AOP make bytecode changes normal, without requiring understanding of the class file format.
AOP常常会要修改字节码，但又完全不需要理解class文件的格式。
As I covered in the last column, signatures are an item added to the class file format by generics; only references to generic types have signatures.
正如我在前一期中介绍的，签名是泛型添加到类文件格式中的项目；只有对泛型的引用才有签名。
The ButterflyFactory class reads this configuration file format and ACTS as a factory for Butterfly objects (see Listing 9).
ButterflyFactory类读取该配置文件的格式，并充当Butterfly对象的工厂类(参见清单9)。
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