Problem in designing chess board

Question

I designed chess board before by making for loop for rows and anthor one for columns. But here i did inner for loop : one for row ant the other for column but only column appear and row not appear ...
My try:
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
public class MovePawnTest extends JFrame {
    private BoardGame board;
    public MovePawnTest() {
        board = new BoardGame();
        getContentPane().add(board, BorderLayout.CENTER);
    public static void main(String[] args) {
        MovePawnTest movePawnTest = new MovePawnTest();
        movePawnTest.setDefaultCloseOperation(MovePawnTest.EXIT_ON_CLOSE);
        movePawnTest.setSize(new Dimension(600, 300));
        movePawnTest.setLocationRelativeTo(null);
        movePawnTest.setVisible(true);
        movePawnTest.setExtendedState(MAXIMIZED_BOTH);
import java.awt.Graphics;
import javax.swing.JPanel;
public class BoardGame extends JPanel {
    private final int ROW = 8, COL = 8, x = 100, y = 60;
    private int[][] board;
    public BoardGame() {
        board = new int[ROW][COL];
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        drawBoard(g);
    private void drawBoard(Graphics g) {
        for (int i = 0; i < ROW; ++i) {
            for (int j = 0; j < COL; ++j) {
                g.drawLine((x * j) + 100, (y * i) + 60, (x * j) + 100, (y * i) + 60);
}please say me the
thanks in advance

Answer 1

ah fark
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.*;
@SuppressWarnings("serial")
public class ChessBoard extends JPanel{
  private static final int ROWS = 8;
  private static final int COLS = 8;
  private static final int WIDTH = 600;
  private static final Dimension SIZE = new Dimension(WIDTH, WIDTH);
  private static final Color COLOR1 = Color.white;
  private static final Color COLOR2 = Color.gray;
  public ChessBoard() {
    setPreferredSize(SIZE);
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    int panelWidth = getWidth();
    int panelHeight = getHeight();
    for (int row = 0; row < ROWS; row++) {
      double h = (double)panelHeight / ROWS;
      int y = (int)(h * row);
      for (int col = 0; col < COLS; col++) {
        double w = (double)panelWidth / COLS;
        int x = (int)(w * col);
        Color c = ((row % 2 == 0) ^ (col % 2 == 0)) ? COLOR1 : COLOR2;
        g.setColor(c);
        g.fillRect(x, y, (int)w, (int)h);       
  private static void createAndShowUI() {
    JFrame frame = new JFrame("ChessBoard");
    frame.getContentPane().add(new ChessBoard());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  public static void main(String[] args) {
    java.awt.EventQueue.invokeLater(new Runnable() {
      public void run() {
        createAndShowUI();
}