Given the partial ArrayList class declaration below, select an expression to complete the empty method, which is designed to return true if the list contains no elements.
A)elements.length == 0
B)elements.currentSize == 0
C)elements[0] == null
D)currentSize == 0

Question

Given the partial ArrayList class declaration below, select an expression to complete the empty method, which is designed to return true if the list contains no elements.  
A)elements.length == 0 
B)elements.currentSize == 0 
C)elements[0] == null 
D)currentSize == 0

Quizplus · Accepted Answer

The variable "currentSize" keeps track of the number of elements currently in the list. Therefore, if the currentSize is 0, the list contains no elements, and the method should return true. The other options may not accurately indicate if the list contains no elements.

Given the Partial ArrayList Class Declaration Below, Select an Expression