如何从javafx控制器而不是CSS向按钮添加悬停属性

<Button fx:id="myButton" text="按钮" />

import javafx.fxml.FXML;
import javafx.scene.control.Button;

public class SampleController {
    @FXML
    private Button myButton;

    @FXML
    public void initialize() {
        myButton.setOnMouseEntered(event -> {
            myButton.setStyle("-fx-background-color: #CCCCCC;");
        });

        myButton.setOnMouseExited(event -> {
            myButton.setStyle("-fx-background-color: #FFFFFF;");
        });
    }
}

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class MainApp extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(MainApp.class.getResource("sample.fxml"));
            AnchorPane rootLayout = (AnchorPane) loader.load();

            SampleController controller = loader.getController();

            Scene scene = new Scene(rootLayout);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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