Program to Display host name by IP address in Java

// Program to Display host name by IP address.
import java.net.*;
class HostName
{
public static void main( String args[ ] ) 
{
 // byte ad[ ] = { (byte)192, (byte)168, 1, 2 };
 
 try
 {
  // InetAddress ip = InetAddress.getByAddress( ad );
  InetAddress ip = InetAddress.getByAddress( new byte[ ] { (byte)192, (byte)168, 1, 2 } );
  System.out.println("  " + ip.getHostName());
 }
 catch( UnknownHostException ue )
 {
  System.out.println(" Can't find given host.");
 }  
}
}

Output:
nils