import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.text.Text;
import javafx.scene.Scene;
import javafx.scene.text.Font;
import javafx.scene.layout.Pane;
import java.time.LocalTime;

public class KlokkeFasit extends Application {
    Text text = new Text(naa());
    static Thread traad;

    private class SekundTeller extends Thread {
        public void run() {
            boolean slutt = false;
            while (!slutt) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException ie) {
                    slutt = true;
                }

                text.setText(naa());
            }
        }
    }

    public void start(Stage stage) {
        text.setY(100);
        text.setFont(new Font(100));

        Pane root = new Pane(text);

        stage.setScene(new Scene(root));
        stage.setTitle("Klokken er");
        stage.show();

        traad = new SekundTeller();
        traad.start();
    }

    private String naa() {
        LocalTime t = LocalTime.now();
        return String.format("%02d:%02d:%02d", t.getHour(), t.getMinute(), t.getSecond());
    }

    public static void main(String[] args) {
        launch(args);
        traad.interrupt();
    }
}