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

 
public class App extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) {
        
        Button button1 = new Button("Felső");
        Button button2 = new Button("Alsó");
        button1.setOnAction(e -> onButton1Click());
        button1.setOnAction(e -> onButton2Click());
        
        StackPane root = new StackPane();
        VBox vbox = new VBox(10);
        vbox.getChildren().addAll(button1, button2);
        root.getChildren().add(vbox);
        Scene scene = new Scene(root, 300, 250);
        stage.setScene(scene);
        stage.setTitle("Valami");
        stage.show();
    }

    private void onButton1Click() {
        System.out.println("1-s gomb kattintás");
    }
    private void onButton2Click() {
        System.out.println("2-s gomb kattintás");
    }

}