A JavaFX App That Takes Up the Whole Screen (Primary)

FullScreenApp.java

public class FullScreenApp extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {

        VBox vbox = new VBox(new Label("Hello, World!"));
        vbox.setAlignment(Pos.TOP_CENTER);  // 0, auto

        Scene scene = new Scene( vbox );

        primaryStage.setScene( scene );
        primaryStage.setWidth(Screen.getPrimary().getBounds().getWidth());
        primaryStage.setHeight(Screen.getPrimary().getBounds().getWidth());
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}