Pub-Sub envelope subscriber in Java

package guide;

import org.zeromq.SocketType;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Socket;
import org.zeromq.ZContext;

/**
* Pubsub envelope subscriber
*/

public class psenvsub
{

public static void main(String[] args)
{
// Prepare our context and subscriber
try (ZContext context = new ZContext()) {
Socket subscriber = context.createSocket(SocketType.SUB);
subscriber.connect("tcp://localhost:5563");
subscriber.subscribe("B".getBytes(ZMQ.CHARSET));

while (!Thread.currentThread().isInterrupted()) {
// Read envelope with address
String address = subscriber.recvStr();
// Read message contents
String contents = subscriber.recvStr();
System.out.println(address + " : " + contents);
}
}
}
}