Pub-Sub envelope subscriber in Java

import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Context;
import org.zeromq.ZMQ.Socket;

/**
* Pubsub envelope subscriber
*/

public class psenvsub {

public static void main (String[] args) {

// Prepare our context and subscriber
Context context = ZMQ.context(1);
Socket subscriber = context.socket(ZMQ.SUB);

subscriber.connect("tcp://localhost:5563");
subscriber.subscribe("B".getBytes());
while (!Thread.currentThread ().isInterrupted ()) {
// Read envelope with address
String address = subscriber.recvStr ();
// Read message contents
String contents = subscriber.recvStr ();
System.out.println(address + " : " + contents);
}
subscriber.close ();
context.term ();
}
}