Menu.setOnHidden(EventHandler < Event > value) has the following syntax.
public final void setOnHidden(EventHandler < Event > value)
In the following code shows how to use Menu.setOnHidden(EventHandler < Event > value) method.
import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.Event; import javafx.event.EventHandler; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.Menu; import javafx.scene.control.MenuBar; import javafx.scene.control.MenuItem; import javafx.scene.control.SeparatorMenuItem; import javafx.scene.paint.Color; import javafx.stage.Stage; //from w w w .ja va 2 s.c om public class Main extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(final Stage primaryStage) { primaryStage.setTitle("title"); Group root = new Group(); Scene scene = new Scene(root, 400, 300, Color.WHITE); MenuBar menuBar = new MenuBar(); menuBar.prefWidthProperty().bind(primaryStage.widthProperty()); Menu menu = new Menu("File"); menu.setOnHidden(new EventHandler<Event>(){ @Override public void handle(Event arg0) { } }); MenuItem newItem = new MenuItem("New", null); newItem.setOnAction(new EventHandler<ActionEvent>() { public void handle(ActionEvent event) { System.out.println("Action"); } }); menu.getItems().add(newItem); menu.getItems().add(new SeparatorMenuItem()); menuBar.getMenus().add(menu); root.getChildren().add(menuBar); primaryStage.setScene(scene); primaryStage.show(); } }