Here you can find the source of toCSV(Set
public static String toCSV(Set<String> list)
//package com.java2s; /**/*from w w w. j a v a 2 s . co m*/ * Vosao CMS. Simple CMS for Google App Engine. * * Copyright (C) 2009-2010 Vosao development team. * * 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. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * email: vosao.dev@gmail.com */ import java.util.Collection; import java.util.List; import java.util.Set; public class Main { public static String toCSV(Set<String> list) { return _toCSV(list); } public static String toCSV(List<String> list) { return _toCSV(list); } private static String _toCSV(Collection<String> list) { StringBuffer result = new StringBuffer(); int count = 0; for (String item : list) { result.append((count == 0 ? "" : ",")).append(item); count++; } return result.toString(); } }