Pathologic Subscriber in Java

package guide;

import java.util.Random;

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

// Pathological subscriber
// Subscribes to one random topic and prints received messages

public class pathosub
{
public static void main(String[] args)
{
try (ZContext context = new ZContext()) {
Socket subscriber = context.createSocket(SocketType.SUB);
if (args.length == 1)
subscriber.connect(args[0]);
else subscriber.connect("tcp://localhost:5556");

Random rand = new Random(System.currentTimeMillis());
String subscription = String.format("%03d", rand.nextInt(1000));
subscriber.subscribe(subscription.getBytes(ZMQ.CHARSET));

while (true) {
String topic = subscriber.recvStr();
if (topic == null)
break;
String data = subscriber.recvStr();
assert (topic.equals(subscription));
System.out.println(data);
}
}
}
}