Java Swing How to - Create Chess layout using GridLayout

Question

We would like to know how to create Chess layout using GridLayout.

Answer

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
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import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel {
  static int N = 8, SIZE = 75;

  public Main() {
    super(new GridLayout(N, N));
    this.setPreferredSize(new Dimension(N * SIZE, N * SIZE));
    for (int i = 0; i < N * N; i++) {
      this.add(new ChessButton(i));
    }
  }

  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(new Main());
    f.pack();
    f.setVisible(true);
  }
}

class ChessButton extends JButton {
  static int N = 8;

  public ChessButton(int i) {
    super(i / N + "," + i % N);
    this.setOpaque(true);
    this.setBorderPainted(false);
    if ((i / N + i % N) % 2 == 1) {
      this.setBackground(Color.gray);
    }
  }
}