这篇文章主要介绍了JAVA实现红包分发的示例代码,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧 大体思路
如果发总金额为 m的 n 个红包,先用一个长度为 n的临时数组 a 存放 n个随机双精度小数
,然后用 sum表示数组 a 的和,每个红包的金额
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);
}
}