COIT 20245 Java Program using Array of Objects

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COIT 20245 Java Program using Array of Objects

BUGEN 5930 Business, Society & the Planet

COIT 20245 Java Program


This assessment item relates to the course learning outcomes as stated in the Unit Profile.



For this assignment, you are required to develop a Menu Driven Console Java Program to demonstrate you can use Java constructs including input/output via GUI dialogs, Java primitive and built-in types, Java defined objects, arrays, selection and looping statements and various other Java commands. Your program must produce the correct results.

The code for the menu and option selection is supplied: Hotel and is available on the unit website, you must write the underlying code to implement the program. The menu selections are linked to appropriate methods in the given code. Please spend a bit of time looking at the given code to familiarise yourself with it and where you have to complete the code. You will need to write comments in the supplied code as well as your own additions.

What to submit for this assignment

The Java source code:

  • java Hoteljava

If you submit the source code with an incorrect name you will lose marks.

A report including an UML class diagram of your Booking class, how long it took to create the whole program, any problems encountered and screen shots of the output produced. (Use Alt-PrtScrn to capture just the application window and you can paste it into your Word document). You should test and annotate every possibility in the program.

  • docx

You will submit your files by the due date using the “Assignment 2” link on the Moodle course website under Assessment … Assignment 2 Submission.


Assignment Specification

You have completed the console program for processing bookings at the Rocky Budget Hotel. We are going to extend this application so the customer’s name and days to stay at the hotel can be stored in an array of objects, do not use ArrayList.

The program will run via a menu of options, the file Hoteljava has been supplied (via the Moodle web site) which supplies the basic functionality of the menu system.


Booking class

First step is to create a class called Booking ).

The Booking class will be very simple it will contain two private instance variables:

  • name as a String
  • days as an integer


You should also have constants for the varying daily rates i.e $110, $100, $90 and $70.

The following public methods will have to be implemented:

  • A default constructor
  • A parameterised constructor o Two set methods (mutators) o Two get methods (accessors)


o A method calculateCharges() to calculate and return the total charge. This calculation will be the same as in assignment one i.e. First day is $110, the next two days will be $100 per day, the next four days will be $90 per day and the following week will be $70 per day with a maximum of 14 days in total.

Note: following basic database principles, calculated values are not usually stored, so in this case we will not store the charges as a instance variable, but use the calculateCharges() method when we want to access the charges.


Hotel class

Once the Booking class is implemented and fully tested we can now start to implement the functionality of the menu system

Data structures

For this assignment we are going to store the customer names and days to stay in an array of Booking objects.

Declare an array of Booking objects as an instance variable of the Hotel class, the array should hold twenty bookings.

You will need another instance variable (integer) to keep track of the number of the bookings being entered and use this for the index into the array of Booking objects.


Menu options

  1. Enter customer name and days to stay: enterBooking()

For assignment two we are going to use the GUI dialog showInputDialog() for our input. You will need to create the following two dialogs to receive the input from the user. You will not implement the functionality of the cancel key (need to use exceptions for this). Use Integer.parseInt() to convert the number as a string into an integer for the number of days to stay.

Data validation (you can implement this after you have got the basic functionality implemented) You will need to validate the user input using a validation loop.

The customer name cannot be blank i.e. not null and the days to stay cannot be blank and days needs to be between one and fourteen (1-14) inclusive, the same as assignment one.


Output the following error dialogs:

When the customer name and days to stay have been entered successfully into two local variables you will need to add these values into the Booking object array, you will also need to increment a counter to keep track of the number of bookings you have entered and the position in the array of the next booking to be entered


When the maximum number of bookings is reached (20) do not attempt to add any more bookings and give the following error message:

When the booking details have been successfully entered, display the details of the booking and the charge on the console screen.

Note: For the three options, display all, statistics and search you should ensure at least one booking has been entered and give an appropriate error message if there are no bookings entered and for the sorting option you must ensure at least two bookings have been entered, for example:


  1. Display all bookings: displayAllBookings()

When this option is selected display all of the bookings which have been entered so far.


  1. Display statistics: displayStatistics()

When this option is selected you will display the statistics as per assignment one. You can loop through your array of objects to calculate this information.


  1. Search for booking: searchBookings()

You can just use a simple linear search which will be case insensitive. Use the showInputDialog() method to input the name (you can share this functionality from enter name in enter booking).


  1. Sort the bookings: sortBookings()

This option you will sort the bookings alphabetically (ignore case) by the customer names, you can use any sorting algorithm which you like, do not use any in-built sort methods. Display the sorted list after the sort is complete.


Extra Hints

Your program should be well laid out, commented and uses appropriate and consistent names (camel notation) for all variables, methods and objects.

Make sure you have no repeated code (even writing headings in the output)

Constants must be used for all numbers in your code.

Look at the marking criteria to ensure you have completed all of the necessary items Refer to a Java reference textbook and the unit and lecture material (available on the unit website) for further information about the Java programming topics required to complete this assignment.

Check output, check code and add all of your comments, complete report and the UML class diagram.

Supplied Code

Download, compile and run the supplied code available from the unit web site.

You will see the menu interface has been implemented and you have to implement the underlying code, use the supplied method stubs and add you own methods. Again no code should be repeated in your program.

Marking Scheme


  Total number of marks – 30  
1 Variables, constants and types  
  Variables have meaningful names and use camel notation 0.5
  Variables are the correct type and constants are used 0.5
  Array of objects is used 1
2 Code in general  
  Code is indented and aligned correctly 1
  Code is easy to read (use of vertical whitespace) 0.5
  Code has header comment which includes name, student ID,  
  date, file name and purpose of the class 0.5
  Code is fully commented including all variables and methods 0.5
  No repeated code 1
3 Booking class  
  Instance variables are correct and private 0.5
  Default and parameterised constructors are correct 0.5
  Method for calculating charges is correct 1
  Get and set methods are correct 1
4 Hotel class — enter name and days to stay  
  Customer name is read correctly 0.5
  Days to stay is read correctly 0.5
  Data is added to the object array correctly 2
  Output matches the specification 1
  Charges calculated correctly 0.5
  Error dialog when maximum bookings is reached 0.5
  Error dialog when customer name not entered 0.5
  Error dialog when days is blank or is out of range 0.75
  Data validation loops are correct 0.25
5 Display all bookings  
  All records displayed 2
  Output matches the specification 1
6 Display statistics  
  Maximum and minimum are correct 0.5
  Average is correct 0.5
  Total charges is correct 0.5
  Output matches the specification 1
7 Search  
  Search is correct and correct details returned 2
  Search is case insensitive 0.5
  “ not found” is correct 0.5
8 Sort  
  Sort is correct and inbuilt sorting methods not used 2
  Sort is case insensitive 0.5
  Sorted list is displayed after sort 0.5
9 General  
  Welcome and exit message (as per assignment one) 0.5
  No bookings entered is handled correctly 0.5
  Correct files submitted including types and names 0.5
10 Report  
  UML class diagram of Booking class is correct 1
  Screen shot(s) of testing and annotations 0.5
  Report presentation and comments including how long it took  
  and any problems encountered 0.5


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