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

Disable ads (and more) with a membership for a one time $2.99 payment

Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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

NullRobot, NullRobotProxyHandler, Null, and Robot
Proxy, Method, and InvocationHandler
NRobot, Null, and Robot
NullRobot, NRobot, and Proxy

The correct answer is: 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.