Here you can find the source of join(Iterable items, String delimiter)
public static String join(Iterable<?> items, String delimiter)
//package com.java2s; /******************************************************************************* * Copyright 2011 Google Inc. All Rights Reserved. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * 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./* w w w . j av a 2 s .c o m*/ *******************************************************************************/ import java.util.Arrays; import java.util.Iterator; public class Main { public static String join(Iterable<?> items, String delimiter) { StringBuffer buffer = new StringBuffer(); Iterator<?> iter = items.iterator(); if (iter.hasNext()) { buffer.append(iter.next().toString()); while (iter.hasNext()) { buffer.append(delimiter); buffer.append(iter.next().toString()); } } return buffer.toString(); } public static String join(Object[] items, String delimiter) { return join(Arrays.asList(items), delimiter); } }