Question

You can create an instance variable that creates an object from a class that implements the listener interface. Since this class doesn't have a name, it's known as a/an ________________ class.

Answer 1

An instance variable that creates an object from a class implementing a listener interface without a name is known as an anonymous class, which is often used in Java for event listeners or callback functions.

Step-by-step explanation:

When you create an instance variable that creates an object from a class implementing a listener interface without a name, it's known as an anonymous class. An anonymous class in Java allows you to declare and instantiate a class at the same time. They are typically used for implementing event listeners or small callback functions. For example, in a graphical user interface (GUI) application, you might create an anonymous class to handle a button click event like this:

button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// handle button click
}
});

The ActionListener is an interface, and you're providing the implementation for its method inline, without giving a name to the class. Anonymous classes are useful in simplifying the code when the class implementation is very short.