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

import java.util.Random;

public class Hei extends Application{
  Button knapp = null;

  @Override
  public void start(Stage stage){
    knapp = new Button("Si hei!");
    Knappebehandler knappebehandler = new Knappebehandler();
    knapp.setOnAction(knappebehandler);

    VBox pane = new VBox(knapp);
    Scene scene = new Scene(pane);
    stage.setScene(scene);
    stage.show();
  }

  class Knappebehandler implements EventHandler<ActionEvent>{
    @Override
    public void handle(ActionEvent e){
      String[] heiListe = {"Hei!", "Hello!", "Salut!", "Guten tag!", "اهلا", "¡Hola!", "Ciao!", "Cześć!", "你好"};
      Random rand = new Random();
      knapp.setText(heiListe[rand.nextInt(heiListe.length-1)]);
    }
  }
}