javaFx dialogBox

There is no common dialog support. .....

do yourself...

Stage dialogStage = new Stage();
dialogStage.initModality(Modality.WINDOW_MODAL);
dialogStage.setScene(new Scene(VBoxBuilder.create().
    children(new Text("Hi"), new Button("Ok.")).
    alignment(Pos.CENTER).padding(new Insets(5)).build()));
dialogStage.show();

・controlsfx?　jdk8からサーポート

・javafx-dialogs-0.0.3.jar　使える、かなり便利！