JAVA实现红包分发的示例代码

import java.util.Arrays;

import java.util.Random;

import java.math.*;

import java.util.Scanner;

public class Main {

  public static long now_time;

  public static long seed;

  public static int [] get_red_packets( int money, int num) {

   Random random = new Random(seed);

   seed = random.nextLong();

   int [] res = new int [num];

   double [] temp= new double [num];

   double sum = 0 ;

   int sum2 = 0 ;

   for ( int i = 0 ; i < num; i++) {

    temp[i] = random.nextDouble();

    sum += temp[i];

   }

   for ( int i = 0 ; i < num; i++) {

    res[i] = 1 + ( int )(temp[i] / sum * (money-num));

    sum2 += res[i]- 1 ;

   }

   res[random.nextInt(num)]+=money-sum2-num;

   return res;

  }

  public static void show( int [] red_packet){

   System.out.println( "红包 : " + Arrays.toString(red_packet));

  }

  public static void main(String[] args) {

   int num, money;

   Scanner scanner = new Scanner(System.in);

   now_time = System.currentTimeMillis();

   Random init_random = new Random(now_time);

   seed = init_random.nextLong();

   System.out.println( "请输入要分发的红包数量:" );

   num = scanner.nextInt();

   System.out.println( "请输入要分发的红包总金额(分):" );

   money = scanner.nextInt();

   int a[] = get_red_packets(money,num);

   show(a);

  }

}