Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Which method in the SineWave class listens for slider adjustments?

  1. public void adjustSlider()

  2. public void widgetSelected(SelectionEvent event)

  3. private void updateSines(int newValue)

  4. void createContents(Composite parent)

The correct answer is: public void widgetSelected(SelectionEvent event)

The method public void widgetSelected(SelectionEvent event) listens for slider adjustments in the SineWave class. This is because the SelectionEvent class represents events that occur due to user interaction with a user interface widget, such as a slider. Therefore, this method is the most appropriate option for listening to slider adjustments in the SineWave class. Options A and D are incorrect because they do not pertain to listening for slider adjustments in any way. Option C is also incorrect because it is a private method, meaning it cannot be accessed outside of the SineWave class, and it does not have the necessary parameters to listen for slider adjustments.

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