public static void main(String[] args) throws Exception {        long a = Long.MAX_VALUE;        long b = Long.MAX_VALUE;        BigDecimal ba = new BigDecimal(String.valueOf(a));        BigDecimal bb = new BigDecimal(String.valueOf(b));        BigDecimal bc = ba.multiply(bb);        System.out.println(String.valueOf(a));        System.out.println(String.valueOf(b));        System.out.println(bc);    }