APCS RedCross

// RedCross
// author: Lukas Goodman

import java.awt.Graphics;
import java.awt.Color;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 *  This program displays a red cross on a white
 *  background.
 */

public class RedCross extends JPanel
{
  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);  // Call JPanel's paintComponent method
                              //   to paint the background
    int xCenter = getWidth() / 2;
    int yCenter = getHeight() / 2;

    int b = ((getHeight() / 16) * 3);

    g.setColor(Color.WHITE);
    g.fillRect(0,0, xCenter - b / 2, yCenter - b / 2);
    g.fillRect(xCenter + b / 2,0, xCenter - b / 2, yCenter - b / 2);
    g.fillRect(xCenter + b / 2, yCenter + b / 2, xCenter - b / 2, yCenter - b / 2);
    g.fillRect(0, yCenter + b / 2, xCenter - b / 2, yCenter - b / 2);
    g.fillRect(0, yCenter - (b / 2), (xCenter - ((10 * b) / 6)), b);
    g.fillRect((xCenter + (10 * b) / 6), yCenter - (b / 2), (xCenter - ((10 * b) / 6)), b);
    g.fillRect(xCenter- (b / 2), 0, b, b);
    g.fillRect(xCenter - (b/ 2), getHeight() - b, b, b);

  }

  public static void main(String[] args)
  {
    JFrame window = new JFrame("Red Cross");
    window.setBounds(400, 300, 400, 300);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    RedCross panel = new RedCross();
    panel.setBackground(Color.RED);
    Container c = window.getContentPane();
    c.add(panel);
    window.setVisible(true);
  }
}