例如，当你声明了类型为List的成员变量时，这个信息是在字节码的某个地方以某种元信息的方式保存的，尽管这个成员变量确实仅仅是List类型的。

So for instance, when you declare of field of type List, somewhere in the bytecode, this information is kept in the form of some meta-information, although this field is really just of type List.

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