GamePanel.java

import javax.swing.*;
import java.awt.*;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;
import javax.swing.border.EmptyBorder;

public class GamePanel extends JPanel {
 private SquareButton[] buttons;
 private static final int PADDING = 10;
 private static final Color BACKGROUND_COLOR = new Color(95, 67, 42);
 private static final Color BORDER_COLOR = new Color(128, 80, 38);

 public GamePanel() {
 buttons = new SquareButton[64];
 setLayout(new GridLayout(8, 8));
 initializeButtons();

 setBackground(BACKGROUND_COLOR);
 setBorder(new EmptyBorder(PADDING, PADDING, PADDING, PADDING));

 // Add an inner margin to thicken the cell borders outer rim, so it looks like
 // the board is made of lines instead of cells
 // I don't like working with java swing :(
 Border innerMargin = new LineBorder(BORDER_COLOR, 5);
 setBorder(BorderFactory.createCompoundBorder(getBorder(), innerMargin));
 }

 private void initializeButtons() {

 for (int i = 0; i < 8; i++) {
 for (int j = 0; j < 8; j++) {
 final Color color = (j % 2 + (i % 2) == 1) ? new Color(169, 121, 79) : new Color(235, 177, 126);
 final int index = (i * 8) + j;

 buttons[index] = new SquareButton("");
 buttons[index].setBackground(color);
 buttons[index].setFont(new Font("Arial", Font.PLAIN, 30));
 add(buttons[index]);
 }
 }
 }

 public SquareButton[] getButtons() {
 return buttons;
 }
}