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Which XXX completes the code to increment the displayed token number when actionPerformed() is called?
a. public class TokenFrame extends JFrame implements ActionListener {
b. private JLabel tokenLabel;
c. private JTextField tokenField;
d. private JButton genButton;

Respuesta :

Martebi

The XXX that completes the code to increment the displayed token number when actionPerformed() is called option a. public class TokenFrame extends JFrame implements ActionListener {

Is ActionListener a functional interface?

In programming, Only one method, actionPerformed, is defined by an ActionListener interface (). Because it is a functional interface, there is a location where the code can be replaced with lambda expressions.

The interface used by action event listeners. The addActionListener method of the component is used to register an object produced with that class with the component. The class that is interested in processing an action event implements this interface.

Therefore, An implementation of the ActionListener interface must include the public void actionPerformed(ActionEvent evt) method. ActionListener is an interface, not a class, and it has just one method. An Event object that represents an event is used as the ActionEvent parameter (a button click).

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