Here you can find the source of toString(Collection elements, String separator)
public static String toString(Collection<?> elements, String separator)
//package com.java2s; /*//from www . j a va2 s .c o m * This file is part of JICI, licensed under the MIT License (MIT). * * Copyright (c) 2015-2016 Aleksi Sapon <http://sapon.ca/jici/> * * 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.Arrays; import java.util.Collection; import java.util.Iterator; public class Main { public static String toString(Object[] elements, String separator) { return toString(Arrays.asList(elements), separator); } public static String toString(Collection<?> elements, String separator) { final int size = elements.size() - 1; if (size >= 0) { final StringBuilder builder = new StringBuilder(); final Iterator<?> iterator = elements.iterator(); for (int i = 0; i < size; i++) { builder.append(iterator.next()); builder.append(separator); } return builder.append(iterator.next()).toString(); } return ""; } }