Here you can find the source of reverse(Collection
public static <T> List<T> reverse(Collection<T> list)
//package com.java2s; /*-------------------------------------------------------------------------+ | | | Copyright 2005-2011 The ConQAT Project | | | | 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.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.List; public class Main { /**//from www .j av a 2 s .c om * Returns a list that contains the elements of the specified list in * reversed order. * <p> * This method does not modify the original collection. */ public static <T> List<T> reverse(Collection<T> list) { ArrayList<T> reversed = new ArrayList<T>(list); Collections.reverse(reversed); return reversed; } }