import javax.swing.JComponent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;

public class CheckerBoardComponent extends JComponent
{
   public void paintComponent(Graphics g)
   {
      Graphics2D g2 = (Graphics2D) g;
      g.setColor(Color.RED);
      g.fillRect(0, 0, 50, 50);
      g.fillRect(100, 0, 50, 50);
      g.fillRect(0, 100, 50, 50);
      g.fillRect(50, 50, 50, 50);
      g.fillRect(100, 100, 50, 50);
   }
}