Here you can find the source of assertInstanceOf(Object obj, Class> expClass)
public static void assertInstanceOf(Object obj, Class<?> expClass)
//package com.java2s; /**/* w w w . ja v a2 s . c o m*/ * <copyright> * * Copyright (c) 2005, 2006, 2007, 2008 Springsite BV (The Netherlands) and others * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Martin Taal - Initial API and implementation * * </copyright> * * $Id: AssertUtil.java,v 1.7 2009/03/30 07:53:04 mtaal Exp $ */ public class Main { /** * Checks if the passed object is of the class specified, null values are ignored */ public static void assertInstanceOf(Object obj, Class<?> expClass) { if (obj == null) return; if (!(expClass.isAssignableFrom(obj.getClass()))) { throw new AssertionError("Expected class: " + expClass.getName() + " but object has class: " + obj.getClass().getName()); } } }