javafx listeners

What does a listener do in JavaFX?
A listener is like an event handler, it gets called when the value of the biding property changes.
A listener lets you perform more complex logic than simple value updating, whereas a property binding simply updates the value of the property to whatever it is binding to whenever it changes.
A change listener is similar to a property change listener.
A change listener is registered on an object — typically a component, but it could be another object, like a model — and the listener is notified when the object has changed.

What is ActionListener in JavaFX?

Interface ActionListener
The listener interface for receiving action events.
The class that is interested in processing an action event implements this interface, and the object created with that class is registered with a component, using the component's addActionListener method.

What is a listener in Java?

An event listener in Java is designed to process some kind of event — it "listens" for an event, such as a user's mouse click or a key press, and then it responds accordingly.
An event listener must be connected to an event object that defines the event.

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