import javafx.application.Application;
import javafx.scene.layout.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.stage.Stage;
import javafx.scene.text.*;
import javafx.scene.shape.Rectangle;
import javafx.scene.paint.*;
import javafx.event.*;

public class HeiPerson extends Application {

    public TextField tekstfelt = null;
    public Label tekst = null;

    @Override
    public void start(Stage stage) {
        VBox root = new VBox();

        Button knapp = new Button("Trykk!");

        // Vanlig metode
        knapp.setOnAction(new Knappebehandler());

        // Ved bruk av lambda
        // knapp.setOnAction((e) -> tekst.setText("Hei " + tekstfelt.getText()));
        
        tekstfelt = new TextField("Skriv ditt navn");
        tekst = new Label("...");

        root.getChildren().addAll(tekstfelt, knapp, tekst);

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

    class Knappebehandler implements EventHandler<ActionEvent> {
        public void handle(ActionEvent e) {
            String inputText = "Hei " + tekstfelt.getText();
            tekst.setText(inputText);
        }
    }
}