Как нарисовать круг в javafx?

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

    @Override
    public void start(Stage primaryStage) {
        Circle circle = new Circle(100, 100, 50);
        circle.setFill(Color.BLUE);

        Pane root = new Pane();
        root.getChildren().add(circle);

        Scene scene = new Scene(root, 300, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

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import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class Main extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        Canvas canvas = new Canvas(300, 300);
        GraphicsContext gc = canvas.getGraphicsContext2D();
        
        gc.setFill(Color.BLUE);
        gc.fillOval(100, 100, 100, 100);

        StackPane root = new StackPane();
        root.getChildren().add(canvas);

        Scene scene = new Scene(root, 300, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}