JTextField displayCells[] = new JTextField[9];

        JButton solve = new JButton("Solve");
        JButton solveSmarter = new JButton("Solve Smarter");
        JFrame sudoku = new JFrame("Sudoku");
        sudoku.setBounds(10,10,300,300);
       
        JButton clear = new JButton("Clear");
        JPanel sudokuPanel = new JPanel();
    
        for(int i = 0;i<8;i++){
            sudokuPanel.add(displayCells[i]);
        }