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

public class MyFirstSceneBuilderApp extends Application {
   
   public void start(Stage primaryStage) throws Exception {
      Parent root = FXMLLoader.load(getClass().getResource("myFirstButton.fxml"));
      primaryStage.setTitle("My First Button Scene Builder App");
      primaryStage.setScene(new Scene(root,300,200));
      primaryStage.show(); 
   }
}