JAVA多线程抢红包的实现示例

大体思路

红包的分发见JAVA作业——红包分发。
而抢红包要解决的是线程问题。
其实比较简单，设定好人数，每个人一个线程，每个线程执行一遍，有红包就抢，没有红包就抢不到，所以run函数中只要判断现在还有没有红包就可以了。

代码实现

import java.util.Random;
import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    int person_num, red_pocket_num, sum_money;
    Scanner scanner = new Scanner(System.in);
    System.out.println("请设置红包个数:");
    red_pocket_num = scanner.nextInt();
    System.out.println("请设置总金额数量(分):");
    sum_money = scanner.nextInt();
    if(sum_money < red_pocket_num) {
      System.out.println("钱不够，退出程序。");
      return;
    }
    System.out.println("请设置抢红包成员个数:");
    person_num = scanner.nextInt();
    myRunnable myrunnable = new myRunnable(sum_money,red_pocket_num);
    Thread []person = new Thread[person_num];
    for (int i = 0; i < person_num; i++) {
      person[i] = new Thread(myrunnable);
      person[i].setName("用户"+(i+1));
      person[i].start();
    }
  }
}
class myRunnable implements Runnable{
  private int []red_pocket;
  private int num;
  private int now_num;
  public myRunnable(int money, int num) {
    this.red_pocket = new Red_Pocket(money, num).get_red_packets();
    this.num = num;
    this.now_num = num;
  }
  @Override
  public void run() {
    if(this.num>0){
      System.out.println(Thread.currentThread().getName()+"抢到了红包 "+(this.num-this.now_num+1)+" : "+red_pocket[--this.now_num]+"分");
    }
    else{
      System.out.println(Thread.currentThread().getName()+"未抢到红包。");
    }
  }
}
class Red_Pocket{
  private long seed;
  private int money;
  private int num;
  public int[] get_red_packets() {
    if(this.money < this.num) return new int[0];
    Random random = new Random(this.seed);
    this.seed = random.nextLong();
    int[] res = new int[this.num];
    double[] temp = new double[this.num];
    double sum = 0;
    int sum2 = 0;
    for (int i = 0; i < this.num; i++) {
      temp[i] = random.nextDouble();
      sum += temp[i];
    }
    for (int i = 0; i < this.num; i++) {
      res[i] = 1 + (int)(temp[i] / sum * (this.money - this.num));
      sum2 += res[i];
    }
    res[random.nextInt(this.num)] += this.money - sum2;
    return res;
  }
  private void init() {
    this.seed = new Random(System.currentTimeMillis()).nextLong();
  }
  public Red_Pocket(int money,int num) {
    init();
    this.money = money;
    this.num = num;
  }
}

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