import java.awt.*;
import javax.swing.*;

public class PinstripeDisplay extends JPanel {

    final int bands = 4;

    public PinstripeDisplay() {
        setPreferredSize(new Dimension(900, 600));
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        int h = getHeight();
        for (int b = 1; b <= bands; b++) {
            for (int x = 0, colIndex = 0; x < getWidth(); x += b, colIndex++) {
                g.setColor(colIndex % 2 == 0 ? Color.white : Color.black);
                g.fillRect(x, (b - 1) * (h / bands), x + b, b * (h / bands));
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.setTitle("PinstripeDisplay");
                f.add(new PinstripeDisplay(), BorderLayout.CENTER);
                f.pack();
                f.setLocationRelativeTo(null);
                f.setVisible(true);
            }
        });
    }
}