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In ordinary usage, an event is a state change at an instant in time. In the vernacular of programming, there are two type of events. In this chapter, you learn about events associated with a window, such as mouse clicks and key presses. In Chapter 49, you learn about events associated with variable-value changes.
The word event also refers to an instance of the
EventObject class, or to a subclass of that class. Such an
instance describes a state change at an instant in time. That is, an event
(a Java class instance) describes a event (a state change at an instant
of time).