Where can ActionListener be implemented?

Where can ActionListener be implemented?

The ActionListener interface is found in java. awt. event package. It has only one method: actionPerformed().

What does implements ActionListener do 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.

Which of the following methods should be overridden when implementing the ActionListener interface?

ActionListener interface contains only one method that is actionPerformed(ActionEvent ae). Therefore if you are implementing ActionListener interface then you have to override actionPerformed(ActionEvent ae) in your class.

How many methods are declared in the ActionListener interface?

one method
Because ActionListener has only one method, it has no corresponding adapter class. Called just after the user performs an action. Returns the string associated with this action. Most objects that can fire action events support a method called setActionCommand that lets you set this string.

How is an ActionListener defined in a class?

ActionListener is an interface (not a class) that contains a single method: public void actionPerformed (ActionEvent evt) ; A class that implements the interface must contain an actionPerformed () method. The ActionEvent parameter is an Event object that represents an event (a button click).

How to add an ActionListener to javatpoint?

We can also use the anonymous class to implement the ActionListener. It is the shorthand way, so you do not need to follow the 3 steps: tf.setText (“Welcome to Javatpoint.”); b.addActionListener (new ActionListener () { public void actionPerformed (ActionEvent e) { tf.setText (“Welcome to Javatpoint.”);

What is the interface for a button listener?

A button listener must implement the ActionListener interface. ActionListener is an interface (not a class) that contains a single method: public void actionPerformed( ActionEvent evt) ;

What is the public void for the ActionEvent parameter?

public void actionPerformed (ActionEvent evt) ; A class that implements the interface must contain an actionPerformed () method. The ActionEvent parameter is an Event object that represents an event (a button click). It contains information about the event.