JAVA多线程抢红包的实现示例

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;

   }

}