JavaFX:如何创建带有通知标记的应用程序图标？

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Region;
import javafx.stage.Stage;

public class NotificationIconApp extends Application {

    private int notificationCount = 0;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Notification Icon");

        Button appIcon = new Button();
        Image iconImage = new Image("path/to/icon.png");
        appIcon.setGraphic(new ImageView(iconImage));

        NotificationBadge notificationBadge = new NotificationBadge();
        appIcon.setGraphic(new StackPane(iconImage, notificationBadge));

        appIcon.setOnAction(e -> {
            // 点击应用程序图标的处理逻辑
            // ...
        });

        Scene scene = new Scene(new HBox(appIcon), 200, 100);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private class NotificationBadge extends Region {

        private final Label label;

        public NotificationBadge() {
            label = new Label();
            label.getStyleClass().add("notification-badge");
            label.setAlignment(Pos.CENTER);
            label.setPrefWidth(20);
            label.setPrefHeight(20);
            getChildren().add(label);
            updateNotificationCount();
        }

        public void updateNotificationCount() {
            label.setText(String.valueOf(notificationCount));
            label.setVisible(notificationCount > 0);
        }
    }

    // 其他代码...

}