Here you can find the source of listToString(List
public static <T> String listToString(List<T> elements)
//package com.java2s; /**//from w ww .jav a2s. c om * The Land of Alembrum * Copyright (C) 2006-2013 Evariste Boussaton * * * 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 3 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, see <http://www.gnu.org/licenses/>. * */ import java.util.List; public class Main { public static <T> String listToString(List<T> elements) { StringBuilder sb = new StringBuilder(16); for (T elem : elements) { sb.append(elem.toString()); sb.append(","); } if (sb.length() > 1) { sb.setLength(sb.length() - 1); } return sb.toString(); } }