第225页12.5观察者模式的简单实现第一段 “前言”的科技信息应该是 “前沿”的科技信息

[jiawei-i]

[hehonghui]

好的，谢谢 。

2016-05-16 15:05 GMT+08:00 jiawei-i notifications@github.com:

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