Developing Algorithms Using ArrayLists

AP Computer Science A· difficulty 3/5

ArrayList<Integer> a = new ArrayList<>();
a.add(1);
a.add(2);
a.add(3);
ArrayList<Integer> b = new ArrayList<>();
for (int i = a.size() - 1; i >= 0; i--) b.add(a.get(i));
System.out.println(b);

What is printed?

A
$[]$
B
$[1, 2, 3]$
C
$[3, 2, 1]$
check_circle
D
$[3, 2, 1, 0]$

Explanation

Iterating from the last index to 0 and appending to b reverses the list.

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