宠物交易系统，分为宠物主人和宠物商店两种角色，宠物主人可以购买宠物或将已有的宠物卖给商店，宠物商店可以购买宠物、卖出宠物、培育宠物、查询待售宠物、查看商店账目和开设新的宠物商店。系统启动后会显示所有宠物主人、宠物和宠物商店信息，并提示两种角色登录。编写Java代码

好的，以下是一个简单的Java代码示例，实现了宠物交易系统的基本功能：

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

public class PetTradeSystem {
    // 宠物类
    public static class Pet {
        private String type; // 宠物类型
        private String name; // 宠物名字
        private int age; // 宠物年龄
        private int health; // 宠物健康值
        private int love; // 宠物爱心指数
        private String shop; // 所属商店

        public Pet(String type, String name, int age, int health, int love, String shop) {
            this.type = type;
            this.name = name;
            this.age = age;
            this.health = health;
            this.love = love;
            this.shop = shop;
        }

        public String getType() {
            return type;
        }

        public String getName() {
            return name;
        }

        public int getAge() {
            return age;
        }

        public int getHealth() {
            return health;
        }

        public int getLove() {
            return love;
        }

        public String getShop() {
            return shop;
        }

        @Override
        public String toString() {
            return "宠物类型：" + type + "，宠物名字：" + name + "，宠物年龄：" + age + "岁，宠物健康值：" + health + "，宠物爱心指数：" + love + "，所属商店：" + shop;
        }
    }

    // 宠物主人类
    public static class PetOwner {
        private String name; // 主人名字
        private int money; // 主人账户余额
        private ArrayList<Pet> pets; // 主人拥有的宠物

        public PetOwner(String name, int money) {
            this.name = name;
            this.money = money;
            this.pets = new ArrayList<>();
        }

        public String getName() {
            return name;
        }

        public int getMoney() {
            return money;
        }

        public void setMoney(int money) {
            this.money = money;
        }

        public ArrayList<Pet> getPets() {
            return pets;
        }

        public void addPet(Pet pet) {
            pets.add(pet);
        }

        public void removePet(Pet pet) {
            pets.remove(pet);
        }

        @Override
        public String toString() {
            return "主人名字：" + name + "，账户余额：" + money;
        }
    }

    // 宠物商店类
    public static class PetShop {
        private String name; // 商店名字
        private String password; // 商店密码
        private int money; // 商店账户余额
        private ArrayList<Pet> pets; // 商店拥有的宠物

        public PetShop(String name, String password, int money) {
            this.name = name;
            this.password = password;
            this.money = money;
            this.pets = new ArrayList<>();
        }

        public String getName() {
            return name;
        }

        public String getPassword() {
            return password;
        }

        public int getMoney() {
            return money;
        }

        public void setMoney(int money) {
            this.money = money;
        }

        public ArrayList<Pet> getPets() {
            return pets;
        }

        public void addPet(Pet pet) {
            pets.add(pet);
        }

        public void removePet(Pet pet) {
            pets.remove(pet);
        }

        @Override
        public String toString() {
            return "商店名字：" + name + "，账户余额：" + money;
        }
    }

    private static Scanner sc = new Scanner(System.in);
    private static ArrayList<PetOwner> petOwners = new ArrayList<>();
    private static ArrayList<PetShop> petShops = new ArrayList<>();
    private static ArrayList<Pet> pets = new ArrayList<>();
    private static ArrayList<String> logs = new ArrayList<>(); // 记录交易日志

    public static void main(String[] args) {
        // 添加几只宠物
        pets.add(new Pet("狗", "旺财", 3, 80, 90, "宠物之家"));
        pets.add(new Pet("猫", "咪咪", 2, 90, 80, "宠物之家"));
        pets.add(new Pet("鸟", "小鸟", 1, 70, 95, "宠物之家"));

        // 添加几个宠物主人
        petOwners.add(new PetOwner("张三", 100));
        petOwners.add(new PetOwner("李四", 50));

        // 添加几个宠物商店
        petShops.add(new PetShop("宠物之家", "123456", 500));
        petShops.add(new PetShop("宠物乐园", "654321", 300));

        while (true) {
            System.out.println("欢迎使用宠物交易系统，请选择登录角色：");
            System.out.println("1. 宠物主人");
            System.out.println("2. 宠物商店");
            System.out.println("3. 退出系统");
            int choice = sc.nextInt();
            sc.nextLine(); // 读取换行符

            switch (choice) {
                case 1:
                    petOwnerLogin();
                    break;
                case 2:
                    petShopLogin();
                    break;
                case 3:
                    System.out.println("感谢使用宠物交易系统，再见！");
                    System.exit(0);
                default:
                    System.out.println("无效选项，请重新选择！");
                    break;
            }
        }
    }

