socket programming

[phpuser123]

I just started socket programming in java.I read a few tutorial and came up with the following script

import java.net.*;

public class socket {

/**
* @param args
*/
public static void main(String[] args) throws Exception {
String sentence;String modifiedSentence;




Socket clientSocket = new Socket("hostname", 8123);
System.out.println(clientSocket.getPort());
}

}


Now,when I run the codes i get the following exceptiions

Exception in thread "main" java.net.UnknownHostException: hostname
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at socket.main(socket.java:15)

I hava no idea what it is exactly and the pproblem with the codes here..I will be really obliged to those who can enlighten me a bit

Thanks in adv ...

[chaarmann]

which IP-Address is assignet to "hostname" on your system?
You can look that up in .../etc/hosts file.
Or with "ping hostname".

I guess you haven't assigned any IP-address to the name of the host there.
So the command "new Socket("hostname", 8123); " won't run.
Instead of String "hostname", try to give its ip-address here. Maybe the DNS-server doesn't work.
But first, try to ping with this IP-address. If you can't ping, you (most likely) can't connect to this server over sockets. You have to check with the network people then why your access to this server is blocked.