Here you can find the source of isACollection(Object input)
private static boolean isACollection(Object input)
//package com.java2s; /*// w w w .j a v a 2 s . c o m * Copyright (c) 2010-2015 Osman Shoukry * * 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 { private static boolean isACollection(Object input) { return input instanceof Collection; } }