Here you can find the source of join(String[] strArray, String delimiter)
public static String join(String[] strArray, String delimiter)
//package com.java2s; /**// ww w . jav a 2 s . co m * Copyright (c) 2001-2002. Department of Family Medicine, McMaster University. All Rights Reserved. * This software is published under the GPL GNU General Public License. * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * This software was written for the * Department of Family Medicine * McMaster University * Hamilton * Ontario, Canada */ import java.util.List; public class Main { public static String join(String[] strArray, String delimiter) { StringBuilder result = new StringBuilder(); for (int i = 0, arrayLength = strArray.length; i < arrayLength; i++) { result.append(strArray[i]); if (i < arrayLength - 1) { result.append(delimiter); } } return result.toString(); } public static String join(List strArray, String delimiter) { StringBuilder result = new StringBuilder(); for (int i = 0, arrayLength = strArray.size(); i < arrayLength; i++) { result.append(strArray.get(i)); if (i < arrayLength - 1) { result.append(delimiter); } } return result.toString(); } }