btCancel.setOnAction$($handler$)$;

HBox pane $=$ new HBox$(5)$;

pane.getChildren$().$ addAll$($btOK$,$ btCancel$)$;

Scene scene $=$ new Scene$($pane$,200,250)$;

primaryStage.$$etTitle$("$Test$")$; $//$ Set the stage title

primaryStage.setScene$($scene$)$; $//$ Place the scene in the stage

primaryStage.show$()$; $//$ Display the stage

$\}$

$\frac{?}{?}*****$

The main method is only needed for the IDE with limited JavaFX

support. Not needed for running from the command line.

$**\frac{*}{?}$

public static void main$($String$[]$ args$)\{$

launch$($args$)$;

$\}$

$\}$

$q,$

The program has a runtime error, because the handler is registered with more than one source.

When clicking the OK button, the program displays The OK button is clicked.

When clicking either button, the program displays The OK button is clicked twice.

When clicking the Cancel button, the program displays The OK button is clicked.