使用Java完成以下代码群主发红包 群主发普通红包。某群有多名成员，群主给成员发普通红包。 普通红包的规则：（1）群主的一笔金额，从群主余额中和除，分成口份，让成员领取随机金额（假设随机金额在0.01 与剩余平均值* 2之 间）。 （2） 成员领取红包后，存儲到成员的余额中。 请根据上述描选，完成案例中所有类的定义以及指定类之间的 继承关系，并完成发红包。领红包的操作。

以下是使用Java实现的代码：

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

class User {
    private String name;
    private double balance;

    public User(String name, double balance) {
        this.name = name;
        this.balance = balance;
    }

    public void receiveRedEnvelope(double amount) {
        this.balance += amount;
    }

    public double checkBalance() {
        return this.balance;
    }

    public String getName() {
        return this.name;
    }
}

class GroupOwner extends User {
    public GroupOwner(String name, double balance) {
        super(name, balance);
    }

    public void sendRedEnvelope(int num, double amount) {
        double totalAmount = num * amount;
        if (totalAmount > this.checkBalance()) {
            System.out.println("余额不足，发红包失败");
            return;
        }
        this.balance -= totalAmount;
        List<Double> amounts = new ArrayList<>();
        RedEnvelope redEnvelope = new RedEnvelope(totalAmount, num);
        for (int i = 0; i < num; i++) {
            amounts.add(redEnvelope.getAmount());
        }
        System.out.println("红包已发送，金额为：" + amounts.toString());
    }

    public void manageBalance(double amount) {
        this.balance += amount;
    }
}

class RedEnvelope {
    private double totalAmount;
    private double remainingAmount;
    private int num;

    public RedEnvelope(double totalAmount, int num) {
        this.totalAmount = totalAmount;
        this.remainingAmount = totalAmount;
        this.num = num;
    }

    public double getAmount() {
        if (this.num == 1) {
            this.num--;
            return this.totalAmount;
        }
        double avg = this.remainingAmount / this.num * 2;
        Random random = new Random();
        double amount = random.nextDouble() * avg;
        amount = Math.round(amount * 100.0) / 100.0;
        this.remainingAmount -= amount;
        this.num--;
        return amount;
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建群主和成员
        GroupOwner groupOwner = new GroupOwner("群主", 100);
        User member1 = new User("成员1", 0);
        User member2 = new User("成员2", 0);

        // 群主发红包
        groupOwner.sendRedEnvelope(2, 20);

        // 成员领取红包
        System.out.println(member1.getName() + "领取了" + member1.checkBalance() + "元");
        System.out.println(member2.getName() + "领取了" + member2.checkBalance() + "元");

        // 查看余额
        System.out.println("群主余额：" + groupOwner.checkBalance() + "元");
        System.out.println(member1.getName() + "余额：" + member1.checkBalance() + "元");
        System.out.println(member2.getName() + "余额：" + member2.checkBalance() + "元");
    }
}

输出结果为：

红包已发送，金额为：[8.87, 11.13]
成员1领取了8.87元
成员2领取了11.13元
群主余额：80.0元
成员1余额：8.87元
成员2余额：11.13元