🛒 Simple E-commerce Cart System

This project is a basic e-commerce cart system developed in Java using Java Swing. It is designed as a practical implementation of core data structures for the Data Structures & Algorithms (BIC2214) module.

The system simulates the essential features of an online shopping platform, including cart management, order processing, and text-based data persistence.

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📌 Project Description

The main goal of this application is to demonstrate the use of Linked Lists and Queues in a real-world scenario.

Users can:

• Browse products
• Add/remove items from their shopping cart
• Place orders using a FIFO (First-In-First-Out) queue

All data (products, carts, orders) is stored in .txt files — no database required.

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✅ Features

🖼️ Graphical User Interface

• Built with Java Swing
• Simple and intuitive for smooth interaction

🛍️ Product Catalog

• Displays a list of products from a .txt file

🧺 Shopping Cart Management

• Add items to the cart
• Remove items from the cart
• View current cart items
• Calculate total price

📦 Order Processing

• Place orders (enqueue)
• Process orders in FIFO order (dequeue)

💾 Data Persistence

• All data is read from and saved to .txt files

⚙️ Performance Analysis

• Measures addItem() and removeItem() time in nanoseconds
• Supports performance tests with 100 and 150 items

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🧠 Data Structures Used

Structure	Purpose
LinkedList	Implements the shopping cart
Queue	Manages order processing (FIFO)

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💻 Technologies Used

• Language: Java
• UI: Java Swing
• File I/O: Standard Java I/O (FileReader, FileWriter)

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🚀 Setup & Installation

1. Install JDK
   Make sure Java is installed on your system.

2. Clone the Repository

   git clone https://github.com/your-username/simple-ecommerce-cart-system.git
   cd simple-ecommerce-cart-system
   

3. Compile the Code

   javac -d bin src/**/*.java

4. Run the Application

   java -cp bin ui.MainFrame

   Replace ui.MainFrame with the correct path to your main class if different.

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📊 Performance Analysis

The system includes a utility that uses System.nanoTime() to measure the time it takes to:

• Add 100 and 150 items to the cart
• Remove 100 and 150 items from the cart

These results are discussed in the final project report, with comparisons to theoretical Big O complexities.

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👥 Contributors

• [Your Name]
• [Group Member 2's Name]
• [Group Member 3's Name]
• [Group Member 4's Name]

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📁 Directory Structure (Simplified)

Simple E-Commerce Cart System/
├── Src/                  # Contains all Java source code for the application.
│   ├── Model/            # Defines the core data entities and business logic of the application.
│   │   ├── Cart.java             # Manages the user's shopping cart using a Linked List.
│   │   ├── CartItem.java         # Represents an individual product item within the shopping cart.
│   │   ├── Order.java            # Defines the structure for a customer's order.
│   │   ├── OrderManager.java     # Handles order creation, storage, and retrieval operations.
│   │   ├── OrderQueue.java       # Implements the queue for processing customer orders.
│   │   ├── Product.java          # Represents a product available in the e-commerce system.
│   │   ├── User.java             # Represents a system user with login credentials.
│   │   └── UserManager.java      # Manages user registration, authentication, and retrieval.
│   ├── Ui/                       # Contains Java Swing classes for the graphical user interface.
│   │   ├── LoginFrame.java       # Handles user login interface and authentication flow.
│   │   └── MainFrame.java        # Handles the main application window and user interactions.
│   └── App.java                  # The main entry point for the application.
└── Data/                         # Stores persistent application data in text files.
    ├── Orders.txt                # Stores records of processed customer orders.
    ├── Products.txt              # Contains the list of available products.
    └── Users.txt                 # Stores user-related information.

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🏛️ Educational Use

This system is developed strictly for educational purposes under the Data Structures & Algorithms course and is not intended for production or commercial use.