Anyone know how to find available classes in a package?

Question

Anyone know how to find available classes in a package?
Given a String like "java.io" I would like to write a method to extract the available classes in this package. I can't seem to find a method for this anywhere in the docs. The package class does not seem to have a method like this.

Answer 1

Here is some code I tried.
I'm not very familiar with manipulating JARs The code below is what I tried, but how do I access the packages like "java.io" in the JarFile? and then get the available classes?
import java.io.*;
import java.util.*;
import java.util.jar.*;
class Tester
     public static void main(String args[])
          try {
               JarFile jf = new JarFile("c:/jdk1.3/lib/dt.jar");/* usually rt.jar (and 1.4)*/
               Enumeration e = jf.entries();
                    while (e.hasMoreElements())
                         Object current = e.nextElement();
                         System.out.println(current.toString() + "class:"+current.getClass());
                         try {
                              Thread.sleep(300);
                         } catch (InterruptedException ie) {}
          } catch (IOException ioe) {System.out.println(ioe.toString());}
               /*also tried      ClassLoader cl = ClassLoader.getSystemClassLoader();
          try {
               Enumeration e = cl.getResources("c:/jdk1.3/lib/dt.jar");
               System.out.println(e.nextElement());
               while (e.hasMoreElements())
               System.out.println(e.nextElement());
          } catch (IOException ioe) {System.out.println(ioe.toString());}