Here you can find the source of getClassesOfType(T[] l, Class type)
public static <T, U> List<U> getClassesOfType(T[] l, Class<U> type)
//package com.java2s; /******************************************************************************* * The MIT License (MIT)/*from www . j a va2 s . co m*/ * Copyright (c) 2015 University of Twente * * 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.ArrayList; import java.util.List; public class Main { /** * Get the all classes of type U in the collection */ public static <T, U> List<U> getClassesOfType(T[] l, Class<U> type) { List<U> list = new ArrayList<U>(); for (T o : l) { if (type.isInstance(o)) { list.add(type.cast(o)); } } return list; } }