JavaFX Circle set fill

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

public class ShowCircle extends Application {
  @Override//  ww  w.  j a va 2 s  .  c o  m
  public void start(Stage primaryStage) {
    // Create a circle and set its properties
    Circle circle = new Circle();
    circle.setCenterX(100);
    circle.setCenterY(100);
    circle.setRadius(50);
    circle.setStroke(Color.BLACK);
    circle.setFill(null);
    
    // Create a pane to hold the circle 
    Pane pane = new Pane();
    pane.getChildren().add(circle);
    

    Scene scene = new Scene(pane, 200, 200);
    primaryStage.setTitle("ShowCircle");
    primaryStage.setScene(scene);
    primaryStage.show();
  }
  

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