import  java.awt.*;

     public   static   void  centerWindow(Window window, Window parent)
    {

        Point p;
        Dimension d;

        Dimension scr = Toolkit.getDefaultToolkit().getScreenSize();
         if  (parent ==  null  || !parent.isShowing())
        {
            p =  new  Point( 0 ,  0 );
            d = scr;
        }
         else 
        {
            p = parent.getLocation();
            d = parent.getSize();
        }
        Dimension w = window.getSize();

        p.x += (d.width - w.width) /  2 ;
        p.y += (d.height - w.height) /  2 ;

         if  (p.x <  0 )
        {
            p.x =  0 ;
        }
         else   if  (p.x + w.width > scr.width)
        {
            p.x = scr.width - w.width;
        }

         if  (p.y <  0 )
        {
            p.y =  0 ;
        }
         else   if  (p.y + w.height > scr.height)
        {
            p.y = scr.height - w.height;
        }

        window.setLocation(p);
    }

 public   void  setLocationRelativeTo(Component c)