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Update 类加载器.md

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@ -118,7 +118,11 @@ protected Class<?> loadClass(String name, boolean resolve)
### 如果我们不想用双亲委派模型怎么办？
为了避免双亲委托机制，我们可以自己定义一个类加载器，然后重写 `loadClass()` 即可。
~~为了避免双亲委托机制，我们可以自己定义一个类加载器，然后重写 `loadClass()` 即可。~~
完善修正（[issue871](https://github.com/Snailclimb/JavaGuide/issues/871)：类加载器一问的补充说明）：
**自定义加载器的话，需要继承 `ClassLoader` 。如果我们不想打破双亲委派模型，就重写 `ClassLoader` 类中的 `findClass()` 方法即可，无法被父类加载器加载的类最终会通过这个方法被加载。但是，如果想打破双亲委派模型则需要重写 `loadClass()` 方法**
## 自定义类加载器