SudokuGUI

package com.company;

import javax.swing.*;
import java.awt.*;

public class SudokuGUI extends JFrame {
    public SudokuGUI()
    {
        SudokuBoard sudokuBoard = new SudokuBoard();
        this.setTitle("Sudoku Board");
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(9, 9));

        for (int i = 0; i < 9; i++) {
            for (int j = 0; j < 9; j++) {
                panel.add(sudokuBoard.grid[i][j]);
                sudokuBoard.grid[i][j].setPreferredSize(new Dimension(150, 50));
                sudokuBoard.grid[i][j].setHorizontalAlignment(JTextField.CENTER);
            }
        }

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.add(panel);
        this.pack();
        this.setVisible(true);

    }
}