Re: string to URL and URL to string

From:

=?ISO-8859-1?Q?Roger_Lindsj=F6?= <news.nospam@tilialacus.net>

Newsgroups:

comp.lang.java.help

Date:

Fri, 26 Sep 2008 20:09:27 +0200

Message-ID:

<gbj7ik$189e$1@blue.telenor.se>

Andrew Thompson wrote:

On Sep 1, 12:33 pm, bH <bherbs...@hotmail.com> wrote:

As an aside, why are you converting an URL back to
a String? If you want to later compare the addresses,
it is better to form them all into URLs.

Actually, I would recommend against ever using equals() in URL to
compare URLs.

With the following program:

public class UrlEquals {

     static final String[] ADDRESSES = {
         "http://google.com",
         "http://ericsson.net",
         "http://google.com",
         "http://ericsson.com",
         "http://google.com",
     };

     public static void main(String...args) throws Exception {
         java.security.Security.setProperty("networkaddress.cache.ttl" ,
"0");
         Set<URL> set = new HashSet<URL>();
         for (String address: ADDRESSES) {
             set.add(new URL(address));
         }
         for (URL url: set) {
             System.out.println(url);
         }
     }
}

I can get the following results (depending on my network status).

1. http://google.com, http://ericsson.net
2. http://google.com, http://ericsson.net, http://google.com,
http://google.com
3. http://google.com, http://ericsson.net, http://ericsson.com
4. The program "hangs".

--
Roger Lindsj?