Program that finds all servers on the net 76-lines

Question

Hi Guys and Birds,
Here's a small program written by the dear brothers Asger (hjerl.dk) and Morten (www.mycgiserver.com/~game) which finds all servers on the net in a couple of hours. Good luck
package com.hjerl;
import javax.swing.*;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.util.*;
public class Browser extends JFrame {
int counterwww = 0;
ArrayList visitedUrls = new ArrayList();
ArrayList links = new ArrayList();
public static void main(String[] args) {
     Browser b = new Browser();
public Browser() {
     fetchLinesInPageAsArrayList("www.jp.dk");
     System.out.println("Number of links found: " + counterwww);
private void fetchLinesInPageAsArrayList(String str) {
     ArrayList al = new ArrayList();
     try {
          URL url = new URL("http://"+str);
          URLConnection uc = url.openConnection();
          uc.connect();
          InputStream is = uc.getInputStream();
          BufferedReader br = new BufferedReader(new InputStreamReader(is));
          int c = 0;
          while (br.ready()) {
               al.add(br.readLine());
          findLinksFromLineArrayList(al);
     catch(Exception ex) {
          ex.printStackTrace();
private void findLinksFromLineArrayList(ArrayList al) {
     for (int c = 0; c < al.size(); c++) {
          String s = ((String) al.get(c)).toLowerCase();
          //int a = s.indexOf("http://");
          int b = s.indexOf("www.");
          int d = s.indexOf("/", b+4);
          if (b == -1 | d == -1)
               continue;
          String link = s.substring(b,d);
          //fjerner evt.""
          int e = link.indexOf("\"");
          if (e != -1) {
               link = link.substring(0, e);
          if (links.contains(link) == false)
               System.out.println("New link found: " + link);
               links.add(link);
               counterwww++;
               fetchLinesInPageAsArrayList(link);
          else
               System.out.println(" Old link found: " + link);
}

Answer 1

Well, apart from the "finds all servers" bit and the "in a couple of hours" bit, that sounds quite plausible...