Question

Which interface supports actionPerformed0? a. ActionListener b. ListSelectionListener c. AdjustmentListener d. DocumentListener e. None of the above

Short answer

The interface that supports actionPerformed is ActionListener (a).

Step-by-step solution

Understand the Question

Identify which of the given interfaces supports the actionPerformed method.

List the Interfaces

The interfaces provided are: ActionListener, ListSelectionListener, AdjustmentListener, DocumentListener, and None of the above.

Review Each Interface

Examine each interface to determine if it has an actionPerformed method.

ActionListener Interface

The ActionListener interface contains the actionPerformed method that is called when an action occurs.

Verify Other Interfaces

The ListSelectionListener, AdjustmentListener, and DocumentListener interfaces do not have an actionPerformed method.

Confirm the Right Answer

The interface that supports the actionPerformed method is ActionListener (option a).

Key concepts

Java Interfaces

In Java, an interface is like a blueprint for classes. It allows you to specify what methods a class should implement, without necessarily providing the method implementations itself. This separation of what the class should do and how it should do it enhances flexibility and modularity in your code.
Interfaces can include:

• Method signatures
• Constants

When a class 'implements' an interface, it pledges to define all the methods declared within that interface. This is especially useful for creating standardized code structures and ensuring a certain level of functionality across different classes.
Some examples of commonly used interfaces in Java include Comparable, Runnable, and ActionListener.

ActionListener Interface

The ActionListener interface is a special type of interface in Java that is used for handling action events. An action event occurs when an action is performed, e.g., clicking a button.
The key method in the ActionListener interface is:
void actionPerformed(ActionEvent e);
When a class implements the ActionListener interface, it must provide an implementation for this method. This method will be invoked whenever the associated action is triggered.
Consider an example:

Button button = new Button(															

Event Handling in Java

Event handling is a critical part of interactive applications. Java provides a robust event handling mechanism to make applications responsive to user actions. Here's how event handling works in Java:

• An event is generated when the user interacts with a GUI component.
• This event is sent to one or more event listeners.
• The event listeners have methods that are called when the event occurs.

< Actions like clicking a button or selecting an item create events. These events can be handled using specific listener interfaces.
To handle an event, you usually follow these steps:

1. Create an event listener class or an anonymous class.
2. Implement the required methods from the listener interface.
3. Register the listener with the event source (like a button).

Here is a simple example:

public class MyClass implements ActionListener {
    JButton button = new JButton(