import javafx.application.Application; import javafx.stage.Stage; import javafx.scene.Scene; import javafx.scene.layout.StackPane; public class App extends Application { @Override public void start(Stage stage) { StackPane root = new StackPane(); Scene scene = new Scene(root, 300, 250); stage.setScene(scene); stage.setTitle("Helló Világ!"); stage.show(); } public static void main(String[] args) { launch(args); } }