Java DatagramSocket UDP Multiple Cast Sender

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class Main {
  public static void main(String[] args) {
    int mcPort = 12345;
    String mcIPStr = "230.1.1.1";
    DatagramSocket udpSocket = null;

    try {//from  ww  w  .  j av a2s. c o m
      // Create a data gram socket
      udpSocket = new DatagramSocket();

      // Prepare a message
      InetAddress mcIPAddress = InetAddress.getByName(mcIPStr);

      byte[] msg = "Hello multicast socket".getBytes();
      DatagramPacket packet = new DatagramPacket(msg, msg.length);
      packet.setAddress(mcIPAddress);
      packet.setPort(mcPort);
      udpSocket.send(packet);

      System.out.println("Sent a multicast message.");
      System.out.println("Exiting application");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if (udpSocket != null) {
        try {
          udpSocket.close();
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    }
  }
}