Parallel task sink in Java

package guide;

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

//
// Task sink in Java
// Binds PULL socket to tcp://localhost:5558
// Collects results from workers via that socket
//

public class tasksink
{
public static void main(String[] args) throws Exception
{
// Prepare our context and socket
try (ZContext context = new ZContext()) {
ZMQ.Socket receiver = context.createSocket(SocketType.PULL);
receiver.bind("tcp://*:5558");

// Wait for start of batch
String string = new String(receiver.recv(0), ZMQ.CHARSET);

// Start our clock now
long tstart = System.currentTimeMillis();

// Process 100 confirmations
int task_nbr;
int total_msec = 0; // Total calculated cost in msecs
for (task_nbr = 0; task_nbr < 100; task_nbr++) {
string = new String(receiver.recv(0), ZMQ.CHARSET).trim();
if ((task_nbr / 10) * 10 == task_nbr) {
System.out.print(":");
}
else {
System.out.print(".");
}
}

// Calculate and report duration of batch
long tend = System.currentTimeMillis();

System.out.println(
"\nTotal elapsed time: " + (tend - tstart) + " msec"
);
}
}
}