code: import java.awt.*;
  import static java.awt.Color.*;
  import javax.swing.*;
  
  public class ColourPinstripeDisplay extends JPanel {
      final static Color[] palette = {black, red, green, blue, magenta,cyan,
          yellow, white};
  
      final int bands = 4;
  
      public ColourPinstripeDisplay() {
          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(palette[colIndex % palette.length]);
                  g.fillRect(x, (b - 1) * (h / bands), x + b, b * (h / bands));
              }
          }
      }
  
      public static void main(String[] args) {
          SwingUtilities.invokeLater(() -> {
              JFrame f = new JFrame();
              f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              f.setTitle("ColourPinstripeDisplay");
              f.add(new ColourPinstripeDisplay(), BorderLayout.CENTER);
              f.pack();
              f.setLocationRelativeTo(null);
              f.setVisible(true);
          });
      }
  }
  