persistent classes

• 1. 持久化类: Persistent Classes | Pojo
• 2. 持久化集合类: Persistent collections

• 1.实际上，代理类是持久化类的子类。
  The proxy class is an actual subclass of the persistent class.
  dict.yoduao.com
• 2.在JPA 2.0之前，这种语义区分是通过持久化类定义中的对应类级别注释来表示的。
  Before JPA 2.0, this semantic distinction was represented via corresponding class-level annotations in the persistent-class definition.
  dict.yoduao.com
• 3.然而，在我们使用ofy之前，我们需要在一个静态的初始化方法中注册持久化类，如清单2的Photo。
  Before we can use ofy, however, we need to register persistent classes in a static initializer like Photo in Listing 2.
  dict.yoduao.com

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