使用Collections.shuffle方法生成随机顺序的List

使用Collections.shuffle方法生成随机顺序的List，shuffle方法可以根据是否传入random实例决定list随机顺序的生成方式。

package com.teriste.web;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.*;

/**
 * 使用Collections.shuffle方法生成随机顺序的List
 */
@RunWith(SpringJUnit4ClassRunner.class)
public class RandomListTest {
    //随机数种子
    private long randomnessSeed = System.currentTimeMillis() ^ (long)this.hashCode();

    private Random sourceOfRandomness = new Random(randomnessSeed);

    @Test
    public void randList(){
        List originList= Arrays.asList("a","b","c","d","e");
        List<String> randList = shuffle(originList);
        System.out.println(randList);
    }

    /**
     * 随机打乱list中元素的顺序
     * @param originList
     * @return
     */
    private List<String> shuffle(Collection<String> originList) {
        List<String>