ShowMethods.java Source code

Introduction

Here is the source code for ShowMethods.java

Source

// : c10:ShowMethods.java
// Using reflection to show all the methods of a class,
// even if the methods are defined in the base class.
// {Args: ShowMethods}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.regex.Pattern;

public class ShowMethods {
    private static final String usage = "usage: \n" + "ShowMethods qualified.class.name\n"
            + "To show all methods in class or: \n" + "ShowMethods qualified.class.name word\n"
            + "To search for methods involving 'word'";

    private static Pattern p = Pattern.compile("\\w+\\.");

    public static void main(String[] args) {
        if (args.length < 1) {
            System.out.println(usage);
            System.exit(0);
        }
        int lines = 0;
        try {
            Class c = Class.forName(args[0]);
            Method[] m = c.getMethods();
            Constructor[] ctor = c.getConstructors();
            if (args.length == 1) {
                for (int i = 0; i < m.length; i++)
                    System.out.println(p.matcher(m[i].toString()).replaceAll(""));
                for (int i = 0; i < ctor.length; i++)
                    System.out.println(p.matcher(ctor[i].toString()).replaceAll(""));
                lines = m.length + ctor.length;
            } else {
                for (int i = 0; i < m.length; i++)
                    if (m[i].toString().indexOf(args[1]) != -1) {
                        System.out.println(p.matcher(m[i].toString()).replaceAll(""));
                        lines++;
                    }
                for (int i = 0; i < ctor.length; i++)
                    if (ctor[i].toString().indexOf(args[1]) != -1) {
                        System.out.println(p.matcher(ctor[i].toString()).replaceAll(""));
                        lines++;
                    }
            }
        } catch (ClassNotFoundException e) {
            System.out.println("No such class: " + e);
        }
    }
} ///:~