I have a number of traceroutes that i need to compare against each other but i dont know the best way to do it, ive been told that hash maps are a good technique but i dont know how to implement them on my code.

so far i have:

FileInputStream fstream = new FileInputStream("traceroute.log");

        // Get the object of DataInputStream

        DataInputStream in = new DataInputStream(fstream);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));

        String strLine;


        // reads lines in
        while ((strLine = br.readLine()) != null) {

            System.out.println(strLine);

        }

and the output looks like this:

Wed Mar 31 01:00:03 BST 2010

traceroute to www.bbc.co.uk (212.58.251.195), 30 hops max, 40 byte packets

1 139.222.0.1 (139.222.0.1) 0.873 ms 1.074 ms 1.162 ms

2 core-from-cmp.uea.ac.uk (10.0.0.1) 0.312 ms 0.350 ms 0.463 ms

3 ueaha1btm-from-uea1 (172.16.0.34) 0.791 ms 0.772 ms 1.238 ms

4 bound-from-ueahatop.uea.ac.uk (193.62.92.71) 5.094 ms 4.451 ms 4.441 ms

5 gi0-3.norw-rbr1.eastnet.ja.net (193.60.0.21) 4.426 ms 5.014 ms 4.389 ms

6 gi3-0-2.chel-rbr1.eastnet.ja.net (193.63.107.114) 6.055 ms 6.039 ms *

7 lond-sbr1.ja.net (146.97.40.45) 6.994 ms 7.493 ms 7.457 ms

8 so-6-0-0.lond-sbr4.ja.net (146.97.33.154) 8.206 ms 8.187 ms 8.234 ms

9 po1.lond-ban4.ja.net (146.97.35.110) 8.673 ms 6.294 ms 7.668 ms

10 bbc.lond-sbr4.ja.net (193.62.157.178) 6.303 ms 8.118 ms 8.107 ms

11 212.58.238.153 (212.58.238.153) 6.245 ms 8.066 ms 6.541 ms

12 212.58.239.62 (212.58.239.62) 7.023 ms 8.419 ms 7.068 ms

what i need to do is compare this trace against another one just like it and look for the changes and time differences etc, then print a stats page.