理解接口的作用，掌握声明接口和类实现接口的方法。理解异常处理

机制的运行方式，掌握Java异常处理的基本方法，具备发现及处理程序错

误的能力，使应用程序具有稳定性和可靠性。-Understanding of the role of the interface, master declare interfaces and classes that implement an interface method. Understanding of exception-handling mechanisms operating mode to master the basic method of Java exception handling, and processing errors have found the ability to make an application with the stability and reliability.