This is an object that you attach to a widget, for example, a button. It listens for events that happen to that widget and contains code to take some action based on that event. For example, the listener for a button on a GUI will contain code to do the work associated with that button when the user presses the GUI button. In Java, listeners implement the public interface java.util.EventListener.

In the JDK, a class that receives and handles events.

a binding of such a handler to an event targeting some element in a document

a class that contains callback methods to process EZPDO events listed above

a class that is instantiated and registered with the container to handle specific servlet life cycle events

a class which implements an interface specified by the event-model

an entity that employs, registers, and unregisters the callback functions on its behalf

an object that is notified when an event occurs

an object that listens for an event to occur and then executes a given script based on what event it was

Listeners are used by various Q classes. The client code subclasses a particular listener, adds it to the Q object to subscribe to events on that interface and implements the required methods to handle the events. See also: KeyboardListener, ApplicationListener, MouseListener. P01, P02

An object to which has been assigned the task of responding to events in an event-driven program.