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

public class Cross extends JPanel {
   public Cross() {
      setBackground(Color.white);
   }
   private void cross(int width, int height, Graphics page) {
      int[] x0 = {
         width/10, width - width/5, 
         width - width/10, width/5
      };
      int[] y = {
         height/5, height - height/10,
         height - height/5, height/10
      };
      page.fillPolygon(x0,y,4);
      int[] x1 = {
         width - width/10, width/5,
         width/10, width - width/5
      };
      page.fillPolygon(x1,y,4);
   }
   public void paintComponent(Graphics page) {
       ((Graphics2D) page).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON); 
       ((Graphics2D) page).setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
            RenderingHints.VALUE_TEXT_ANTIALIAS_ON); 

       int width = getWidth();
       int height = getHeight();
       page.setColor(Color.white);
       page.fillRect(0, 0, width, height);
       page.setColor(Color.black);
       cross(width, height, page);
   } 
}