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

public class HeiPerson extends Application {

    public TextField tekstfelt = null;
    public Label hilsen = null;

    @Override
    public void start(Stage stage) {

        VBox rot = new VBox();
        rot.setAlignment(Pos.CENTER);

        Label merkelapp = new Label("Fyll inn navn: ");
        tekstfelt = new TextField("- navn - ");

        Button knapp = new Button("Klikk her!");
        KnappBehandler behandler = new KnappBehandler();
        knapp.setOnAction(behandler);

        hilsen = new Label("");

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

        stage.setScene(new Scene(rot, 300, 100));
        stage.setTitle("Personlig hilsen");
        stage.show();

    }

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

    class KnappBehandler implements EventHandler<ActionEvent> {

        @Override
        public void handle(ActionEvent e) {
            String navn = tekstfelt.getText();
            hilsen.setText("Hei paa deg, " + navn + "!");
        }

    }
}