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                                            zhaojiale1213

ExtensionLoader类获取实现类的时候，为什么要加双重锁

![1654051021](https://user-images.githubusercontent.com/57434586/171316531-cfdb5f3e-3883-4a77-bf49-8e11d564ddd0.png) ![1654051059(1)](https://user-images.githubusercontent.com/57434586/171316608-bb905fb2-d643-4f92-a640-1a5da5d5614b.png) 第一个锁已经锁住了下面的代码了