Events - 描述所发生事件的对象

　　Java中有很多不同类型的事件类，用来描述不同

　　类型的用户动作



 事件源 - 产生事件的组件



 事件处理 - 一个接收事件对象并处理用户交互的方法-Events- the events described in the Java object, there are many different types of event class, to describe different types of user actions 　event source- the component that generated the event 　event handling- an event object to receive and process user interaction methods