Here you can find the source of castInstance(Object o, Class
public static <T> T castInstance(Object o, Class<T> clazz)
//package com.java2s; /*/*from w w w .j a v a 2 s . co m*/ * ***************************************************************************** * Cloud Foundry * Copyright (c) [2009-2015] Pivotal Software, Inc. All Rights Reserved. * This product is licensed to you under the Apache License, Version 2.0 (the "License"). * You may not use this product except in compliance with the License. * * This product includes a number of subcomponents with * separate copyright notices and license terms. Your use of these * subcomponents is subject to the terms and conditions of the * subcomponent's license, as noted in the LICENSE file. * ***************************************************************************** */ public class Main { public static <T> T castInstance(Object o, Class<T> clazz) { try { return clazz.cast(o); } catch (ClassCastException e) { throw new IllegalArgumentException(e); } } }