Mastering Java 2025 – 400 Free Practice Questions to Pass the 'Thinking in Java' Exam

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Question: 1 / 510

What is the purpose of the redraw() method in the SineDraw class?

To reset the slider value

To draw a rectangle

To update the UI representation of the sine wave

The redraw() method in the SineDraw class updates the UI representation of the sine wave. This means that the method is responsible for dynamically adjusting the visual display of the sine wave as the slider value is changed. Option A is incorrect because the redraw() method does not reset the slider value, it only updates the UI. Option B is incorrect because the method is not responsible for drawing a rectangle. Option D is incorrect because the method does not clear the canvas, it only updates the UI. In conclusion, the purpose of the redraw() method is to update the UI representation of the sine wave, making option C the correct answer.

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To clear the canvas

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