// declare imports
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class Demo extends Application {
	
	public static void main(String args[]) {
		Application.launch(Demo.class, args);
	}
	
	/*
	 * Create a BorderPane node whereby the center-most component is a
	 * random widget (in this case, a ProgressIndicator).
	 * */
	public BorderPane add_widget() {
		BorderPane layout_main = new BorderPane();
		
		// Instantiate an indeterminate ProgressIndicator object with a set-size
		ProgressIndicator bar = new ProgressIndicator();
		bar.setPrefSize(100, 100);
		
		// set indicator to center of layout and return to be added to root.
		layout_main.setCenter(bar); 
		return layout_main;
	}
	
	@Override
	public void start(Stage stage) throws Exception {
		// instantiate group and add widget as root node
		Group rootNode = new Group(); 
		rootNode.getChildren().add(this.add_widget());
		
		// declare behaviors of the scene, and make visible
		Scene scene = new Scene(rootNode);
		stage.setScene(scene);
		stage.setWidth(500);
		stage.setHeight(500);
		stage.setTitle("Example Application");
		stage.setVisible(true);
	}

}