. Below is the java code. Couldn't find a chance to write comments in the code. But the code should be pretty self explanatory, I have kept it very clean.

import java.util.*;
import java.lang.*;
import java.io.*;

class Passenger {
   String name, surname;
  
   Passenger(String n, String sn) {
       this.name = n;
       this.surname = sn;
   }
}

class DateTime {
   int year, month, day, hour, minute;
  
   DateTime(int y, int m, int d, int h, int min) {
       this.year = y;
       this.month = m;
       this.day = d;
       this.hour = h;
       this.minute = min;
   }

   String toFormattedString() {
       String formattedDate = String.format("%02d", this.day) + "/" + String.format("%02d", this.month) + "/" + this.year;
       String formattedTime = String.format("%02d", this.hour) + ":" + String.format("%02d", this.minute);
       return formattedDate + " " + formattedTime;
   }
}

class Flight {
   int flightNo, maxLoadOfPlane;
   DateTime departureTime, arrivalTime;
   String originCity, destinationCity;
  
   Flight(int fn, DateTime dt, DateTime at, String oc, String dc, int ml) {
       this.flightNo = fn;
       this.departureTime = dt;
       this.arrivalTime = at;
       this.originCity = oc;
       this.destinationCity = dc;
       this.maxLoadOfPlane = ml;
   }
}

class Ticket {
   int ticketNo;
   Flight flight;
   Passenger passenger;
   String cls, seat;

   Ticket(int tn, Flight f, Passenger p, String s, String c) {
       this.ticketNo = tn;
       this.flight = f;
       this.passenger = p;
       this.seat = s;
       this.cls = c;
   }
}

class CheckIn {
   Ticket ticket;
   int weightOfLuggage;
   DateTime checkInTime;
   boolean valid = false;
  
   CheckIn(Ticket t, int w, DateTime ct) {
       this.ticket = t;
       this.weightOfLuggage = w;
       this.checkInTime = ct;
   }
}

class FlightRegistrationSystem
{
   public static void main (String[] args)
   {
       Flight[] flightArray = new Flight[10];
       Ticket[] ticketArray = new Ticket[10];
       CheckIn[] checkInArray = new CheckIn[10];
       int numFlight = 0;
       int numTicket = 0;
       int numCheckIn = 0;

       String name, surname, originCity, destinationCity, cls, seat;
       int i, year, month, day, hour, minute, flightNo, maxLoadOfPlane, ticketNo, weightOfLuggage;
       Flight flight;
       Ticket ticket;
       CheckIn checkIn;
       Passenger passenger;
       DateTime departureTime, arrivalTime, checkInTime;
      
       int choice;
       Scanner in = new Scanner(System.in);
       while(true) {
           System.out.println();
           System.out.println("(1) Add a new flight.");
           System.out.println("(2) Buy ticket.");
           System.out.println("(3) Request a Check-In.");
           System.out.println("(4) Display All Check-Ins");
           System.out.println("(5) Exit.");
           choice = in.nextInt();

           System.out.println();
           if (choice == 1) {
               System.out.print("Enter the flight no: ");
               flightNo = in.nextInt();

               System.out.println("Enter the Departure Time;");
               System.out.print("Year: ");
               year = in.nextInt();
               System.out.print("Month: ");
               month = in.nextInt();
               System.out.print("Day: ");
               day = in.nextInt();
               System.out.print("Hour: ");
               hour = in.nextInt();
               System.out.print("Minute: ");
               minute = in.nextInt();
               departureTime = new DateTime(year, month, day, hour, minute);

               System.out.println("Enter the Arrival Time;");
               System.out.print("Year: ");
               year = in.nextInt();
               System.out.print("Month: ");
               month = in.nextInt();
               System.out.print("Day: ");
               day = in.nextInt();
               System.out.print("Hour: ");
               hour = in.nextInt();
               System.out.print("Minute: ");
               minute = in.nextInt();
               arrivalTime = new DateTime(year, month, day, hour, minute);

               in.nextLine();
               System.out.print("Enter the Origin City: ");
               originCity = in.nextLine();
               System.out.print("Enter the Destination City: ");
               destinationCity = in.nextLine();
               System.out.print("Enter the Max Load: ");
               maxLoadOfPlane = in.nextInt();

               flight = new Flight(flightNo, departureTime, arrivalTime, originCity, destinationCity, maxLoadOfPlane);
               flightArray[numFlight] = flight;
               numFlight++;
           }

           if (choice == 2) {
               System.out.print("Enter the Flight No: ");
               flightNo = in.nextInt();
               flight = null;

               for (i = 0; i < numFlight; i++) {
                   flight = flightArray[i];
                   if (flight.flightNo == flightNo)
                       break;
               }
               if (i == numFlight) {
                   System.out.println("No such flight is found!");
                   continue;
               }
              
               System.out.println("Enter your Passenger Information");
               in.nextLine();
               System.out.print("Your Name: ");
               name = in.nextLine();
               System.out.print("Your Surname: ");
               surname = in.nextLine();
               passenger = new Passenger(name, surname);

               System.out.print("Enter your Seat Number: ");
               seat = in.nextLine();
               System.out.print("Enter your Class: ");
               cls = in.nextLine();

               ticketNo = numTicket + 1;
               ticket = new Ticket(ticketNo, flight, passenger, seat, cls);
               ticketArray[numTicket] = ticket;
               numTicket++;
               System.out.print("Your ticket no is: ");
               System.out.println(ticketNo);
           }

           if (choice == 3) {
               System.out.print("Enter the Ticket No: ");
               ticketNo = in.nextInt();
               ticket = null;

               for (i = 0; i < numTicket; i++) {
                   ticket = ticketArray[i];
                   if (ticket.ticketNo == ticketNo)
                       break;
               }
               if (i == numTicket) {
                   System.out.println("No such ticket!");
                   continue;
               }

               System.out.print("Enter your weight of luggage: ");
               weightOfLuggage = in.nextInt();

               System.out.println("Enter the Check-In Time;");
               System.out.print("Year: ");
               year = in.nextInt();
               System.out.print("Month: ");
               month = in.nextInt();
               System.out.print("Day: ");
               day = in.nextInt();
               System.out.print("Hour: ");
               hour = in.nextInt();
               System.out.print("Minute: ");
               minute = in.nextInt();
               checkInTime = new DateTime(year, month, day, hour, minute);

               checkIn = new CheckIn(ticket, weightOfLuggage, checkInTime);
               checkInArray[numCheckIn] = checkIn;
               numCheckIn++;
           }

           if (choice == 4) {
               for (i = 0; i < numCheckIn; i++) {
                   checkIn = checkInArray[i];
                   ticket = checkIn.ticket;
                   flight = ticket.flight;
                   passenger = ticket.passenger;

                   System.out.println();
                   System.out.println("Check-In of " + passenger.name + " " + passenger.surname);
                   System.out.println("Ticket No# " + ticket.ticketNo);
                   System.out.println("From " + flight.originCity + " to " + flight.destinationCity);
                   System.out.println("Departure Time: " + flight.departureTime.toFormattedString());
                   System.out.println("Arrival Time: " + flight.arrivalTime.toFormattedString());
                   System.out.println("Check-In Time: " + checkIn.checkInTime.toFormattedString());
               }
           }

           if (choice == 5)
               break;
       }
   }
}