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刚看了几行

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

怎么这么像枚举

不器

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

你猜为啥是enum

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

感觉以前看了个寂寞。。。

一文带你搞定单例模式 - 知乎 (zhihu.com)

多线程，真是太让人头大了。

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