A method int size( )in a linked list class returns the number of elements stored in the list by executing the single statement return count;For this to work correctly,
A) count must be a static variable in the class,initialized to 0,incremented by each add method,and decremented by each remove method
B) count must be an instance variable in the class,initialized to 0,incremented by each add method,and decremented by each remove method
C) count must be a local variable in each add and remove method: the add methods must increment count,and the remove methods must decrement count.
D) It is not possible for size to just return the count value: the size method must set count to 0 and then increment count once for each element in the list.

Question

Quizplus · Accepted Answer

Count should be an instance variable in the class and initialized to 0. It should be incremented by each add method and decremented by each remove method. This is because count should keep track of the number of elements in the list across different methods, and it should be specific to each instance of the linked list class. Using a static variable (option A) would mean that count would be shared across all instances of the class and using a local variable (option C) would mean that count would be reset to 0 every time an add/remove method is called. Option D is not necessary as count can simply keep track of the number of elements without resetting to 0 before each call to size().

A Method Int Size( )In a Linked List Class Returns