Build an Online Shopping Cart System Using OOP in Java | Step-by-Step Tutorial | Dev Portal
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In this tutorial, we will build a fully functional Online Shopping Cart System using Object-Oriented Programming (OOP) principles in Java. This project provides a great way to practice core OOP concepts like classes, inheritance, polymorphism, and encapsulation. While this is a dummy project to demonstrate these concepts, it can be easily extended to create a more robust and reliable system.
What You’ll Learn:
In this project-based tutorial, we’ll focus on the following OOP principles and how to implement them:
Encapsulation: Keep the data secure by using private fields and public methods.
Inheritance: Extend class functionality for code reusability.
Polymorphism: Use flexible methods to handle different object behaviors.
Project Breakdown:
1. Product Class: We’ll start by defining a Product class that represents the items available in the store. Each product will have attributes like a unique ID, name, price, and quantity. You'll learn how to:
Create constructors for initializing objects.
Use getter and setter methods to manipulate object properties.
Display product information to the user using a displayProduct() method.
2. Cart Class: The Cart class will be responsible for managing the products that users add to their shopping cart. We'll cover:
Using an ArrayList to store products dynamically.
Implementing methods to add, remove, and display products in the cart.
Calculating the total cost of all items using the calculateTotalCost() method.
3. User Class: Here, we will represent the customer as a User object, which links the user to their personal shopping cart. This class will:
Hold user information such as the name.
Provide a Cart object for managing the shopping cart actions.
4. Shop Class: The Shop class acts as the online store where users can browse and select products. We’ll:
Create an inventory of products with pre-loaded items.
Implement methods to find and display available products.
Simulate real-world shopping behavior with product search by ID.
5. Main Application (OnlineShoppingApp): Finally, we’ll tie all the components together in the OnlineShoppingApp class. You’ll learn to:
Build a menu-driven system that allows users to:
Add products to the cart.
Remove products from the cart.
View all items in the cart.
Checkout and calculate the total cost.
Use Java’s Scanner to accept user input, making the shopping experience interactive.
Key Features:
Interactive User Experience: The program continuously prompts the user to choose options like adding or removing products from the cart, making it easy to simulate a real shopping experience.
Data Encapsulation: All product and cart details are encapsulated within their respective classes, ensuring data security and clear code structure.
Scalable Design: The structure is designed to be easily extendable. You can add new features such as:
1. Applying discounts.
2. Handling inventory updates.
3. Integrating with a database for product storage.
Expand the Project: Once you’ve built the basic system, feel free to experiment by adding additional features such as:
Product Categories: Organize products by categories like electronics, clothing, etc.
User Authentication: Add login/logout functionality to manage multiple users.
Payment Integration: Simulate payment processing for a more realistic e-commerce experience.
Source Code: You can find the full code for this project on GitHub: https://github.com/nakulmitra/java-tu...
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Time Stamps:
00:00 - Introduction
01:05 - Defining Product class
03:44 - Defining Cart class
17:29 - Defining User class
19:15 - Defining Shop class
23:51 - Main class(OnlineShoppingApp)
36:21 - Code execution
Keywords:
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OOP ka use karke Java project
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