The JVM records this signature information when loading a class and makes it available at run time using reflection.

JVM 在装载类时记录这个签名信息，并在运行时通过反射使它可用。

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Selected method: Shows details, including the number of times that the selected method is called, the class and package information, and the time taken by this method.

Selected method: 显示方法的细节信息，包括选择的方法被调用的时间、类和包的信息、以及时间消耗。

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Reflection gives you run-time access to a variety of class information.

反射使您能够运行时接入广泛的类信息。

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For example, for Stanford University a device could eventually show you a 3D map of the campus with real-time traffic information, information about your lecture room and the class there, information about the subject there, such as biology in 3D, and so on.

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This approach gives students the ability to use in-class time to apply their newfound information and to complete assignments.

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