获得 Java UUID.randomUUID 冲突的机会有多大？
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How big is the chance to get a Java UUID.randomUUID collision?
提问by daniels
I need to create some uniques files in Java and i plan to use UUID.randomUUID to generate their names. Is there any chance to get a collision for this? Should i do something like bellow os I shouldn't worry about this?
我需要在 Java 中创建一些唯一文件，我计划使用 UUID.randomUUID 来生成它们的名称。有没有机会为此发生碰撞？我应该做类似波纹管的事情吗，我不应该担心这个？
Integer attemptsToGenerateUUID = 1;
while (true) {
UUID fileUUID = UUID.randomUUID();
if (fileDoesNotExistwith this UUID name) {
save file;
break;
}
attemptsToGenerateUUID += 1;
if (attemptsToGenerateUUID > 64) {
return false;
}
}
采纳答案by óscar López
According to wikipedia, regarding the probability of duplicates in random UUIDs:
根据维基百科，关于随机 UUID 中重复的概率：
Only after generating 1 billion UUIDs every second for the next 100 years, the probability of creating just one duplicate would be about 50%. Or, to put it another way, the probability of one duplicate would be about 50% if every person on earth owned 600 million UUIDs.
只有在接下来的 100 年中每秒生成 10 亿个 UUID 之后，仅创建一个重复项的概率约为 50%。或者，换句话说，如果地球上每个人都拥有 6 亿个 UUID，一个重复的概率约为 50%。
I guess the same reasoning applies to Java's implementation of UUID. So no, you should not worry about this.
我想同样的推理也适用于 Java 的 UUID 实现。所以不，你不应该担心这个。
