JavaFX Button handle click event using Lambda

// Use an image with a button. 

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.Label;
import javafx.scene.image.ImageView;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class Main extends Application {
  private Label response;
  public static void main(String[] args) {
    launch(args);/*from  w  w  w.  j a  v a 2  s  .co m*/
  }

  public void start(Stage myStage) {
    myStage.setTitle("Use Images with Buttons");

    FlowPane rootNode = new FlowPane(10, 10);

    rootNode.setAlignment(Pos.CENTER);

    Scene myScene = new Scene(rootNode, 250, 450);

    myStage.setScene(myScene);

    // Create a label.
    response = new Label("Push a Button");

    // Create buttons.
    Button ok = new Button("OK");
    Button cancel = new Button("Cancel");


    // Handle the action events for the OK button.
    ok.setOnAction(e->{
        response.setText("OK Pressed");     
    });

    // Handle the action events for the cancel button.
    cancel.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent ae) {
        response.setText("Cancel Pressed");
      }
    });

    // Add the label and buttons to the scene graph.
    rootNode.getChildren().addAll(ok, cancel, response);

    myStage.show();
  }
}