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() ;
	}
}