Как открыть второе окно в javafx?

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import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        Button openButton = new Button("Открыть второе окно");
        openButton.setOnAction(e -> openSecondWindow());

        StackPane root = new StackPane();
        root.getChildren().add(openButton);

        Scene scene = new Scene(root, 300, 200);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void openSecondWindow() {
        Stage secondStage = new Stage();
        Button closeButton = new Button("Закрыть");
        closeButton.setOnAction(e -> secondStage.close());

        StackPane secondRoot = new StackPane();
        secondRoot.getChildren().add(closeButton);

        Scene secondScene = new Scene(secondRoot, 200, 100);
        secondStage.setScene(secondScene);
        secondStage.show();
    }
}