Java 8 Elapsed time with Guava

ElapsedTime.java

import com.google.common.base.Stopwatch;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.time.Duration;
import javax.swing.Timer;

/**
 *
 * @author Rodrigo
 */
public class ElapsedTime {

    static Stopwatch stopwatch;

    public static void main(String[] args) throws Exception {
        stopwatch = Stopwatch.createStarted();
        Timer timer = new Timer(10, new hour());
        timer.start();
        
        Thread.sleep(100);
    }

    private static String formatDuration(Duration d) {
        long days = d.toDays();
        d = d.minusDays(days);
        long hours = d.toHours();
        d = d.minusHours(hours);
        long minutes = d.toMinutes();
        d = d.minusMinutes(minutes);
        long seconds = d.getSeconds();
        return String.format("%02d", hours)
                + ":" + String.format("%02d", minutes)
                + ":" + String.format("%02d", seconds);
    }

    public static class hour implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            Duration duration = stopwatch.elapsed();
            System.out.println("Elapsed time - " + formatDuration(duration));
            // ... new JLabel("Elapsed time - " + formatDuration(duration));
        }
    }
}