Mega Code Archive
Get a given method, and invoke it
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/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.lang.reflect.Method;
/**
* This class is just here to give us something to work on, with a println()
* call that will prove we got here.
*/
class X {
public void work(String s) {
System.out.println("Working on \"" + s + "\"");
}
}
/**
* Get a given method, and invoke it.
*
* @author Ian F. Darwin, http://www.darwinsys.com/
* @version $Id: GetMethod.java,v 1.3 2004/02/09 03:33:51 ian Exp $
*/
public class GetMethod {
public static void main(String[] argv) {
try {
Class clX = X.class; // or Class.forName("X");
// To find a method we need the array of matching Class types.
Class[] argTypes = { String.class };
// Now find a Method object for the given method.
Method worker = clX.getMethod("work", argTypes);
// To INVOKE the method, we need its actual arguments, as an array.
Object[] theData = { "Chocolate Chips" };
// The obvious last step: invoke the method.
worker.invoke(new X(), theData);
} catch (Exception e) {
System.err.println("Invoke() failed: " + e);
}
}
}
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