198 a and b reference the same list. Both get(0) = 99. Sum = 198.

Traversing ArrayLists

AP Computer Science A· difficulty 4/5

import java.util.ArrayList;
public static int run() {
    ArrayList<Integer> a = new ArrayList<>();
    for (int i = 1; i <= 5; i++) a.add(i);
    ArrayList<Integer> b = a;
    b.set(0, 99);
    return a.get(0) + b.get(0);
}
// Call: System.out.println(run());

What is printed?

A
$2$
B
$99$
C
$198$
check_circle
D
$100$

Explanation

a and b reference the same list. Both get(0) = 99. Sum = 198.

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