Here you can find the source of join(Iterable s, String delimiter)
protected static String join(Iterable<? extends CharSequence> s, String delimiter)
//package com.java2s; /*/*from w w w. j a va 2 s .c om*/ * Copyright 2009-2010 WSO2, Inc. (http://wso2.com) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Iterator; public class Main { protected static String join(Iterable<? extends CharSequence> s, String delimiter) { @SuppressWarnings("unchecked") Iterator<String> iter = (Iterator<String>) s.iterator(); StringBuffer buffer = new StringBuffer(iter.next()); while (iter.hasNext()) buffer.append(delimiter).append(iter.next()); return buffer.toString(); } }