用Java写超市购物系统的代码

非常感谢您的提问，以下是一个简单的超市购物系统的Java代码：

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

public class Supermarket {

    private Map<String, Double> products;
    private Map<String, Integer> inventory;

    public Supermarket() {
        products = new HashMap<>();
        inventory = new HashMap<>();
    }

    public void addProduct(String name, double price, int quantity) {
        products.put(name, price);
        inventory.put(name, quantity);
    }

    public void buyProduct(String name, int quantity) {
        if (inventory.containsKey(name)) {
            int currentQuantity = inventory.get(name);
            if (currentQuantity >= quantity) {
                inventory.put(name, currentQuantity - quantity);
                double totalPrice = quantity * products.get(name);
                System.out.println("购买成功！您购买了 " + quantity + " 个 " + name + "，总价为 " + totalPrice + " 元。");
            } else {
                System.out.println("购买失败！库存不足。");
            }
        } else {
            System.out.println("购买失败！该商品不存在。");
        }
    }

    public static void main(String[] args) {
        Supermarket supermarket = new Supermarket();
        supermarket.addProduct("苹果", 5.0, 10);
        supermarket.addProduct("香蕉", 3.0, 20);
        supermarket.addProduct("橙子", 4.0, 15);

        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入您要购买的商品名称和数量（用空格隔开），输入 q 退出：");
            String input = scanner.nextLine();
            if (input.equals("q")) {
                break;
            }
            String[] parts = input.split(" ");
            if (parts.length != 2) {
                System.out.println("输入格式错误，请重新输入。");
                continue;
            }
            String name = parts[0];
            int quantity;
            try {
                quantity = Integer.parseInt(parts[1]);
            } catch (NumberFormatException e) {
                System.out.println("数量输入错误，请重新输入。");
                continue;
            }
            supermarket.buyProduct(name, quantity);
        }
    }
}

希望这个代码能够帮到您！