用java编写水果超市管理系统

好的，以下是一个简单的水果超市管理系统的Java代码示例，包括添加、删除、查询、修改水果信息等功能：

import java.util.ArrayList;
import java.util.Scanner;

public class FruitMarketManagementSystem {

    // 定义一个静态的 ArrayList 来存储水果信息
    private static ArrayList<Fruit> fruitList = new ArrayList<>();

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("欢迎使用水果超市管理系统！");
            System.out.println("请选择您要进行的操作：");
            System.out.println("1. 添加水果");
            System.out.println("2. 删除水果");
            System.out.println("3. 查询水果");
            System.out.println("4. 修改水果信息");
            System.out.println("5. 退出系统");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addFruit();
                    break;
                case 2:
                    deleteFruit();
                    break;
                case 3:
                    queryFruit();
                    break;
                case 4:
                    modifyFruit();
                    break;
                case 5:
                    System.out.println("谢谢使用水果超市管理系统，再见！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新选择！");
                    break;
            }
        }
    }

    // 添加水果
    private static void addFruit() {
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入水果名称：");
        String name = scanner.nextLine();

        System.out.println("请输入水果单价：");
        double price = scanner.nextDouble();

        System.out.println("请输入水果库存数量：");
        int stock = scanner.nextInt();

        Fruit fruit = new Fruit(name, price, stock);
        fruitList.add(fruit);

        System.out.println("添加成功！");
    }

    // 删除水果
    private static void deleteFruit() {
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入要删除的水果名称：");
        String name = scanner.nextLine();

        for (Fruit fruit : fruitList) {
            if (fruit.getName().equals(name)) {
                fruitList.remove(fruit);
                System.out.println("删除成功！");
                return;
            }
        }

        System.out.println("未找到该水果，删除失败！");
    }

    // 查询水果
    private static void queryFruit() {
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入要查询的水果名称：");
        String name = scanner.nextLine();

        for (Fruit fruit : fruitList) {
            if (fruit.getName().equals(name)) {
                System.out.println("水果信息如下：");
                System.out.println(fruit.toString());
                return;
            }
        }

        System.out.println("未找到该水果，查询失败！");
    }

    // 修改水果信息
    private static void modifyFruit() {
        Scanner scanner = new Scanner(System.in);

        System.out.println("请输入要修改的水果名称：");
        String name = scanner.nextLine();

        for (Fruit fruit : fruitList) {
            if (fruit.getName().equals(name)) {
                System.out.println("原水果信息如下：");
                System.out.println(fruit.toString());

                System.out.println("请输入新的水果名称（不修改请输入“0”）：");
                String newName = scanner.nextLine();
                if (!newName.equals("0")) {
                    fruit.setName(newName);
                }

                System.out.println("请输入新的水果单价（不修改请输入“0”）：");
                double newPrice = scanner.nextDouble();
                if (newPrice != 0) {
                    fruit.setPrice(newPrice);
                }

                System.out.println("请输入新的水果库存数量（不修改请输入“0”）：");
                int newStock = scanner.nextInt();
                if (newStock != 0) {
                    fruit.setStock(newStock);
                }

                System.out.println("修改成功！");
                return;
            }
        }

        System.out.println("未找到该水果，修改失败！");
    }
}

class Fruit {
    private String name;
    private double price;
    private int stock;

    public Fruit(String name, double price, int stock) {
        this.name = name;
        this.price = price;
        this.stock = stock;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

    @Override
    public String toString() {
        return "名称：" + name + "，单价：" + price + "元，库存数量：" + stock;
    }
}

注意：这只是一个简单的示例代码，实际的水果超市管理系统需要考虑更多的功能和细节，如数据持久化、权限管理、报表生成等。