    // 宠物主人登录
    private static void petOwnerLogin() {
        System.out.println("请输入主人名字：");
        String name = sc.nextLine();
        for (PetOwner petOwner : petOwners) {
            if (petOwner.getName().equals(name)) {
                System.out.println("欢迎回来，" + name + "！");
                petOwnerOperate(petOwner);
                return;
            }
        }
        System.out.println("主人名字不存在，请重新选择登录角色！");
    }

    // 宠物主人操作
    private static void petOwnerOperate(PetOwner petOwner) {
        while (true) {
            System.out.println("请选择功能：");
            System.out.println("1. 购买宠物");
            System.out.println("2. 卖出宠物");
            System.out.println("3. 返回登录界面");
            int choice = sc.nextInt();
            sc.nextLine(); // 读取换行符

            switch (choice) {
                case 1:
                    buyPet(petOwner);
                    break;
                case 2:
                    sellPet(petOwner);
                    break;
                case 3:
                    return;
                default:
                    System.out.println("无效选项，请重新选择！");
                    break;
            }
        }
    }

    // 宠物商店登录
    private static void petShopLogin() {
        System.out.println("请输入商店名字：");
        String name = sc.nextLine();
        System.out.println("请输入商店密码：");
        String password = sc.nextLine();
        for (PetShop petShop : petShops) {
            if (petShop.getName().equals(name) && petShop.getPassword().equals(password)) {
                System.out.println("欢迎回来，" + name + "！");
                petShopOperate(petShop);
                return;
            }
        }
        System.out.println("商店名字或密码错误，请重新选择登录角色！");
    }

    // 宠物商店操作
    private static void petShopOperate(PetShop petShop) {
        while (true) {
            System.out.println("请选择功能：");
            System.out.println("1. 购买宠物");
            System.out.println("2. 卖出宠物");
            System.out.println("3. 培育宠物");
            System.out.println("4. 查询待售宠物");
            System.out.println("5. 查看商店结余");
            System.out.println("6. 查看商店账目");
            System.out.println("7. 开设新的宠物商店");
            int choice = sc.nextInt();
            sc.nextLine(); // 读取换行符

            switch (choice) {
                case 1:
                    buyPet(petShop);
                    break;
                case 2:
                    sellPet(petShop);
                    break;
                case 3:
                    breedPet(petShop);
                    break;
                case 4:
                    showPets(petShop.getPets());
                    break;
                case 5:
                    System.out.println("商店账户余额：" + petShop.getMoney());
                    break;
                case 6:
                    showLogs(petShop.getName());
                    break;
                case 7:
                    createPetShop();
                    break;
                default:
                    System.out.println("无效选项，请重新选择！");
                    break;
            }
        }
    }

    // 购买宠物
    private static void buyPet(Object obj) {
        ArrayList<Pet> availablePets = new ArrayList<>();
        for (Pet pet : pets) {
            if (pet.getShop().equals("宠物之家") || obj instanceof PetShop && pet.getShop().equals(((PetShop) obj).getName())) {
                availablePets.add(pet);
            }
        }
        showPets(availablePets);
        System.out.println("请选择要购买的宠物编号：");
        int index = sc.nextInt();
        sc.nextLine(); // 读取换行符
        Pet pet = availablePets.get(index - 1);
        if (pet.getAge() <= 5) {
            petOwners.get(0).setMoney(petOwners.get(0).getMoney() - 5);
            if (obj instanceof PetShop) {
                ((PetShop) obj).setMoney(((PetShop) obj).getMoney() + 5);
            } else {
                pet.setShop(((PetOwner) obj).getName());
            }
            logs.add("购买宠物：" + pet.getName() + "，价格：5元");
        } else {
            petOwners.get(0).setMoney(petOwners.get(0).getMoney() - 3);
            if (obj instanceof PetShop) {
                ((PetShop) obj).setMoney(((PetShop) obj).getMoney() + 3);
            } else {
                pet.setShop(((PetOwner) obj).getName());
            }
            logs.add("购买宠物：" + pet.getName() + "，价格：3元");
        }
        if (obj instanceof PetShop) {
            ((PetShop) obj).addPet(pet);
        } else {
            ((PetOwner) obj).addPet(pet);
        }
        System.out.println("购买成功！");
    }

    // 卖出宠物
    private static void sellPet(Object obj) {
        PetOwner petOwner = null;
        PetShop petShop = null;
        if (obj instanceof PetOwner) {
            petOwner = (PetOwner) obj;
        } else {
            petShop = (PetShop) obj;
        }
        showPets(petOwner != null ? petOwner.getPets() : petShop.getPets());
        System.out.println("请选择要卖出的宠物编号：");
        int index = sc.nextInt();
        sc.nextLine(); // 读取换行符
        Pet pet = petOwner != null ? petOwner.getPets().get(index - 1) : petShop.getPets