Here you can find the source of concatRefs(List
public static String concatRefs(List<String> refs)
//package com.java2s; /*//from ww w.j a va 2s .com * Copyright 2010, Red Hat, Inc. and individual contributors as indicated by the * @author tags. See the copyright.txt file in the distribution for a full * listing of individual contributors. * * This 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 software 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 software; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF * site: http://www.fsf.org. */ import java.util.Iterator; import java.util.List; public class Main { public static String concatRefs(List<String> refs) { return concat(refs, ' '); } private static String concat(List<String> strings, char c) { StringBuilder sb = new StringBuilder(); for (Iterator<String> it = strings.iterator(); it.hasNext();) { String s = it.next(); sb.append(s); if (it.hasNext()) sb.append(c); } return sb.toString(); } }