Questions and Answers
What is the primary responsibility of the operating system in a graphical user interface?
To monitor the environment for events and pass them to running programs
What is the purpose of an event listener in Java?
To register with an event source and receive notifications when events occur
What type of event is generated when a button is clicked in Java?
Action event
What is the role of an event source in Java?
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How does a listener object receive information about an event that has occurred?
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How does a program register a listener object with an event source in Java?
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Which of the following statements is true about the ButtonPanel
class?
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What is the purpose of the addActionListener()
method call in the ButtonPanel
constructor?
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In the actionPerformed()
method, what does the getSource()
method return?
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What is the purpose of the repaint()
method call in the actionPerformed()
method?
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In the eventFrame
class, what is the purpose of the add(new ButtonPanel())
statement?
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What is the purpose of the setDefaultCloseOperation(EXIT_ON_CLOSE)
method call in the main()
method?
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