import java.net.*;import java.io.*;import java.util.*;/** * This example illustrates the basic method calls for connectionless * datagram socket. * @author M. L. Liu */public class Example1Sender {// An application which sends a message using connectionless// datagram socket.// Two command line arguments are expected, in order: // <domain name or IP address of the receiver>// <port number of the receiver's socket> public static void main(String[] args) { if (args.length != 2) System.out.println ("This program requires three command line arguments"); else { try { Scanner sc = new Scanner(System.in); InetAddress receiverHost = InetAddress.getByName(args[0]); int receiverPort = Integer.parseInt(args[1]); System.out.println("Please enter messages to send."); String message = sc.nextLine(); DatagramSocket mySocket = new DatagramSocket(); while(!message.equals("bye")) { // instantiates a datagram socket for sending the data byte[ ] buffer = message.getBytes( ); DatagramPacket datagram = new DatagramPacket(buffer, buffer.length, receiverHost, receiverPort); mySocket.send(datagram); message = sc.nextLine(); } byte [] buffer = message.getBytes(); DatagramPacket datagram = new DatagramPacket(buffer, buffer.length, receiverHost, receiverPort); mySocket.send(datagram); mySocket.close( ); } // end try catch (Exception ex) { ex.printStackTrace( ); } } // end else } // end main} // end class