Listing 1. VerticalSeparator Class

import java.applet.Applet;
import java.awt.* ;
public class VerticalSeparator extends Applet {
   private Color _light ;
   private Color _dark ;
   public void paint( Graphics g ) {
      g.setColor( Color.gray ) ;
      Dimension size = size() ;
      _light =
        getBackground().brighter().brighter();
      _dark  = a
        getBackground().darker().darker();
      int length = size.height ;
      int xPosition = ( size.width )/2 ;
      g.setColor( _dark ) ;
      g.drawLine( xPosition, 0, xPosition,
         length ) ;
      g.setColor( _light ) ;
      g.drawLine( xPosition+1, 0, xPosition+1,
         length ) ;
   }
   public Dimension getPreferredSize() {
      return new Dimension( 4,8 ) ;
   }
   public Dimension getMinimumSize() {
      return getPreferredSize() ;
   }
}