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蒙圈

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#1 Created at ... [Delete] [Delete and Lock User]

感觉已经没有状态了，看了快一天了

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#2 Created at ... [Delete] [Delete and Lock User]

第n次看到这了，级别不够，依然蒙圈，不过前面的确实写得好

之前是无知了

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#3 Created at ... [Delete] [Delete and Lock User]

好像有点悟了，就是一个工具方法

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#4 Created at ... [Delete] [Delete and Lock User]

由于，n = n + 1;

是非原子操作，所以线程不安全。

可以使用 addAndGet（）方法

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#5 Created at ... [Delete] [Delete and Lock User]

do whlie 的作用，是保证，别人修改了 数据也能正确执行

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