Here you can find the source of join(final Iterable extends String> iterable, final String separator)
static String join(final Iterable<? extends String> iterable, final String separator)
//package com.java2s; /*//from ww w.j a v a2 s . c o m * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved. * * Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common * Development and Distribution License("CDDL") (collectively, the * "License"). You may not use this file except in compliance with the * License. You can obtain a copy of the License at * http://www.netbeans.org/cddl-gplv2.html * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the * specific language governing permissions and limitations under the * License. When distributing the software, include this License Header * Notice in each file and include the License file at * nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the GPL Version 2 section of the License file that * accompanied this code. If applicable, add the following below the * License Header, with the fields enclosed by brackets [] replaced by * your own identifying information: * "Portions Copyrighted [year] [name of copyright owner]" * * Contributor(s): * * Portions Copyrighted 2008 Sun Microsystems, Inc. */ import java.util.Arrays; import java.util.Iterator; public class Main { static String join(final String[] arr, final String separator) { return join(Arrays.asList(arr), separator); } static String join(final Iterable<? extends String> iterable, final String separator) { return join(iterable, separator, separator); } static String join(final Iterable<? extends String> iterable, final String separator, final String lastSeparator) { Iterator<? extends String> it = iterable.iterator(); if (!it.hasNext()) { return ""; } StringBuffer buf = new StringBuffer(60); buf.append(it.next()); while (it.hasNext()) { String next = it.next(); if (it.hasNext()) { buf.append(separator); } else { buf.append(lastSeparator); } buf.append(next); } return buf.toString(); } }