How can I implement a comfirmation window when closing the javafx applications?

Hi, guys
I would add a confirmation window when the user closes my javafx application, if the user clicks Yes, I close the application, so no, I wouldn't close it, how can I implement this feature?
 
primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>(){

               @Override
               public void handle(WindowEvent arg0) {
                    try
                    {
                         //todo
                    }
                    catch(Exception ex)
                    {
                         System.out.print(ex.getMessage()+"\r\n");
                    }

               }
        });

Hello. Here is an example:

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.paint.Color;
import javafx.scene.layout.*;
import javafx.scene.control.*;

public class ModalDialog {

    public ModalDialog(final Stage stg) {
     final Stage stage = new Stage();
        //Initialize the Stage with type of modal
        stage.initModality(Modality.APPLICATION_MODAL);
        //Set the owner of the Stage
        stage.initOwner(stg);
        Group group =  new Group();
        HBox hb = new HBox();
         hb.setSpacing(20);
        hb.setAlignment(Pos.CENTER);
        Label label = new Label("You are about to close \n your application: ");
        Button no  = new Button("No");

        no.setOnAction(new EventHandler() {

            public void handle(ActionEvent event) {
                   stage.hide();
            }
        });
        Button yes  = new Button("Yes");
        yes.setOnAction(new EventHandler() {

            public void handle(ActionEvent event) {
                   stg.close();
            }
        });

         hb.getChildren().addAll(yes, no);
         VBox vb =  new VBox();
         vb.setSpacing(20);
         vb.setAlignment(Pos.CENTER);
         vb.getChildren().addAll(label,hb);
        stage.setTitle("Closing ...");
        stage.setScene(new Scene( vb, 260, 110, Color.LIGHTCYAN));
        stage.show();

    }

}

Test:

   import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.stage.*;

/**
 *
 * @author Shakir
 */
public class ModalTest extends Application {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Application.launch(ModalTest.class, args);
    }

    @Override
    public void start(final Stage primaryStage) {
        primaryStage.setTitle("Hello World");
        Group root = new Group();
        Scene scene = new Scene(root, 300, 250, Color.LIGHTGREEN);

       primaryStage.setOnCloseRequest(new EventHandler(){

               @Override
               public void handle(WindowEvent arg0) {
                                arg0.consume();
                    try
                    {
                     ModalDialog md = new ModalDialog(primaryStage);
                                }
                    catch(Exception ex)
                    {
                         System.out.print(ex.getMessage()+"\r\n");
                    }

               }
        });

        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

Tags: Java

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