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Datagram Receiver

import java.io.IOException; import javax.microedition.io.Connector; import javax.microedition.io.Datagram; import javax.microedition.io.DatagramConnection; public class DatagramReceiver {     public static void main(String[] args) {         if (args.length != 1) {             System.out.println("Usage: DatagramReceiver port");             System.exit(1);         }                  try {             DatagramConnection receiver =                      (DatagramConnection)Connector.open("datagram://:" + args[0]);             byte[] buffer = new byte[256];             Datagram dgram = receiver.newDatagram(buffer, buffer.length);             for (;;) {                 dgram.setLength(buffer.length);                 receiver.receive(dgram);                 int length = dgram.getLength();                 System.out.println("Datagram received. Length is " + length);                 // Show the content of the datagram.                 for (int i = 0; i < length; i++) {                     System.out.print(buffer[i] + " ");                 }                 System.out.println();                                  // Send it back...                 receiver.send(dgram);             }         } catch (IOException ex) {             System.out.println("IOException: " + ex);         }     } }