java - 如何在 Java 中将非常大的字符串转换为数字

Question

你好，我有一个像这样的大字符串:

"999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999"

我想把这个字符串转换成长字符串。但是我失败了。我做了:

Long.parseLong(longString);

但是我得到一个错误:

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

有什么办法可以避免这种情况吗？

Answer 1

使用BigInteger像这样上课:

 BigInteger number = new BigInteger(longString);