} 1.4 类和接口的声明(Class and Interface Declarations) 当编写类和接口时，应该遵守以下格式规则： 在方法名与其参数列表之前的左括号“(”间不要有空格。
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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.
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.
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