public static void main(String[] args) {
int serverPort = 13; // default port
if (args.length == 1) serverPort = Integer.parseInt(args[0]);
try {
// instantiates a datagram socket for both sending
// and receiving data
MyServerDatagramSocket mySocket = new MyServerDatagramSocket(serverPort);
System.out.println("Daytime server ready.");
while (true) { // forever loop
DatagramMessage request = mySocket.receiveMessageAndSender();
System.out.println("Request received");
// The message received is unimportant; it is the sender's
// address that we need in order to reply.
// Now obtain the timestamp from the local system.
Date timestamp = new Date();
System.out.println("timestamp sent: " + timestamp.toString());
// Now send the reply to the requestor
mySocket.sendMessage(request.getAddress(), request.getPort(), timestamp.toString());
} // end while
} // end try
catch (Exception ex) {
System.out.println("There is a problem: " + ex);
} // end catch
} // end main
