public void addValue(Number value, Comparable rowKey,
                         Comparable columnKey) {
        this.data.addValue(value, rowKey, columnKey);
        fireDatasetChanged();
    }

    /**
     * Adds a value to the table.
     *
     * @param value  the value.
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     *
     * @see #getValue(Comparable, Comparable)
     */
    public void addValue(double value, Comparable rowKey,
                         Comparable columnKey) {
        addValue(new Double(value), rowKey, columnKey);