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

public class HeiVerden extends Application {

    TextField textfelt = null;
    Button knapp = null;
    Label hilsenTekst = null;

    @Override
    public void start (Stage stage) {
        VBox pane = new VBox();
        pane.setAlignment(Pos.CENTER);
        
        Label skrivNavnTekst = new Label("Skriv inn navnet ditt: ");
        textfelt = new TextField("Navn");
        knapp = new Button("Si hei!");
        hilsenTekst = new Label("");
        
        KnappetrykksBehandler behandler = new KnappetrykksBehandler();
        knapp.setOnAction(behandler);

        pane.getChildren().addAll(skrivNavnTekst, textfelt, knapp, hilsenTekst);

        stage.setScene(new Scene(pane, 200, 100));
        stage.show();
    }

    class KnappetrykksBehandler implements EventHandler<ActionEvent> {

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