import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.scene.control.Button;
import javafx.event.ActionEvent;
import javafx.stage.Stage;
import javafx.event.EventHandler;

class Lytter implements EventHandler<ActionEvent> {
	@Override
	public void handle(ActionEvent ae) {
		javafx.application.Platform.exit();
	}
}

public class GUI extends Application {
	@Override
	public void start(Stage win) throws Exception {
		GridPane root = new GridPane();

		Scene scene = new Scene(root, 900, 700);

		Button button = new Button("Si hei");
		Lytter knappelytter = new Lytter();
		button.setOnAction(knappelytter);
		root.getChildren().add(button);

		win.setScene(scene);
		win.show();
		win.setTitle("et vindu!");
	}

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

	public GUI() {
		super();
	}
}