* <code>Box</code> using the constructor and pass in
     * <code>BoxLayout.PAGE_AXIS</code>, eg:
     * <pre>
     *   Box lineBox = new Box(BoxLayout.PAGE_AXIS);
     * </pre>
     *
     * @return the box
     */
    public static Box createVerticalBox() {
	return new Box(BoxLayout.Y_AXIS);
    }

    /**
     * Creates an invisible component that's always the specified size.
     * <!-- WHEN WOULD YOU USE THIS AS OPPOSED TO A STRUT? -->
     *
     * @param d the dimensions of the invisible component
     * @return the component
     * @see #createGlue
     * @see #createHorizontalStrut
     * @see #createVerticalStrut
     */
    public static Component createRigidArea(Dimension d) {
	return new Filler(d, d, d);
    }

    /**
     * Creates an invisible, fixed-width component.
     * In a horizontal box, 
     * you typically use this method 
     * to force a certain amount of space between two components.
     * In a vertical box,
     * you might use this method 
     * to force the box to be at least the specified width.
     * The invisible component has no height
     * unless excess space is available,
     * in which case it takes its share of available space,
     * just like any other component that has no maximum height.
     *
     * @param width the width of the invisible component, in pixels >= 0
     * @return the component
     * @see #createVerticalStrut
     * @see #createGlue
     * @see #createRigidArea
     */
    public static Component createHorizontalStrut(int width) {
	return new Filler(new Dimension(width,0), new Dimension(width,0), 
			  new Dimension(width, Short.MAX_VALUE));
    }

    /**
     * Creates an invisible, fixed-height component.
     * In a vertical box, 
     * you typically use this method
     * to force a certain amount of space between two components.
     * In a horizontal box,
     * you might use this method 
     * to force the box to be at least the specified height.
     * The invisible component has no width
     * unless excess space is available,
     * in which case it takes its share of available space,
     * just like any other component that has no maximum width.
     *
     * @param height the height of the invisible component, in pixels >= 0
     * @return the component
     * @see #createHorizontalStrut
     * @see #createGlue
     * @see #createRigidArea
     */
    public static Component createVerticalStrut(int height) {
	return new Filler(new Dimension(0,height), new Dimension(0,height), 
			  new Dimension(Short.MAX_VALUE, height));
    }

    /**
     * Creates an invisible "glue" component 
     * that can be useful in a Box
     * whose visible components have a maximum width
     * (for a horizontal box)
     * or height (for a vertical box).
     * You can think of the glue component
     * as being a gooey substance
     * that expands as much as necessary
     * to fill the space between its neighboring components.
     *
     * <p>
     *
     * For example, suppose you have
     * a horizontal box that contains two fixed-size components.
     * If the box gets extra space,
     * the fixed-size components won't become larger,
    * so where does the extra space go?
     * Without glue,
     * the extra space goes to the right of the second component.
     * If you put glue between the fixed-size components,
     * then the extra space goes there.
     * If you put glue before the first fixed-size component,
     * the extra space goes there,
     * and the fixed-size components are shoved against the right
     * edge of the box.