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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