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);
  }
}