public Class<?> getColumnClass(int col)
    {
        Class<?> c = null;

        String name = getColumnName(col);
        if (name.indexOf("OrderID") >= 0)
        {
            c = String.class;
        }
        else if (name.indexOf("Price") >= 0)
        {
            c = Float.class;
        }
        else if (name.indexOf("Size") >= 0)
        {
            c = Integer.class;
        }
        else if (name.indexOf("Time") >= 0)
        {
            c = Date.class;
        }

        return c;
    }