JavaFX VBox create traffic light

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class Main extends Application {
   @Override /*from w  w  w.j av a2  s . c  o m*/
   public void start(Stage primaryStage) {
      // Create a vbox
      VBox paneForCircles = new VBox(5);
      paneForCircles.setAlignment(Pos.CENTER);

      // Create three circles
      Circle c1 = getCircle();
      Circle c2 = getCircle();
      Circle c3 = getCircle();
      c1.setFill(Color.RED);

      paneForCircles.getChildren().addAll(c1, c2, c3);

      // Create a rectangle
      Rectangle rectangle = new Rectangle();
      rectangle.setFill(Color.WHITE);
      rectangle.setWidth(30);
      rectangle.setHeight(100);
      rectangle.setStroke(Color.BLACK);
      rectangle.setStrokeWidth(2);
      StackPane stopSign = new StackPane(rectangle, paneForCircles);

      // Create a hbox
      HBox paneForRadioButtons = new HBox(5);
      paneForRadioButtons.setAlignment(Pos.CENTER);

      // Create radio buttons
      RadioButton rbRed = new RadioButton("Red");
      RadioButton rbYellow = new RadioButton("Yellow");
      RadioButton rbGreen = new RadioButton("Green");

      // Create a toggle group
      ToggleGroup group = new ToggleGroup();
      rbRed.setToggleGroup(group);
      rbYellow.setToggleGroup(group);
      rbGreen.setToggleGroup(group);
      rbRed.setSelected(true);
      paneForRadioButtons.getChildren().addAll(rbRed, rbYellow, rbGreen);

      // Create a border pane
      BorderPane pane = new BorderPane();
      pane.setCenter(stopSign);
      pane.setBottom(paneForRadioButtons);

      // Create and register handlers
      rbRed.setOnAction(e -> {
         if (rbRed.isSelected()) {
            c1.setFill(Color.RED);
            c2.setFill(Color.WHITE);
            c3.setFill(Color.WHITE);
         }
      });

      rbYellow.setOnAction(e -> {
         if (rbYellow.isSelected()) {
            c1.setFill(Color.WHITE);
            c2.setFill(Color.YELLOW);
            c3.setFill(Color.WHITE);
         }
      });

      rbGreen.setOnAction(e -> {
         if (rbGreen.isSelected()) {
            c1.setFill(Color.WHITE);
            c2.setFill(Color.WHITE);
            c3.setFill(Color.GREEN);
         }
      });

      // Create a scene and place it in the stage
      Scene scene = new Scene(pane, 200, 150);
      primaryStage.setTitle("java2s.com");
      primaryStage.setScene(scene);
      primaryStage.show();
   }

   private Circle getCircle() {
      Circle c = new Circle(10);
      c.setFill(Color.WHITE);
      c.setStroke(Color.BLACK);
      return c;
   }
}