Java中，数据类型分为基本数据类型（或叫做原生类、内置类型）和引用数据类型。原生类是指基本数据类型。
显微镜下可见的有单细胞原生类寄生虫，例如阿米巴和孢子虫，真菌及细菌，这些均能感染动物及植物。
Microscopic parasites include single-celled protozoans such as amoebas and sporozoa, fungi, and bacteria, which can infect animals and plants.
TypeDescription 类只是个抽象基类，其中定义了处理三种类型的方法：原生类型、数组和类实例。
The TypeDescription class is just an abstract base class with methods defined for dealing with three kinds of types: primitives, arrays, and instances of classes.
清单2的代码使用内部的PrimitiveTypeDescription和arraytypedescription类直接处理原生类型和数组类型。
The Listing 2 code handles primitive and array types directly, using the inner PrimitiveTypeDescription and ArrayTypeDescription classes.
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