Below is my current code. I want to generate a black square in the corners highlighted in red. Then I would like to stack a slightly smaller white square on top of the black squares in the corners. This must be done in JavaFX.

import java.util.Random;

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;

public class Main extends Application {
   int rowNum = 350;

   int colNum = 350;

   int gridHeight = 10; // to get bigger squares, increase gridHeight and gridWidth

   int gridWidth = 10;

   @Override
   public void start(Stage primaryStage) {
       try {
           GridPane grid = new GridPane();

           Random rand = new Random();

           Color[] colors = { Color.BLACK, Color.WHITE };

           for (int row = 0; row

               for (int col = 0; col

                   int n = rand.nextInt(2);

                   Rectangle rec = new Rectangle();

                   rec.setWidth(10);

                   rec.setHeight(10);

                   rec.setFill(colors[n]);

                   GridPane.setRowIndex(rec, row);

                   GridPane.setColumnIndex(rec, col);

                   grid.getChildren().addAll(rec);

               }
               Rectangle q1 = new Rectangle(20, 20, 200, 200);
               q1.setFill(Color.WHITE);
               q1.setStroke(Color.BLACK);
              

           }

           Scene scene = new Scene(grid, 600, 600);

           primaryStage.setTitle(“QR Code Sample”);

           primaryStage.setScene(scene);

           primaryStage.show();
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

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

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