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

How does one create a 'null' Robot object for a SnowRemovalRobot?

1. Call newNullRobot with SnowRemovalRobot.class as an argument

2. Instantiate SnowRemovalRobot with a null constructor

3. Directly call the NullRobotProxyHandler constructor passing SnowRemovalRobot.class

4. Use a static factory method in SnowRemovalRobot

The correct answer is: Call newNullRobot with SnowRemovalRobot.class as an argument

One can create a 'null' Robot object for a SnowRemovalRobot by calling the newNullRobot method and passing SnowRemovalRobot.class as an argument. This allows the creation of a null object specifically for the SnowRemovalRobot class. Option B is incorrect because a null constructor does not exist. Option C is incorrect because the NullRobotProxyHandler constructor is not designed to create a null object for a specific class. Option D is incorrect because using a static factory method in the SnowRemovalRobot class does not create a null object, but rather creates a new instance of the class.