Here you can find the source of isCollection(Class> clazz)
public static boolean isCollection(Class<?> clazz)
//package com.java2s; /**/*from w ww . j a v a 2 s . c o m*/ * Copyright (c) 2012 - Reinaldo de Carvalho <reinaldoc@gmail.com> * * 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. * */ import java.util.Collection; public class Main { public static boolean isCollection(Class<?> clazz) { for (Class<?> claz : clazz.getInterfaces()) if (claz == Collection.class) return true; return false; } }