hi friend,

import java.net.*;
import java.io.*;

public class URLExample {
public static void main(String args[]){
try{
InetAddress local= InetAddress.getLocalHost();
System.out.println ("Local hostname is: " + local.getHostName());
}
catch (UnknownHostException e){
System.err.println ("Can't detect localhost : " + e);
}
}
}


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Read for more information,

http://www.roseindia.net/java/network/index.shtml

Thanks.