import java.text.SimpleDateFormat;
import java.util.Date;

public class Time {

    public static void main(String... args) throws InterruptedException {
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
        while(true) {
            System.out.printf("\r%s", sdf.format(new Date()));
            Thread.sleep(1000);
        }
    }
}