Java API Tutorial - Java MulticastSocket .joinGroup (InetAddress mcastaddr)

Syntax

MulticastSocket.joinGroup(InetAddress mcastaddr) has the following syntax.

public void joinGroup(InetAddress mcastaddr)  throws IOException

Example

In the following code shows how to use MulticastSocket.joinGroup(InetAddress mcastaddr) method.

import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
//  ww w  .j a  va 2s  .c o  m
public class Main {

  public static void main(String[] args) throws Exception {

    int port = 0;
    byte ttl = (byte) 1;

    InetAddress ia = InetAddress.getByName("127.0.0.1");

    byte[] data = "Here's some multicast data\r\n".getBytes();
    DatagramPacket dp = new DatagramPacket(data, data.length, ia, port);

    MulticastSocket ms = new MulticastSocket();
    ms.joinGroup(ia);
    for (int i = 1; i < 10; i++) {
      ms.send(dp, ttl);
    }
    ms.leaveGroup(ia);
    ms.close();
  }

}