// Graphic1.java

import java.awt.*;

public class Problem5 extends LabFrame {

    public void paint(Graphics g) {
        int x, y;
        int step = 40;
        int color = 0;

        y = 0;
        while (y < 400) {
            x = 0;
            while (x < 400) {
                // Alternate the color
                if (color == 0) {
                    g.setColor(Color.red);
                    color = 1;
                } else {
                    g.setColor(Color.black);
                    color = 0;
                }
                g.fillRect(x, y, step, step);
                x = x + step;
            }
            y = y + step;
            // Alternate the color at the end of the row, too.
            if (color == 0) {
                g.setColor(Color.red);
                color = 1;
            } else {
                g.setColor(Color.black);
                color = 0;
            }
        }

    }

    public static void main(String[] args) {
        LabFrame f = new Problem5();
        f.setSize(400, 400);
        f.setVisible(true);
    }
}