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.

In the provided code, how is a new Robot object created that behaves as a null object?

Using standard Java reflection
By directly calling constructors
By using a Proxy combined with an InvocationHandler
Through method overloading in the Robot interface

The correct answer is: By using a Proxy combined with an InvocationHandler

Using standard Java reflection (A) and directly calling constructors (B) are both methods commonly used to create new objects in Java, but neither of these methods would result in a null object. A Proxy combined with an InvocationHandler is a design pattern that allows for the creation of a null object, where all method calls on the object will have no effect or return null. Method overloading in the Robot interface (D) would not result in the creation of a new object at all.