public StandardXYItemLabelGenerator(String formatString,
            NumberFormat xFormat, NumberFormat yFormat) {
        
        super(formatString, xFormat, yFormat);
    }

    /**
     * Creates an item label generator using the specified formatters.
     *
     * @param formatString  the item label format string (<code>null</code> 
     *                      not permitted).
     * @param xFormat  the format object for the x values (<code>null</code> 
     *                 not permitted).
     * @param yFormat  the format object for the y values (<code>null</code> 
     *                 not permitted).
     */
    public StandardXYItemLabelGenerator(String formatString,
            DateFormat xFormat, NumberFormat yFormat) {
        
        super(formatString, xFormat, yFormat);