Developing Algorithms Using ArrayLists

AP Computer Science A· difficulty 2/5

ArrayList<Integer> a = new ArrayList<>();
a.add(1);
a.add(2);
a.add(3);
ArrayList<Integer> b = new ArrayList<>();
for (int x : a) b.add(x * 2);
System.out.println(b);

What is printed?

A
$[2, 4, 6]$
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B
$[1, 2, 3]$
C
$[1, 4, 9]$
D
$[]$

Explanation

Each element of a is doubled and added to b: 1 <em> 2=2, 2 </em> 2=4, 3*2=6.

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