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$159\mathrm{.}234$ OBJECT$-$ORIENTED PROGRAMMING S$1,2024$

Assignment $3$

Deadline: $4$ June $2024,11$pm

Evaluation: $40$ marks $(20\%$ of your final grade$)$

Late Submission: Deduct $4$ 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. 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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$159\mathrm{.}234$ OBJECT$-$ORIENTED PROGRAMMING S$1,2024$

$2)$ 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 HashMap 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