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Event sources are objects that generate events, while listeners are objects that respond to those events. When an event occurs, the event source notifies its registered listeners, allowing them to execute specific actions in response. This relationship is fundamental in event-driven programming, enabling separation of concerns and promoting a reactive system where components can communicate asynchronously.
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What is the explanation for the swing delegation event model?
The Swing delegation event model in Java is based on the principle of event listeners and event sources. In this model, components (like buttons or text fields) act as event sources that generate events when user interactions occur. These events are then processed by registered listeners—objects that implement specific interfaces to handle particular types of events. This decouples the event generation from event handling, allowing for flexible and modular code design, as multiple listeners can respond to the same event source.
What is the difference between an event and an event listener?
Events are things that happen. Event listeners listen to these events and then do something in response.
What are listeners and how it is used in event handling?
Listeners are java classes which extend EventListener. Event handling is a process of notifying listeners of an event. For example if you click a button, the AWT thread will process the click and the button will notify any of it's relevant listeners of the event that just occurred, calling all the added ActionListeners actionPerformed functions. When events happen the system doesn't know who to tell about the actions. Telling everybody would be a waste. So listeners are required to be registered to the various Swing and AWT classes, as well as any custom listeners you may want to write, so as to know who should be told when something happens. Which is how the listener paradigm works thus implementing event handling (at least in Java).
When two or more objects are added as listeners for the same event which listener is invoked first to handle the event?
First to arrive at the event.
Relationship between relative frequency and probability of an event?
The relative frequency is an estimate of the probability of an event.
What is the relationship between the probability of a simple event and its complement?
If the probability of an event is p, then the complementary probability is 1-p.
What is the basis of a cause and effect relationship?
The basis of a cause and effect relationship is the idea that one event (the cause) leads to another event (the effect). This relationship implies that there is a direct and observable connection between a specific action or event and its consequences. It helps us understand the relationship between actions and outcomes in various scenarios.
What is the relationship between compressional wave amplitude and the intensity of a seismic event?
The relationship between compressional wave amplitude and the intensity of a seismic event is that the amplitude of compressional waves is directly related to the energy released during the seismic event. A higher amplitude indicates a stronger seismic event with greater intensity.
Definition of event handling in java?
When an application or a program keeps on monitoring and quickly responds to any action that occurs at the GUI interface ,like mouse movement, selecting an item in a list or entering a keyboard input and so on then such a scenario is termed as event handling. In java the events from the event sources are captured and they are sent to event listeners for respective actions to be taken.
What is the relationship between two or more events in which one event brings about?
The relationship between two or more events where one event brings about another is known as causation. In this context, the first event is referred to as the cause, while the subsequent event is the effect. This cause-and-effect relationship implies that changes in the cause directly influence or determine the occurrence of the effect. Understanding this relationship is crucial in fields like science, philosophy, and social sciences for analyzing how and why events happen.
What interface is extended by AWT event listeners?
The AWTEventListener interface implements the EventListener interface.
What is the relationship between two or more events in which one event brings about another?
Cause and Effect
