WebCrawler problem

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:

Code:

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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)
        {
        }
    }

       
}

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