使用Java基于ArrayList實(shí)現(xiàn)一個(gè)群主發(fā)紅包功能

package day05_after03;

/**
 * 定義成員類
 *
 * @author liuwenlong
 * @create 2020-07-14 18:08:25
 */
@SuppressWarnings("all")
public class Human {
  private String name;
  private int age;
  private int wallet;

  public Human() {
  }

  public int getWallet() {
    return wallet;
  }

  public void setWallet(int wallet) {
    this.wallet = wallet;
  }

  public Human(String name, int age) {
    this.name = name;
    this.age = age;
  }

  public String getName() {
    return name;
  }

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

  public int getAge() {
    return age;
  }

  public void setAge(int age) {
    this.age = age;
  }

  public String showInfo() {
    return getName() + ", 余額：" + getWallet();
  }
}

/**
   * 群主發(fā)紅包
   *
   * @param amount int 紅包大小
   * @param count int 紅包個(gè)數(shù)
   * @return 返回拆分好的紅包數(shù)組
   */
  public ArrayList<Integer> hangOut(int amount, int count) {
    ArrayList<Integer> RedPackage = new ArrayList<>();//創(chuàng)建一個(gè)數(shù)列，存放N份紅包
    if (!(this.getWallet() < amount)) {
      int whole = amount / count;//整的錢
      int surplus = amount % count;//余下的錢
      for (int i = 0; i < count - 1; i++) {
        RedPackage.add(whole);
      }
      RedPackage.add((whole + surplus));//余下的加到最后一個(gè)上面
      int getMoney = getWallet();
      setWallet(getMoney - amount);//修改群主的錢包
    } else {
      System.out.println("余額不足！");
      return null;
    }
    return RedPackage;
  }

/**
   * 群成員拆紅包
   *
   * @param redPack 群主打包好的紅包數(shù)組，隨機(jī)抽取一個(gè)
   */
  public void receive(ArrayList<Integer> redPack) {
    int index = (int) (Math.random() * redPack.size());//從0到當(dāng)前值取隨機(jī)數(shù)，當(dāng)前值遞減
    int numberRedPack = redPack.get(index);//根據(jù)下標(biāo)獲取金額
    int selfAcount = getWallet();//獲取自己之前的金額
    setWallet((selfAcount + numberRedPack));//重新設(shè)置錢包
    redPack.remove(index);//將紅包數(shù)組內(nèi)的這個(gè)紅包刪除，個(gè)數(shù)減少
  }

/**
 * 群主發(fā)紅包
 *
 * @author liuwenlong
 * @create 2020-07-14 18:35:04
 */
@SuppressWarnings("all")
public class TestRedPack {
  public static void main(String[] args) {
    ArrayList<Integer> red = new ArrayList<>();
    Manage manage = new Manage("管理員", 20, 100);
    Member m1 = new Member("張三", 18, 0);
    Member m2 = new Member("李四", 17, 0);
    Member m3 = new Member("王五", 16, 0);

    System.out.println(manage.showInfo());
    System.out.println(m1.showInfo());
    System.out.println(m2.showInfo());
    System.out.println(m3.showInfo());

    System.out.println("=====================================================");
    red = manage.hangOut(20, 3);//群主發(fā)紅包
    m1.receive(red);
    m2.receive(red);
    m3.receive(red);

    System.out.println(manage.showInfo());
    System.out.println(m1.showInfo());
    System.out.println(m2.showInfo());
    System.out.println(m3.showInfo());

  }
}