Shopping-Cart-Using-Java

This Java project implements a simple shopping cart system using a custom-built HashMap data structure. The cart allows users to add, remove, and view products while calculating the total price of all items in the cart.

📁 Project Structure

• HashMap.java: Implements a custom hash map to store products and their quantities. It handles operations like put, remove, resize, and calculates total cart value.
• ShoppingCart.java: Provides methods for adding, removing, displaying cart contents, and getting the total price.
• ShoppingCartDriver.java: Demonstrates how to use the shopping cart system through a main method.

📦 Key Features

• ✅ Custom implementation of HashMap using linked list chaining
• 🛒 Add and remove products with quantity tracking
• 💰 Calculate the total price of all products in the cart
• 📈 Automatically resizes the underlying structure as the load increases
• 🖨️ Clean toString() overrides for meaningful output

📘 Product Class

Each Product object contains:

• id – Unique identifier
• name – Name of the product
• price – Price per unit

Equality and hashcode are overridden based on the product ID to ensure correct behavior in the HashMap.

🧪 Sample Output

Product ID: 5, Name: airBuds, Price: 25900.0, Quantity: 3
Product ID: 4, Name: iWatchPro, Price: 69900.0, Quantity: 1
Product ID: 3, Name: m3Air, Price: 109900.0, Quantity: 2
Product ID: 2, Name: iPad, Price: 56900.0, Quantity: 1
Product ID: 1, Name: iP16Pro, Price: 69900.0, Quantity: 1
Total Cart Price: 497300.0

📚 Concepts Practiced

-Custom data structures in Java -Hashing and collision handling (chaining) -Object-oriented programming (OOP) concepts -Encapsulation and class design

🙌 Acknowledgments

This project was built as part of a learning exercise to understand how HashMaps work under the hood and apply them in a practical use-case like a shopping cart.

Feel free to reach out!

📌 Author: Devansh 📅 mail: devanshdmp15@gmail.com