(Display circles) Write a Java program that displays ovals, as shown in Figure 18.12b. The circles are centered in the pane. The gap between two adjacent circles is 10 pixels, and the gap between the border of the pane and the largest circle is also 10

/*********************************************************************************
* (Display circles) Write a Java program that displays ovals, as shown in Figure *
* 18.12b. The circles are centered in the pane. The gap between two adjacent     *
* circles is 10 pixels, and the gap between the border of the pane and the       *
* largest circle is also 10.                                                     *
*********************************************************************************/
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.geometry.Insets;
import javafx.scene.shape.Circle;
import javafx.scene.paint.Color;

public class Exercise_18_20 extends Application {
	protected static StackPane pane = new StackPane();

	@Override // Override the start method in the Application class
	public void start(Stage primaryStage) {
		int numberOfCircles = 16; // Number of ovals
		addCircles(numberOfCircles);
		pane.setPadding(new Insets(10, 10, 10, 10));

		// Create a scene and place it in the stage
		Scene scene = new Scene(pane);
		primaryStage.setTitle("Exercise_18_20"); // Set the stage title
		primaryStage.setScene(scene); // Place the scene in the stage
		primaryStage.show(); // Display the stage
	}

	/** Method adds n circles to pane recursively */
	public static void addCircles(int n) {
		if (n > 0) {
			Circle circle = new Circle(10 * n);
			circle.setFill(Color.WHITE);
			circle.setStroke(Color.BLACK);
			pane.getChildren().add(circle);
			addCircles(n - 1); // Recursive call
		}
	}
}