* If you put glue before the first fixed-size component
     * and after the second fixed-size component,
     * the fixed-size components are centered in the box.
     *
     * <p>
     *
     * To use glue,
     * call <code>Box.createGlue</code>
     * and add the returned component to a container.
     * The glue component has no minimum or preferred size,
     * so it takes no space unless excess space is available.
     * If excess space is available, 
     * then the glue component takes its share of available
     * horizontal or vertical space,
     * just like any other component that has no maximum width or height.
     *
     * @return the component
     */
    public static Component createGlue() {
	return new Filler(new Dimension(0,0), new Dimension(0,0), 
			  new Dimension(Short.MAX_VALUE, Short.MAX_VALUE));
    }

    /**
     * Creates a horizontal glue component.
     *
     * @return the component
     */
    public static Component createHorizontalGlue() {
	return new Filler(new Dimension(0,0), new Dimension(0,0), 
			  new Dimension(Short.MAX_VALUE, 0));
    }

    /**
     * Creates a vertical glue component.
     *
     * @return the component
     */
    public static Component createVerticalGlue() {
	return new Filler(new Dimension(0,0), new Dimension(0,0), 
			  new Dimension(0, Short.MAX_VALUE));
    }

    /**
     * Throws an AWTError, since a Box can use only a BoxLayout.
     *
     * @param l the layout manager to use
     */
    public void setLayout(LayoutManager l) {
	throw new AWTError("Illegal request");
    }

    /**
     * Paints this <code>Box</code>.  If this <code>Box</code> has a UI this
     * method invokes super's implementation, otherwise if this
     * <code>Box</code> is opaque the <code>Graphics</code> is filled
     * using the background.
     *
     * @param g the <code>Graphics</code> to paint to
     * @throws NullPointerException if <code>g</code> is null
     * @since 1.6
     */
    protected void paintComponent(Graphics g) {
        if (ui != null) {
            // On the off chance some one created a UI, honor it
            super.paintComponent(g);
        } else if (isOpaque()) {
            g.setColor(getBackground());
            g.fillRect(0, 0, getWidth(), getHeight());
        }
    }


    /**
     * An implementation of a lightweight component that participates in
     * layout but has no view.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans<sup><font size="-2">TM</font></sup>
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    public static class Filler extends JComponent implements Accessible {

	/**
	 * Constructor to create shape with the given size ranges.
	 *
	 * @param min   Minimum size
	 * @param pref  Preferred size
	 * @param max   Maximum size
	 */
        public Filler(Dimension min, Dimension pref, Dimension max) {
            setMinimumSize(min);
            setPreferredSize(pref);
            setMaximumSize(max);
	}