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

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What output is produced when invoking operations on the proxied null object for SnowRemovalRobot?

  1. A list of operations performed by SnowRemovalRobot

  2. A NotSupportedException

  3. An empty list

  4. Detailed logging of each method call

The correct answer is: An empty list

A & D incorrect because they do not return anything and would just add an additional step. B is incorrect because even though the null object pattern throws a NotSupportedException, since it is a proxy, it would return the same output as the original SnowRemovalRobot which is an empty list.

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