下面的示例演示如何在类中实现接口事件。
The following example shows how to implement interface events in a class.
这个例子解决了一个常见问题：如何将更改中的行为附加到用户接口事件？
This example solves a common problem: how do you attach changing behavior to a user interface event?
而对于引起状态迁移的接口事件，则可以通过对象类中的成员函数来完成，成员函数体的主要功能就是实现状态迁移中发生的一系列活动。
The member functions of an object are the interface events that trigger state transitions, and actions associated with state transitions constitute the body of the member functions.
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