I am new to multithreading & socket programming in Java. I would like to know what is the best way to implement 2 threads - one for receiving a socket and one for sending a socket. If what I am trying to do sounds absurd, pls let me know why! The code is largely inspired from Sun's tutorials online.I want to use Multicast sockets so that I can work with a multicast group.

class server extends Thread
{

static protected MulticastSocket socket = null;
protected BufferedReader in = null;
public InetAddress group;

private static class receive implements Runnable
{

public void run()
{
try
{
byte[] buf = new byte[256];
DatagramPacket pkt = new DatagramPacket(buf,buf.length);
socket.receive(pkt);
String received = new String(pkt.getData(),0,pkt.getLength());
System.out.println("From server@" + received);          
Thread.sleep(1000);
}
catch (IOException e)
        { System.out.println("Error:"+e);
        }   
catch (InterruptedException e)
{ System.out.println("Error:"+e);
}   

}

}


public server() throws IOException
{
super("server");
socket = new MulticastSocket(4446);
group = InetAddress.getByName("239.231.12.3");
socket.joinGroup(group);
}

public void run()
{

    while(1>0)
    {   
        try
        {
        byte[] buf = new byte[256];
        DatagramPacket pkt = new DatagramPacket(buf,buf.length);        
        //String msg = reader.readLine();
        String pid = ManagementFactory.getRuntimeMXBean().getName();
        buf = pid.getBytes();
        pkt = new DatagramPacket(buf,buf.length,group,4446);
        socket.send(pkt);
        Thread t = new Thread(new receive());
        t.start();

        while(t.isAlive())
        { t.join(1000);
        }
        sleep(1);
        }
        catch (IOException e)
        { System.out.println("Error:"+e);
        }   
        catch (InterruptedException e)
        { System.out.println("Error:"+e);
        }   

    }
    //socket.close();
}
public static void main(String[] args) throws IOException
{
new server().start();
//System.out.println("Hello");
}

}