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Merge pull request #2165 from galaxylzp/patch-1

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Update reflection.md
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@ -178,9 +178,10 @@ value is JavaGuide
```
**注意** : 有读者提到上面代码运行会抛出 `ClassNotFoundException` 异常,具体原因是你没有下面把这段代码的包名替换成自己创建的 `TargetObject` 所在的包 。
可以继续参考：https://www.cnblogs.com/chanshuyi/p/head_first_of_reflection.html
```java
Class<?> targetClass = Class.forName("cn.javaguide.TargetObject");
```
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