Ace Java 2025: Rock Your 'Thinking in Java' Challenge!

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Within the SWT version of ColorBoxes, what causes the display to update after a color change?

redraw() method call

In the SWT version of ColorBoxes, calling the redraw() method is what causes the display to update after a color change. Option B, changing the RGB values directly, does not automatically cause the display to update and would require a redraw() call. Option C, calling the system's native paint method, is not a part of SWT and therefore would not be used to update the display. Option D, a call to Display.update(), is used to continuously update the display and is not specific to color changes.

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Changing the RGB values directly

Calling the system's native paint method

A call to Display.update()

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