Here you can find the source of listToString(List
public static String listToString(List<String> list, String delimiter)
//package com.java2s; /*//from w ww.ja v a2 s . c om * Copyright (C) 2007-2012 Geometer Plus <contact@geometerplus.com> * * 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., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ import java.util.List; public class Main { /** * * @Description: * @Author Administrator * @Date 2013-5-2 */ public static String listToString(List<String> list, String delimiter) { if (list == null || list.isEmpty()) { return ""; } final StringBuilder builder = new StringBuilder(); boolean first = true; for (String s : list) { if (first) { first = false; } else { builder.append(delimiter); } builder.append(s); } return builder.toString(); } }