MyJavaP.java Source code

Introduction

Here is the source code for MyJavaP.java

Source

/*
 * 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.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * JavaP prints structural information about classes. For each class, all public
 * fields and methods are listed. The "Reflection" API is used to look up the
 * information.
 * 
 * @version $Id: MyJavaP.java,v 1.6 2004/03/14 17:45:51 ian Exp $
 */
public class MyJavaP {

    /**
     * Simple main program, construct self, process each class name found in
     * argv.
     */
    public static void main(String[] argv) {
        MyJavaP pp = new MyJavaP();

        if (argv.length == 0) {
            System.err.println("Usage: MyJavaP className [...]");
            System.exit(1);
        } else
            for (int i = 0; i < argv.length; i++)
                pp.doClass(argv[i]);
    }

    /**
     * Format the fields and methods of one class, given its name.
     */
    protected void doClass(String className) {

        try {
            Class c = Class.forName(className);
            System.out.println(Modifier.toString(c.getModifiers()) + ' ' + c + " {");

            int mods;
            Field fields[] = c.getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                if (!Modifier.isPrivate(fields[i].getModifiers())
                        && !Modifier.isProtected(fields[i].getModifiers()))
                    System.out.println("\t" + fields[i]);
            }
            Constructor[] constructors = c.getConstructors();
            for (int j = 0; j < constructors.length; j++) {
                Constructor constructor = constructors[j];
                System.out.println("\t" + constructor);

            }
            Method methods[] = c.getDeclaredMethods();
            for (int i = 0; i < methods.length; i++) {
                if (!Modifier.isPrivate(methods[i].getModifiers())
                        && !Modifier.isProtected(methods[i].getModifiers()))
                    System.out.println("\t" + methods[i]);
            }
            System.out.println("}");
        } catch (ClassNotFoundException e) {
            System.err.println("Error: Class " + className + " not found!");
        } catch (Exception e) {
            System.err.println(e);
        }
    }
}