创建完整大小应用程序的组织包、界面和类结构，即使这些文件的作用只是声明最初实现的类名称和接口。
Create the full-size application's organizational package, interface, and class structure, even if the files do nothing more than declare the class name and the interface it implements initially.
在编程时，可以将一些接口和类声明为final，这样就不能用它们产生子类。
In programming, you can declare some interfaces and classes final so that they are not subclassed.
使用引入(Introduction)，Aspect可以向类中添加新的方法和变量、声明一个类实现一个接口或将检查异常转换为未检查异常(unchecked exception)。
Using introduction, aspects can add new methods and variables to a class, declare that a class implements an interface, or convert checked to unchecked exceptions.
如果实现CustomService接口的类还声明实现JMXManageable接口，那么MBean的装入和激活在很大程度上将是自动的。
If the class that implements the CustomService interface also claims to implement the JMXManageable interface, then much of the loading and activating of your MBean will be automatic.
属性和方法必须在类接口上声明。
Properties and methods must be declared on the class interface.
委托和接口都允许类设计器分离类型声明和实现。
Both delegates and interfaces enable a class designer to separate type declarations and implementation.
返回一class对象的数组，映射该Class对象表示的类中作为成员声明的所有类和接口。
Returns an array of class objects reflecting all the classes and interfaces declared as members of the class represented by this class object.
返回一class对象的数组，映射该Class对象表示的类中作为成员声明的所有类和接口。
Returns an array of class objects reflecting all the classes and interfaces declared as members of the class represented by this class object.
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