Here you can find the source of join(String str[], String splitter)
public static String join(String str[], String splitter)
//package com.java2s; /*//from ww w.j av a 2 s.co m * Copyright (C) 2014 (JenniferSoft Inc.) * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.util.ArrayList; public class Main { public static String join(String str[], String splitter) { StringBuilder b = new StringBuilder(); b.append(str[0]); for (int i = 1, len = str.length; i < len; i++) { b.append(splitter).append(str[i]); } return b.toString().trim(); } public static String join(ArrayList<String> result, String splitter) { StringBuilder b = new StringBuilder(); b.append(result.get(0)); for (int i = 1, len = result.size(); i < len; i++) { b.append(splitter).append(result.get(i)); } return b.toString().trim(); } }