🛒 E-Commerce System (Java)

📌 Description

A console-based E-Commerce System built using Java that simulates an online shopping platform with product hierarchy, shopping cart, and order management.

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🚀 Features

• View categorized products
• Add products to cart
• Update cart items
• Remove items from cart
• Checkout and place order
• Automatic discount calculation
• GST calculation (18%)

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🧱 OOP Concepts Used

• Abstraction (Abstract Product class)
• Inheritance (Electronics, Clothing, Book)
• Polymorphism (Discount calculation)
• Encapsulation

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🛠️ Tech Stack

• Java (Core)
• Collections (ArrayList)
• Date API

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📂 Project Structure

ecommerce/
│
├── products/
│   ├── Product.java
│   ├── ElectronicsProduct.java
│   ├── ClothingProduct.java
│   └── BookProduct.java
│
├── cart/
│   ├── CartItem.java
│   └── ShoppingCart.java
│
├── orders/
│   ├── Order.java
│   └── OrderManager.java
│
├── ECommerceSystem.java
├── README.md

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▶️ How to Run

1. Compile

javac ECommerceSystem.java

2. Run

java ECommerceSystem

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📊 Sample Output

=== E-COMMERCE SYSTEM ===

1. View Products
2. Add to Cart
3. View Cart

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📌 Example Products

• Smartphone X (Electronics)
• Cotton T-Shirt (Clothing)
• Java Programming Book (Books)

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🎯 Learning Outcomes

• Implementation of real-world OOP design
• Handling collections and objects
• Building modular applications
• Understanding e-commerce workflow

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🔮 Future Improvements

• Database integration
• Payment system
• User login system
• Web-based version

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👨‍💻 Author

Swapanil Gupta

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