Here you can find the source of sort(List list)
private static void sort(List list)
//package com.java2s; /*/*from w ww . j ava 2 s .c o m*/ * Help.java * * Copyright (C) 1998-2005 Peter Graves * $Id: Help.java,v 1.17 2005/03/06 04:43:54 piso Exp $ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ import java.util.Comparator; import java.util.Collections; import java.util.List; public class Main { private static Comparator comparator; private static void sort(List list) { if (comparator == null) { comparator = new Comparator() { public int compare(Object o1, Object o2) { return o1.toString().compareToIgnoreCase(o2.toString()); } }; } Collections.sort(list, comparator); } }