问题
I was multiplying very two huge BigIntegervalues in a program. It failed. What are the limits of BigInteger and BigDecimal ?
回答1:
You won't get NumberFormatException multiplying large numbers. If the number produced is too large, you will get a cryptic NegativeArraySizeException as the size of the array overflows.
You are more likely to get an out of memory error.
The limit is 32 * 2^32-1 bits for BigInteger or about 2^(4 billion).
You can get a NumberFormatException if you
- create a BigInteger from an empty byte[]
- use a signum < -1 or > +1
- try to parse a number in base >36 or < 2
- have a string with illegal digits.
When you get an exception you should also look at the message and the stack trace as this usually gives you the real cause.
回答2:
there shouldn't be a limit, except for memory, but maybe there is, according to the implementation of the class (for example, some fields there might be int or long).
来源：https://stackoverflow.com/questions/17945985/what-are-the-limits-of-bigdecimal-and-biginteger