What is difference between action and ActionListener in JSF?
What is difference between action and ActionListener in JSF?
An actionlistener method compared to an action method does not return a String. Instead it returns void. It is basically identical to the action method but instead it just executes the code after an action event (button click or link click) but a navigation is not needed.
What is ActionListener method in Java?
ActionListener in Java is a class that is responsible for handling all action events such as when the user clicks on a component. Mostly, action listeners are used for JButtons. An ActionListener can be used by the implements keyword to the class definition.
What is ActionListener used for?
To determine where the user clicked on the screen, Java provides an interface called “ActionListener” through which we determine where the user clicked and generates an event to perform several tasks, like calculation, print a value, print a specific character, etcetera using a button.
How do I add an ActionListener?
To write an Action Listener, follow the steps given below:
- Declare an event handler class and specify that the class either implements an ActionListener interface or extends a class that implements an ActionListener interface.
- Register an instance of the event handler class as a listener on one or more components.
What is the difference between action and actionListener?
What is the difference between action and actionListener on a component? From the “core JavaServerFaces” book: “In a nutshell, actions are designed for business logic and participate in navigation handling, whereas action listeners typically perform user interface logic and do not participate in navigation handling.”
Is ActionListener an interface Java?
The ActionListener interface is found in java. awt. event package. It has only one method: actionPerformed().
Which of these methods is ActionListener interface?
The class which processes the ActionEvent should implement this interface. The object of that class must be registered with a component. The object can be registered using the addActionListener() method….Interface methods.
| S.N. | Method & Description |
|---|---|
| 1 | void actionPerformed(ActionEvent e) Invoked when an action occurs. |
What is event handling in Java?
Event Handling is the mechanism that controls the event and decides what should happen if an event occurs. This mechanism have the code which is known as event handler that is executed when an event occurs. Java Uses the Delegation Event Model to handle the events.
How do you implement an ActionListener interface in Java?
If you implement the ActionListener class, you need to follow 3 steps:
- Implement the ActionListener interface in the class: public class ActionListenerExample Implements ActionListener.
- Register the component with the Listener: component.
- Override the actionPerformed() method:
Why AWT ActionListener interface is implemented in Java?
The class which processes the ActionEvent should implement this interface. The object of that class must be registered with a component. The object can be registered using the addActionListener() method. When the action event occurs, that object’s actionPerformed method is invoked.
