Here you can find the source of containsSameType(Object o, Collection collection)
public static boolean containsSameType(Object o, Collection collection)
//package com.java2s; /*//from w w w.j a v a 2 s. c o m Strandz LGPL - an API that matches the user to the data. Copyright (C) 2007 Chris Murphy Strandz LGPL 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 2.1 of the License, or (at your option) any later version. This library 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 library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA The authors can be contacted via www.strandz.org */ import java.util.Collection; import java.util.Iterator; public class Main { public static boolean containsSameType(Object o, Collection collection) { boolean result = false; for (Iterator iterator = collection.iterator(); iterator.hasNext();) { Object o1 = iterator.next(); if (o1.getClass() == o.getClass()) { result = true; break; } } return result; } }