It is common for certain classes to keep track of how many times certain events have occurred over the life of an object.This is done using
A)A private instance variable within the class.
B)A local variable within a mutator method.
C)A notification event to a helper class.
D)An array of objects.

Question

Quizplus · Accepted Answer

Keeping track of the number of times certain events have occurred over the life of an object requires persistent storage of the count value. The best way to achieve this is by using a private instance variable within the class. This variable can be incremented every time the event occurs, and its value can be accessed by any method within the object. Using a local variable within a mutator method or a notification event to a helper class would not provide persistent storage and would result in the count being reset every time the method is called. Using an array of objects may be suitable for more complex scenarios where different types of events need to be tracked separately, but for a simple count, an instance variable is sufficient.

It Is Common for Certain Classes to Keep Track of How