Help with a program

So /prog/ I want to write a java program that searches the internet.  But i don't mean something gay like google i mean starts with http://a.com then http://b.com so on and so on searching every possibility including sub dirs and so on.

Where should I start

so far i have

import.java.util.*

for $a (1..254) {
for $b (1..254) {
  for $c (1..254) {
   for $d (1..254) {
Terrible!