java - 发生 Java UUID.randomUUID 冲突的机会有多大？

Question

这个问题在这里已经有了答案:

How good is Java's UUID.randomUUID? (10 个回答)

关闭 8年前.

我需要在 Java 中创建一些唯一文件，并且我计划使用 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操作系统的事情吗？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;
    }
}

Answer 1

根据wikipedia ，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.

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。