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E-commerce Platform in Java (Source Code)

Key Components

1. Product Catalog – Stores and displays products.
2. Shopping Cart – Allows users to add and manage items.
3. Order Management – Handles placing orders.
4. User Authentication – Manages user registration and login.
5. Simple Console-based Interface – For interaction.

1. Product Class

2. ProductCatalog Class

This class manages the list of products.

3. ShoppingCart Class

import java.util.HashMap;
import java.util.Map;

public class ShoppingCart {
    private Map<Product, Integer> cart;

public ShoppingCart() {
        cart = new HashMap<>();
    }

public void addProduct(Product product) {
        cart.put(product, cart.getOrDefault(product, 0) + 1);
    }

public void removeProduct(Product product) {
        cart.remove(product);
    }

public void viewCart() {
        double total = 0;
        System.out.println("Shopping Cart:");
        for (Map.Entry<Product, Integer> entry : cart.entrySet()) {
            Product product = entry.getKey();
            int quantity = entry.getValue();
            System.out.println(product.getName() + " - Quantity: " + quantity + " - Price: $" + product.getPrice());
            total += product.getPrice() * quantity;
        }
        System.out.println("Total Price: $" + total);
    }

public double getTotalPrice() {
        double total = 0;
        for (Map.Entry<Product, Integer> entry : cart.entrySet()) {
            Product product = entry.getKey();
            int quantity = entry.getValue();
            total += product.getPrice() * quantity;
        }
        return total;
    }
}

4. User Class

Manages user information for registration and login.

5. AuthenticationService Class

Handles user authentication.

6. Order Class

Manages an order after it is placed.

7. Main Class

This is the entry point for the console-based application.

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ProductCatalog catalog = new ProductCatalog();
        ShoppingCart cart = new ShoppingCart();
        AuthenticationService authService = new AuthenticationService();

System.out.println("Welcome to the E-commerce Platform");

// User Authentication
        System.out.print("Enter username: ");
        String username = scanner.nextLine();
        System.out.print("Enter password: ");
        String password = scanner.nextLine();

if (authService.authenticate(username, password)) {
            System.out.println("Login successful!");

while (true) {
                System.out.println("\n1. View Products");
                System.out.println("2. Add Product to Cart");
                System.out.println("3. View Cart");
                System.out.println("4. Checkout");
                System.out.println("5. Exit");
                System.out.print("Choose an option: ");
                int choice = scanner.nextInt();
                scanner.nextLine(); // Consume the newline character

if (choice == 1) {
                    // View products
                    for (Product product : catalog.getProducts()) {
                        System.out.println(product);
                    }
                } else if (choice == 2) {
                    // Add product to cart
                    System.out.print("Enter product ID to add to cart: ");
                    int productId = scanner.nextInt();
                    Product product = catalog.getProductById(productId);
                    if (product != null) {
                        cart.addProduct(product);
                        System.out.println(product.getName() + " added to cart.");
                    } else {
                        System.out.println("Product not found.");
                    }
                } else if (choice == 3) {
                    // View cart
                    cart.viewCart();
                } else if (choice == 4) {
                    // Checkout
                    Order order = new Order(cart);
                    order.placeOrder();
                    break; // Exit after checkout
                } else if (choice == 5) {
                    break; // Exit the program
                } else {
                    System.out.println("Invalid choice, please try again.");
                }
            }
        } else {
            System.out.println("Invalid login credentials.");
        }

scanner.close();
    }
}

How to Run:

1. Copy and paste all these classes into separate .java files.
2. Compile and run the Main class.
3. Follow the on-screen prompts to interact with the e-commerce system.

Key Features:

‣ Product catalog with sample products.
‣ User authentication for login.
‣ Shopping cart to add, view, and remove items.
‣ Basic checkout system to place orders.

With this code, you can develop E-commerce Platform in Java to fit your needs.