Java Long parselong抛出数字格式异常 [英] Java Long parselong throwing Number Format exception

问题描述

我首先使用一个简单的代码

I have a simple code first I use this

Long.parseLong(4250120140405520712)

它有效，但是当我这样做

And it works but when I do this

Long.parseLong(42501201404055207123)

失败.添加一个额外的数字使其抛出数字格式异常.有人可以解释

It fails. Adding an extra digit makes it throw a Number Format Exception. Can someone please explain

推荐答案

假设您要将String s解析为long s:

Assuming you're parsing Strings into longs:

第一个有效的原因是数字4250120140405520712(19个数字)小于最大可能的长值

The first one works because the number 4250120140405520712 (19 digits) is less than the maximum possible long value, Long.MAX_VALUE, 9223372036854775807L.

第二个失败，因为它长20位，比9223372036854775807L大.

The second one fails because it's 20 digits long, bigger than 9223372036854775807L.

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