/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.lang.reflect.Method;public class MethodTroubleToo {    public void ping() { System.out.format("PONG!%n"); }    public static void main(String... args) {	try {	    MethodTroubleToo mtt = new MethodTroubleToo();	    Method m = MethodTroubleToo.class.getMethod("ping"); 	    switch(Integer.parseInt(args[0])) {	    case 0:  		m.invoke(mtt);                 // works		break;	    case 1: 		m.invoke(mtt, null);           // works (expect compiler warning)		break;	    case 2:		Object arg2 = null;		m.invoke(mtt, arg2);           // IllegalArgumentException		break;	    case 3:		m.invoke(mtt, new Object[0]);  // works		break;	    case 4:		Object arg4 = new Object[0];		m.invoke(mtt, arg4);           // IllegalArgumentException		break;	    default:		System.out.format("Test not found%n");	    }        // production code should handle these exceptions more gracefully	} catch (Exception x) {	    x.printStackTrace();	}    }}