可以很直观地写出对堆栈类的单元测试。

Writing a unit test for a Stack class is straightforward.

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当服务器报告一个意外的异常时，您可以检查关联堆栈跟踪的类和方法，来确定哪个应用程序导致了异常或者与异常有关。

When the server reports an unexpected exception, you can examine the classes and methods of the associated stack trace to determine which application caused, or was involved in, the exception.

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调用类和它的上级（即所有在它 上面的堆栈帧）的权限集都 不包括在交集计算中。

The permissions sets of the caller class and its ancestors (that is, all stack frames above this one) are not included in computing the intersection set.

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