从JavaFX中的任务接口调用的嵌套函数更新标签

import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class UpdateLabelExample extends Application {

    private Label label;

    @Override
    public void start(Stage primaryStage) {
        label = new Label("Initial Text");

        VBox root = new VBox(label);
        Scene scene = new Scene(root, 200, 100);

        primaryStage.setScene(scene);
        primaryStage.show();

        Task<Void> task = new Task<Void>() {
            @Override
            protected Void call() throws Exception {
                // Simulate a long-running operation
                Thread.sleep(2000);

                // Update label text using nested function
                Platform.runLater(() -> updateLabel("Updated Text"));

                return null;
            }
        };

        new Thread(task).start();
    }

    private void updateLabel(String text) {
        label.setText(text);
    }

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