UUID到唯一的整数id？ [英] UUID to unique integer id?

问题描述

我想知道将UUID转换为唯一整数的最简单方法是什么？我尝试过使用哈希码，但人们告诉我，如果我使用哈希码，它并不总是唯一的？

I was wondering what the easiest way to convert a UUID to a unique integer would be? I have tried using the hash code but people tell me that it is not going to always be unique if i use the hash code?

那么最简单的方法是什么？哈希码是唯一的吗？

So what is the easiest way? Is the hash code unique?

推荐答案

您将遇到问题，因为UUID是128位且int只有32位。您要么必须接受碰撞的风险并尝试将其捏到较小的空间（ hashCode 可能是一个很好的方法）或者找到替代方案（使用直接 UUID ，映射到 BigInteger - 在不知道原因的情况下很难说出来。

You are going to have a problem since the UUID is 128 bits and the int is only 32bit. You'll either have to accept the risk of collisions and try to fudge it to a smaller space (hashCode is probably a good way to do that) or find an alternative (use the UUID directly, map to a BigInteger - difficult to tell without knowing why)

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