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

class JButtonGrid extends JPanel {
    int rows, cols;
    CellButton[][] grid;

    JButtonGrid(int rows, int cols, int prefferedButtonSize) {
        super(new GridLayout(rows, cols));

        this.rows = rows;
        this.cols = cols;

        grid = new CellButton[cols][rows];
        for (int i = 0; i < cols; i++) {
            for (int j = 0; j < rows; j++) {

                int column = i;
                int row = j;

                grid[i][j] = new CellButton();
                grid[i][j].addActionListener(
                    new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                            grid[column][row].changeText();
                            System.out.printf("Celle på posisjon %d,%d%n", row, column);
                        }
                    }
                );
                grid[i][j].setPreferredSize(new Dimension(prefferedButtonSize, prefferedButtonSize));
                this.add(grid[i][j]);
            }
        }
    }

    private class CellButton extends JButton {
        private boolean alive = false;

        private CellButton() {
            super("X");
        }

        private void changeText() {
            if (alive) {
                this.setText("X");
            } else {
                this.setText("O");
            }
            alive = !alive;
        }
    }
}