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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.

An event listener is a JavaScript procedure that waits for an event to happen. A user clicking the mouse or pushing a key on the keyboard is a simple example of an event.

In web design, event listeners are one of the most commonly used JavaScript structures. They enable us to add interactive functionality to HTML elements by "listening" to events on the page, such as when a user clicks a button, presses a key, or when an element loads.

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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