import java.util.concurrent.*;

public class Esempio2 {

    public static class Counter implements Runnable {
        int n=0;
        @Override
        public void run() {
            System.out.println(n);
            n++;}
    }

    public static void main(String[] args) {
        Counter r = new Counter() ;
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        executorService.scheduleAtFixedRate(r, 5, 1, TimeUnit.SECONDS);
        executorService.execute(r);
        try {
            TimeUnit.SECONDS.sleep(11);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Fine");
        executorService.shutdown(); }
}