JAVA多線程搶紅包的實現示例

大體思路

紅包的分發見JAVA作業——紅包分發。
而搶紅包要解決的是線程問題。
其實比較簡單,設定好人數,每個人一個線程,每個線程執行一遍,有紅包就搶,沒有紅包就搶不到,所以run函數中隻要判斷現在還有沒有紅包就可以瞭。

代碼實現

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("請設置紅包個數:");
    red_pocket_num = scanner.nextInt();
    System.out.println("請設置總金額數量(分):");
    sum_money = scanner.nextInt();
    if(sum_money < red_pocket_num) {
      System.out.println("錢不夠,退出程序。");
      return;
    }
    System.out.println("請設置搶紅包成員個數:");
    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("用戶"+(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()+"搶到瞭紅包 "+(this.num-this.now_num+1)+" : "+red_pocket[--this.now_num]+"分");
    }
    else{
      System.out.println(Thread.currentThread().getName()+"未搶到紅包。");
    }
  }
}
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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