Java 如何访问'；从FXML控制器在我的主类中初始化

在我的主课上我有

public class Main extends Application {

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

    public String versionNumber = "v2.1";

    @Override
    public void start(Stage primaryStage) throws Exception{

        // SETTING UP THE STAGE
        Stage window;
        window = primaryStage;
        window.setTitle("Support Tool " + versionNumber);


        // SETTING UP THE SCENES
        Parent parentNewCallDetails = FXMLLoader.load(getClass().getResource("newCallDetails.fxml"));
        Scene scnNewCallDetails = new Scene (parentNewCallDetails, 800, 600);

        // CHOOSING THE SCENE AND SHOWING THE STAGE
        window.setScene(scnNewCallDetails);
        window.show();

    }

}

我基本上希望能够从FXML控制器中的以下代码中访问字符串versionNumber，在这里我设置了我要启动的下一个场景的标题

public class newCallController {

    // ACTION COMPLETED WHEN CALL BUTTON IS PRESSED
    public void btnCall(MouseEvent event) throws IOException {

        // TODO LAUNCH THE NEXT CALL WINDOW
        Parent fxmlMainCallWindow = FXMLLoader.load(getClass().getResource("mainCallWindow.fxml"));
        Scene scnMainCallWindow = new Scene(fxmlMainCallWindow, 1000, 800);

        Stage window = (Stage)((Node)event.getSource()).getScene().getWindow();
        // THIS IS WHERE I WANT TO ACCESS THE VERSIONNUMBER STRING
        window.setTitle("Support Tool " + versionNumber);
        window.setScene(scnMainCallWindow);

    }

}

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可以使用静态字符串param定义常量类。你可以在任何地方使用它。比如：Constants.VERSION

public class Constants {
    public static final String VERSION = "v2.1";
}

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这个很好用，谢谢！