Core — Base exception classes and environment information.

core—基本异常类和环境信息。

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If such classes are not available at runtime, it'll throw that exception.

如果这样的类在运行时不可用，它会抛出该异常。

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Design classes so that an exception is never thrown in normal use.

类的设计应使在正常使用中从不引发异常。

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Design classes so that an exception is never thrown in normal use.

类的设计应使在正常使用中从不引发异常。

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