如何创建一个接受参数的FXML处理程序？

import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.event.ActionEvent;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class FXMLController {
    @FXML
    private Button myButton;
    
    @FXML
    private Label myLabel;
    
    private String parameter;
    
    public void setParameter(String parameter) {
        this.parameter = parameter;
    }
    
    @FXML
    private void handleButtonAction(ActionEvent event) {
        myLabel.setText("Parameter: " + parameter);
    }
    
    public static void main(String[] args) {
        launch(args);
    }
    
    public void start(Stage primaryStage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
        Parent root = loader.load();
        
        FXMLController controller = loader.getController();
        controller.setParameter("Hello World!");
        
        primaryStage.setTitle("FXML Example");
        primaryStage.setScene(new Scene(root, 300, 200));
        primaryStage.show();
    }
}