Here you can find the source of shuffle(int[] list, Random rnd)
public static void shuffle(int[] list, Random rnd)
//package com.java2s; /**//from w ww .j a v a 2 s . co m * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Random; public class Main { public static void shuffle(int[] list, Random rnd) { shuffle(list, list.length, rnd); } public static void shuffle(int[] list, int len, Random rnd) { for (int i = len; i > 1; i--) { swap(list, i - 1, rnd.nextInt(i)); } } public static void swap(int[] arr, int a, int b) { int t = arr[a]; arr[a] = arr[b]; arr[b] = t; } public static void swap(double[] arr, int a, int b) { double t = arr[a]; arr[a] = arr[b]; arr[b] = t; } }