Here you can find the source of shuffle(List list, Random rnd)
public static void shuffle(List<?> list, Random rnd)
//package com.java2s; /**/*from ww w . j a v a 2s. c o m*/ * eAdventure (formerly <e-Adventure> and <e-Game>) is a research project of the * <e-UCM> research group. * * Copyright 2005-2010 <e-UCM> research group. * * You can access a list of all the contributors to eAdventure at: * http://e-adventure.e-ucm.es/contributors * * <e-UCM> is a research group of the Department of Software Engineering * and Artificial Intelligence at the Complutense University of Madrid * (School of Computer Science). * * C Profesor Jose Garcia Santesmases sn, * 28040 Madrid (Madrid), Spain. * * For more info please visit: <http://e-adventure.e-ucm.es> or * <http://www.e-ucm.es> * * **************************************************************************** * * This file is part of eAdventure, version 2.0 * * eAdventure is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * eAdventure is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with eAdventure. If not, see <http://www.gnu.org/licenses/>. */ import java.util.*; public class Main { public static void shuffle(List<?> list, Random rnd) { if (list instanceof RandomAccess) { int size = list.size(); for (int i = size; i > 1; i--) Collections.swap(list, i - 1, rnd.nextInt(i)); } } }