Question

Invoking _______ returns the first element in an ArrayList x.

A. ()
B. (0)
C. (1)
D. ()

Answer 1

To get the first element of an ArrayList in Java, invoke x.get(0). This is because ArrayLists in Java use zero-based indexing, where (0) is the correct option to access the first element.

Step-by-step explanation:

Invoking x.get(0) returns the first element in an ArrayList x. The correct option is B. (0). In Java, ArrayList indexing starts at 0, so to retrieve the first element of an ArrayList, you should pass 0 as the index to the get method. For instance, if you have an ArrayList called 'x' and you want to get the first element, you would use the code x.get(0). Remember that option C '(1)' would return the second element because of zero-based indexing.