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Commit 394a7b9

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优化"如何测试 private 方法,变量或者内部类"并添加到首页
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‎README.md

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* [StringBuilder和StringBuffer有哪些区别呢](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/stringbuilder-and-stringbuffer.md)
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* [为什么处理排序的数组要比非排序的快](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/Why-is-processing-a-sorted-array-faster-than-an-unsorted-array.md)
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> 测试
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* [如何测试 private 方法,变量或者内部类](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/How_to_test_a_class_that_has_private_methods,_fields_or_inner_classes.md)
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### 待翻译问题链接(还剩x问题)
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- [Why is subtracting these two times (in 1927) giving a strange result?](http://stackoverflow.com/questions/6841333/why-is-subtracting-these-two-times-in-1927-giving-a-strange-result)

‎contents/How_to_test_a_class_that_has_private_methods,_fields_or_inner_classes.md

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# 如何使用 junit 测试 private 方法,变量或者内部类
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# 如何测试 private 方法,变量或者内部类
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当你需要测试一个遗留的应用程序,且不能更改方法的可见性时,那测试私有方法/属性的最好方式就是使用[反射](https://en.wikipedia.org/wiki/Reflection_%28computer_programming%29)。
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当你需要测试一个遗留的应用程序,且不能更改方法的可见性时,那么,测试私有方法/属性的最好方式就是使用[反射](https://en.wikipedia.org/wiki/Reflection_%28computer_programming%29)。
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实际测试时,可以通过一些反射辅助类设置和获取私有(静态)的变量和调用私有(静态)方法。遵循下面的窍门,你可以很好地处理私有方法和变量的测试。
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实际测试时,可以通过一些反射辅助类,设置和获取私有(静态)的变量、调用私有(静态)方法。遵循下面的窍门,你可以很好地处理私有方法和变量的测试。
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```
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Method method = targetClass.getDeclaredMethod(methodName, argClasses);
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field.set(object, value);
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```
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> note:
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> 1. `targetClass.getDeclaredMethod(methodName, argClasses)`这个方法能让你获取到私有方法。`getDeclaredField`让你获取到私有变量
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> 2. 在对私有变量(方法)进行处理前,需要先`setAccessible(true)`
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stackoverflow原址:http://stackoverflow.com/questions/34571/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes

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