WebCrawler problem

[System_Error]

I've been working on this webcrawler and I've ran into a problem. I can read the first URL and get all the URLs out of the HTML code, but I can't seem to set up a looping structure that will work.

This is basically what it does:

Searches through html of first URL.
It may find, say 20 other URLs contained in that one.
stops.


How can I make it to were it would continously search through the ones that were found?

Here is the code I have so far, but it's not complete:

import java.io.*;
import java.net.*;
import java.util.*;

public class CustomWebCrawler implements Runnable
{
    ArrayList alCurrentSearches = new ArrayList();
    ArrayList alAlreadySearched = new ArrayList();
    ArrayList alMatchingSearches = new ArrayList();
    Thread running;
    URL enteredURL;
    int count = 0;
    
    public CustomWebCrawler()
    {
	    
    }
    
    public void start()
    {

        if (running == null)
        {
            running = new Thread();
        }
    }
    
    public void stop()
    {

        if (running != null)
        {
            running = null;

        }
    }
    
    public void run()
    {
        if (enteredURL == null || enteredURL.getProtocol().compareTo("http") != 0)
        {
            running = null;
        }
	alCurrentSearches.add(enteredURL);
	
          BufferedReader br = null;
        try
        {
           br = new BufferedReader(new InputStreamReader(enteredURL.openStream()));
           String inputText = "";
           while ((inputText = br.readLine()) != null)
          {
                int first = inputText.lastIndexOf("<a href=");
                int end = inputText.indexOf("\">",first);
                if (first != -1 && end != -1)
                {
                    findURL(inputText,first,end);
                }
                else
                {
                }
                
            }
          }

        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
    
    public void findURL(String text, int numFirst, int numEnd)
    {
        String link = text.substring(numFirst+9, numEnd);
	try
	{
		URL newURL = new URL(link);
		if (newURL.getProtocol().compareTo("http") == 0)
		{
			if (!(alMatchingSearches.contains(newURL)))
			{
				alAlreadySearched.add(newURL);
				alMatchingSearches.add(newURL);
				System.out.println(newURL + "");
			}
		}
	}
	catch(MalformedURLException mue)
	{
	}
    }

	
}