Mastering Java: The Ultimate Quiz for 'Thinking in Java

Question: 1 / 510

Which classes or interfaces are essential to create a null proxy object as demonstrated?

NullRobot, NullRobotProxyHandler, Null, and Robot

Proxy, Method, and InvocationHandler

When creating a null proxy object, the essential classes and interfaces are Proxy, Method, and InvocationHandler.

Option A is incorrect because the classes NullRobot, NullRobotProxyHandler, Null, and Robot are not necessary to create a null proxy object.

Option C is also incorrect because it includes the non-existent class NRobot.

Option D is incorrect because it includes both NullRobot and NRobot which are not necessary for creating a null proxy object.

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NRobot, Null, and Robot

NullRobot, NRobot, and Proxy

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