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Java Event Handling

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Questions and Answers

What is the primary responsibility of the operating system in a graphical user interface?

To execute programs in response to user events

To generate events based on user input

To monitor the environment for events and pass them to running programs (correct)

To provide a standard set of event types for programs to use

What is the purpose of an event listener in Java?

To register with an event source and receive notifications when events occur (correct)

To provide a standard set of event types for programs to use

To encapsulate information about an event that has occurred

To generate events that an event source can listen for

What type of event is generated when a button is clicked in Java?

Mouse event

Action event (correct)

Key event

Window event

What is the role of an event source in Java?

To register event listeners and notify them when events occur Signup and view all the answers

How does a listener object receive information about an event that has occurred?

The event source passes the event object to the listener object Signup and view all the answers

How does a program register a listener object with an event source in Java?

By implementing the listener interface in a class and creating an instance of that class Signup and view all the answers

Which of the following statements is true about the `ButtonPanel` class?

It extends the <code>JPanel</code> class and implements the <code>ActionListener</code> interface. Signup and view all the answers

What is the purpose of the `addActionListener()` method call in the `ButtonPanel` constructor?

To register the <code>ButtonPanel</code> instance as a listener for button events. Signup and view all the answers

In the `actionPerformed()` method, what does the `getSource()` method return?

The reference to the <code>JButton</code> object that triggered the event. Signup and view all the answers

What is the purpose of the `repaint()` method call in the `actionPerformed()` method?

To redraw the panel with the new background color. Signup and view all the answers

In the `eventFrame` class, what is the purpose of the `add(new ButtonPanel())` statement?

To create a new instance of the <code>ButtonPanel</code> class and add it to the <code>JFrame</code>. Signup and view all the answers

What is the purpose of the `setDefaultCloseOperation(EXIT_ON_CLOSE)` method call in the `main()` method?

To exit the program when the <code>JFrame</code> is closed. Signup and view all the answers

Java Event Handling

Choose a study mode

Podcast

Questions and Answers

What is the primary responsibility of the operating system in a graphical user interface?

What is the purpose of an event listener in Java?

What type of event is generated when a button is clicked in Java?

What is the role of an event source in Java?

How does a listener object receive information about an event that has occurred?

How does a program register a listener object with an event source in Java?

Which of the following statements is true about the `ButtonPanel` class?

What is the purpose of the `addActionListener()` method call in the `ButtonPanel` constructor?

In the `actionPerformed()` method, what does the `getSource()` method return?

What is the purpose of the `repaint()` method call in the `actionPerformed()` method?

In the `eventFrame` class, what is the purpose of the `add(new ButtonPanel())` statement?

What is the purpose of the `setDefaultCloseOperation(EXIT_ON_CLOSE)` method call in the `main()` method?

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Java Event Handling

Choose a study mode

Podcast

Questions and Answers

What is the primary responsibility of the operating system in a graphical user interface?

What is the purpose of an event listener in Java?

What type of event is generated when a button is clicked in Java?

What is the role of an event source in Java?

How does a listener object receive information about an event that has occurred?

How does a program register a listener object with an event source in Java?

Which of the following statements is true about the ButtonPanel class?

What is the purpose of the addActionListener() method call in the ButtonPanel constructor?

In the actionPerformed() method, what does the getSource() method return?

What is the purpose of the repaint() method call in the actionPerformed() method?

In the eventFrame class, what is the purpose of the add(new ButtonPanel()) statement?

What is the purpose of the setDefaultCloseOperation(EXIT_ON_CLOSE) method call in the main() method?

More Like This

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Which of the following statements is true about the `ButtonPanel` class?

What is the purpose of the `addActionListener()` method call in the `ButtonPanel` constructor?

In the `actionPerformed()` method, what does the `getSource()` method return?

What is the purpose of the `repaint()` method call in the `actionPerformed()` method?

In the `eventFrame` class, what is the purpose of the `add(new ButtonPanel())` statement?

What is the purpose of the `setDefaultCloseOperation(EXIT_ON_CLOSE)` method call in the `main()` method?