如何在Java中将很大的String转换为数字

Question

Hi I have a big string like this :

"999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999"

I wish to convert this string to long. But I failed. I did:

Long.parseLong(longString);

But I'm getting an error:

java.lang.NumberFormatException: For input string: "99999999.......

Are there any way to avoid this?

Answer 1

像这样使用BigInteger类：

 BigInteger number = new BigInteger(longString);

Answer 2

You need to use BigInteger . Long may not accommodate that big number.

Here is javadoc for BigInteger .

Answer 3

you might use BigInteger rather than Long.

 BigInteger number = new BigInteger(longString);

Java BigInteger example

Answer 4

long: Reference

use 8-byte to store values from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

As mention before answer, use BigInteger .