Here you can find the source of convertToString(final Collection> objects)
public static String convertToString(final Collection<?> objects)
//package com.java2s; /*//from ww w. j a va2s. c om * Copyright (c) 2015 Kumar Rohit * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License or 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Collection; public class Main { public static String convertToString(final Collection<?> objects) { String str = "["; boolean isNotFirst = false; for (Object object : objects) { if (isNotFirst) { str += ", "; } str += object; isNotFirst = true; } str += "]"; return str; } }