The three objects of the event processing model: 1. Event source; the place where the event occurs is usually each component. 2. Events; encapsulate specific things that happen on interface components. 3. Event listener: Responsible for monitoring events that occur in event sources and responding accordingly to various events.

The operating environment of this tutorial: windows7 system, java10 version, Dell G3 computer.

Three types of objects in the event listening and processing model

1. Event Source: The place where the event occurs, usually each component, such as a button, window;

2. Event: Event encapsulates specific things that occur on interface components.

3. Event Listener: Responsible for monitoring events that occur in event sources and responding accordingly to various events.

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