如何知道JavaFX中的微调器是否在增加？

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Spinner;
import javafx.scene.control.SpinnerValueFactory;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        Spinner<Integer> spinner = new Spinner<>();
        SpinnerValueFactory<Integer> valueFactory = new SpinnerValueFactory.IntegerSpinnerValueFactory(0, 100, 0);
        spinner.setValueFactory(valueFactory);

        VBox root = new VBox(spinner);
        Scene scene = new Scene(root, 200, 100);
        primaryStage.setScene(scene);
        primaryStage.show();

        int firstValue = spinner.getValue();
        // 模拟增加操作
        spinner.increment();
        int secondValue = spinner.getValue();

        if (secondValue > firstValue) {
            System.out.println("微调器在增加");
        } else {
            System.out.println("微调器没有增加");
        }
    }

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