import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class RectApplet2 extends Applet
{
  public static final int IDEAL_WIDTH = 200;
  public static final int IDEAL_HEIGHT = 200;

  public void paint(Graphics g)
  {
    g.setColor(Color.BLACK);

    g.fillRect(0, 0, getWidth(), getHeight());

    g.setColor(Color.WHITE);
    for (int x = 0; x < getWidth() / 2; x += 5)
    {
      int x1 = (getWidth() / 2) - x;
      int y1 = (getHeight() / 2) - x;
      g.drawRect(x1, y1, x * 2, x * 2);
    }
  }

  public static void main(String args[])
  {
    Applet applet = new RectApplet();
    Frame frame = new Frame();
    frame.addWindowListener(new WindowAdapter()
    {
      public void windowClosing(WindowEvent e)
      {
        System.exit(0);
      }
    });

    frame.add(applet);
    frame.setSize(IDEAL_WIDTH, IDEAL_HEIGHT);
    frame.show();
  }
}