A process or function in a computer programme that waits for an event to occur is known as an event listener. A user clicking or moving the mouse, pushing a key on the keyboard, disc I/O, network activity, or an internal timer or interrupt are all examples of events.
The event listener can be a callback function or an object that implements EventListener and has a handleEvent() method that acts as a callback function.
Event listeners are the interfaces that are in charge of handling events. Although Java has a number of Event listener classes, we'll just cover the ones that are most commonly used. Every event listener method takes a single argument in the form of an object that is a subclass of the EventObject class.
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