You wish to implement a callback method for an object created from a system class that you cannot change. What approach does the textbook recommend to accomplish this?
A) Create a new class that mimics the system class.
B) Extend the system class.
C) Use an inner class in the interface.
D) Use a helper class that implements the callback method.

Question

Quizplus · Accepted Answer

Using a helper class that implements the callback method allows you to add functionality without modifying the original system class, which is a common approach when dealing with classes you cannot change.

You Wish to Implement a Callback Method for an Object