Here you can find the source of toString(List
public static String toString(List<String> strings)
//package com.java2s; /**//www . ja va 2 s. c o m * DSS - Digital Signature Services * Copyright (C) 2015 European Commission, provided under the CEF programme * * This file is part of the "DSS - Digital Signature Services" project. * * 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 */ import java.util.List; public class Main { public static String toString(List<String> strings) { final String SEPARATOR = ","; final StringBuilder stringBuilder = new StringBuilder(); for (final String string : strings) { if (stringBuilder.length() != 0) { stringBuilder.append(SEPARATOR).append(' '); } stringBuilder.append(string); } return stringBuilder.toString(); } }