Here you can find the source of shuffle(List> list)
public static void shuffle(List<?> list)
//package com.java2s; /*/*from ww w . j ava2 s. c o m*/ * Commons-Utils * Copyright (c) 2017. * * Licensed under the Apache License, Version 2.0 (the "License") */ import java.util.*; public class Main { public static void shuffle(List<?> list) { Collections.shuffle(list); } }