Untitled

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

public class ShoppingCart {
    private Map<Product, Integer> cartItems = new HashMap<>();

    public void addProduct(Product product, int quantity) {
        cartItems.put(product, cartItems.getOrDefault(product, 0) + quantity);
    }

    public void viewCart() {
        double total = 0;
        if (cartItems.isEmpty()) {
            System.out.println("Your cart is empty.");
            return;
        }
        for (Map.Entry<Product, Integer> entry : cartItems.entrySet()) {
            Product product = entry.getKey();
            int quantity = entry.getValue();
            double price = product.getPrice() * quantity;
            total += price;
            System.out.println(product + ", Quantity: " + quantity + ", Subtotal: $" + price);
        }
        System.out.println("Total Amount: $" + total);
    }

    public void checkout() {
        if (cartItems.isEmpty()) {
            System.out.println("Your cart is empty.");
        } else {
            viewCart();
            System.out.println("Thank you for your purchase!");
            cartItems.clear();
        }
    }
}