JavaFX: najprostszy zegar cyfrowy (sposób 1)

Najprostszy zegar cyfrowy można stworzyć na bazie etykietki Label albo tekstu Tekst. Ja wybrałam etykietkę Label.
Klasa Listing14c_01

package rozdzial14c;
import javafx.animation.*;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;

import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;

public class Listing14c_01 extends Application {
    private static final Font CLOCK_FONT =
            Font.font("Arial", FontWeight.BOLD, 20);
    private static final Background CLOCK_BACKGROUND =
            new Background(new BackgroundFill(Color.HONEYDEW,
            CornerRadii.EMPTY, new Insets(0, 0, 0, 0)));
    private Label label;
    private AnimationTimer timer;

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

    @Override
    public void start(Stage stage) {

        try {
            StackPane root = new StackPane();
            label = new Label();
            label.setFont(CLOCK_FONT);
            label.setTextFill(Color.GREEN);
            root.setBackground(CLOCK_BACKGROUND);
            root.getChildren().add(label);
            Scene scene = new Scene(root, 200, 50);
            stage.setScene(scene);
            stage.setTitle("Zegar Cyfrowy");
            stage.setOnCloseRequest(event -> {
                timer.stop();
                Platform.exit();
            });
            timer = new DigiTimer();
            timer.start();
            stage.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private class DigiTimer extends AnimationTimer {
        @Override
        public void handle(long now) {
            LocalTime lt = LocalTime.now();
            String text = lt.format(DateTimeFormatter.
                    ofLocalizedTime(FormatStyle.MEDIUM));
            label.textProperty().set(text);
        }
    }
}
Po uruchomieniu klasy zobaczymy (Rys. 14_01):
Prosty zegar cyfrowy — Rys. 14_01. Zegar cyfrowy