Here you can find the source of sort(List
public static <E> List<E> sort(List<E> list)
//package com.java2s; /**/* w w w . j a v a 2s.c o m*/ * Copyright (c) 2000-present Liferay, Inc. All rights reserved. * * This library 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 2.1 of the License, or (at your option) * any later version. * * This library 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. */ import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; public class Main { public static <E> List<E> sort(List<E> list) { return sort(list, null); } public static <E> List<E> sort(List<E> list, Comparator<? super E> comparator) { list = copy(list); Collections.sort(list, comparator); return list; } public static <E> List<E> copy(List<? extends E> master) { if (master == null) { return null; } return new ArrayList<>(master); } }