You Wish to Implement a Callback Method for an Object

question 23

Multiple Choice

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.

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Definitions:

Vandalism

The deliberate destruction or damage of public or private property.

Social Loafing

A group dynamic where individual contributions towards a goal diminish in comparison to efforts made when working alone.

Exert

To apply or bring to bear a force, influence, or quality, typically with effort.

Common Goal

A shared aim or objective by a group of people, which often motivates collective action toward its achievement.