159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
Assignment 3
Deadline: 2 June 2022, 11pm
Evaluation: 40 marks (20% of your final grade)
Late Submission: Deduct 5 marks per day late
Individual Work You must complete this assignment by yourself (you must NOT share your code
with others or use others’ code)
Purpose: Reinforce Java OOP core concepts (abstraction, encapsulation, inheritance, and
polymorphism), collections framework and generics, exception handling, input and
output streams, and GUI using Swing
1. System Description (Overview of Problem)
You are asked to write a program in Java to simulate a computer store’s management system
A computer store maintains three categories of computers: Desktop PCs, Laptops, and Tablets. Each
category is further divided into different types, as listed below:
Desktop PC types: Gaming, Home & Study, Business, and Compact
Laptop types: Gaming, Home & Study, Business, and Thin & Light
Tablet types: Android, Apple, and Windows
Each computer’s unique ID, brand, CPU family, and price need to be specified regardless of its category.
The computer store must also record memory size (GB) and SSD capacity (GB) for Desktop PCs and
Laptops as well as screen size (inches) for Laptops and Tablets.
The computer store has two types of staff: salespersons and managers. A salesperson can log into the
computer store’s management system to view a list of all computers and sort them. A salesperson can also
search for computers by category and type before clicking on a search result to view that computer’s
details.
A manager can log into the computer store’s management system to do everything that a salesperson can
do, but a manager can also maintain records—by updating computer details or adding and deleting
computers.
2. Tasks to complete:
a) Create a narrative step-by-step storyboard using screenshots of your system-generated GUIs to
demonstrate required functions of the computer store’s management system (please refer to a
sample at the end of this document; you can use its format to present your work)
Your Java code should:
b) Import the provided test data (computers.txt) to your system using Java Input
c) Add five staff to the computer store’s system—three salespersons and two managers—using usernames
and passwords provided (this function should have classes designed with an appropriate inheritance
hierarchy that applies core OOP concepts)
d) Realize all functions specified in the system description above (for this assignment, you are NOT
required to update computers.txt file after a manager update/add/delete records, you only need to
update the GUI to show the change)
3. Design and Implementation Guidelines
Note: You will receive credit for correctness, completeness, no code duplication, and clear on-screen outputs.
Also, we will grade your program using the following OOP and general software implementation
guidelines:
1) Encapsulation design and implementation—proper use of modifiers
a. Private/Protected/Public
b. Must make use of getters and/or setters wherever appropriate
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
2) Inheritance design and implementation
a. Reasonable class hierarchies
b. Proper data fields separation in base and derived classes
c. Proper methods separation/overloading/overriding in base and derived classes
d. Proper use of base and derived class constructors
3) Polymorphism and implementation
a. Write generic code that targets the base class whenever possible
b. Appropriate use of overriding in derived classes to realize polymorphism
4) Information store and implementation
a. Use Hash Map and other Java collection class(es) to store information
5) Exception handling
a. Throw an exception object when an application error occurs (e.g., when an invalid piece of data is
entered)
b. Use “try/catch/finally” or “try/catch” block to handle the exception
6) Use Java Swing to implement your GUI
4. Other Specifications
You must follow the next three specifications when completing this assignment:
1) Place appropriate comments in your program—e.g.:
/** explain what the program file is doing . . . */
// explain what a part/method of the program is doing…
2) DO NOT add any file path for ‘computers.txt’ (put it directly in your project folder when you test your
code)
3) DO NOT add your own package name(s) to the beginning of your .java files (this requirement is only
for marking purpose)
5. Submission Requirements:
1) Your storyboard as a PDF file
2) All your .java files (source codes)
3) Zip all your files (PDF file and .java files) together and submit as a single file to Stream
6. You MUST use the following test data in your assignment:
1) Staff details
Usernames Passwords
Staff 1 – Salesperson p1 p1
Staff 2 – Salesperson p2 p2
Staff 3 – Salesperson p3 p3
Staff 4 – Manager m1 m1
Staff 5 – Manager m2 m2
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
2) Input file computers.txt to download
3) Example GUI and functions narrations:
Note: this is just a sample GUI design; you are free to design your own GUI and function flow as long
as they are reasonable and complete the tasks listed in item “2.” above
When the program runs:
Record of Desktop
PC:
Category,
Type,
ID,
Brand,
CPU Family,
Memory Size (GB),
SSD Capacity (GB),
Price ($)
Record of Laptop:
Category,
Type,
ID,
Brand,
CPU Family,
Memory Size (GB),
SSD Capacity (GB),
Screen Size (Inches),
Price ($)
Record of Tablet:
Category,
Type,
ID,
Brand,
CPU Family,
Screen Size (Inches),
Price ($)
Click “login” icon button
Log in as a salesperson
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
Can select and display
computers from any
Category (No specific
order required)
List of all computers
(No specific order required)
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
–
Can select and display
computers from any
Category and its sub type
Can click any selected
computer to check its
details
Note that all editing
functions are disabled
for a salesperson
Click to log out prelogin
screen is
displayed
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
This time, log in as a
manager (note that both
“Browse” and
“Check/Update” tabs
are enabled this time)
A manager can use all
the search functions
that a salesperson can
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
A manager can click
“Add” to add a new
computer (‘Model ID’
is unique, so a new
computer can’t use an
existing ‘Model ID’)
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
New computer’s
details reflected
in list
A manager can click
‘Update’ to update a
computer’s details;
any data can be
modified except
‘Model ID’
Pop-up window to
confirm success of
update
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
Update reflected in
this list
A manager can click
‘Delete’ to delete a
computer from the
system
Clicking ‘Clear’ will clear
all text fields’ values on
this tab too (but does not
actually change or delete a
computer’s data )
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159.234 OBJECT-ORIENTED PROGRAMMING S1, 2022
List also reflects
deletions
Click “Log out” to
go back to pre-login
screen