AP CSA Arrays and ArrayLists

Question 1

What is the index of the first element in a Java array?

Accepted Answer

0

Answer

1

Answer

-1

Answer

Depends on declaration

Question 2

Which method adds an element to the end of an ArrayList?

Accepted Answer

add()

Answer

append()

Answer

insert()

Answer

push()

Question 3

What is the length of an array declared as `int[] arr = new int[5];`?

Accepted Answer

5

Answer

4

Answer

0

Answer

1

Question 4

Which of the following correctly accesses the last element of an array `arr` of length n?

Accepted Answer

arr[n-1]

Answer

arr[n]

Answer

arr[length-1]

Answer

arr[last]

Question 5

What does `ArrayList list = new ArrayList<>();` create?

Accepted Answer

An empty ArrayList that holds Integer objects

Answer

An ArrayList pre-filled with zeros

Answer

An ArrayList of primitive ints

Answer

A fixed-size list of integers

Question 6

What exception is thrown when you access an array index that is out of bounds?

Accepted Answer

ArrayIndexOutOfBoundsException

Answer

NullPointerException

Answer

IllegalArgumentException

Answer

IndexOutOfRangeException