Here you can find the source of shuffle(final A source, final Random random)
public static final <T, A extends List<? super T>> A shuffle(final A source, final Random random)
//package com.java2s; /*/*from ww w . j a v a 2 s. c o m*/ * Copyright (c) 2018, The Modern Way. All rights reserved. * * Licensed 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.Collections; import java.util.List; import java.util.Random; public class Main { public static final <T, A extends List<? super T>> A shuffle(final A source) { Collections.shuffle(source); return source; } public static final <T, A extends List<? super T>> A shuffle(final A source, final Random random) { Collections.shuffle(source, random); return source; } }