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| package com.vci.client.fm.util;
|
| import java.util.Set;
| import java.util.TreeSet;
| /***
| * 随机算法工具类
| * @author liwei
| *
| */
| public class RandomUtil {
| /**
| * 在指定范围内随机选取n个随机数
| * @author liwei
| * @param num
| * @param n
| * @return
| */
| public static Set<Integer> getRandom(int num, int n) {
| Set<Integer> hs = new TreeSet<Integer>();
| while (true) {
| hs.add((int) (Math.random() * (num) + 1));
| if (hs.size() >= n) {
| break;
| }
| }
| return hs;
| }
| }
|
|