import javafx.application.Application;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;

public class HeiPerson extends Application{
    TextField tekstfelt = null;
    Label hilsen = null;

    @Override
    public void start(Stage stage) {
        VBox box = new VBox();
        Label merkelapp = new Label("Fyll inn navn:");
        tekstfelt = new TextField("Navn");
        Button knapp = new Button("Si hei!");
        Knappebehandler behandler = new Knappebehandler();
        knapp.setOnAction(behandler);
        hilsen = new Label("");

        box.getChildren().addAll(merkelapp, tekstfelt, knapp, hilsen);


        stage.setScene(new Scene(box, 200, 100));
        stage.show();
    }
    
    private class Knappebehandler implements EventHandler<ActionEvent> {
        @Override
        public void handle(ActionEvent e) {
            String hilsetekst = tekstfelt.getText();
            hilsen.setText(String.format("Hei paa deg, %s!", hilsetekst));
        }
    }
}