[Z, X, W] [X]; [X,Y]; add(0,Z) - [Z,X,Y]; add(2,W) - [Z,X,W,Y]; remove("Y") - [Z,X,W].

Traversing ArrayLists

AP Computer Science A· difficulty 4/5

import java.util.ArrayList;
public static String run() {
    ArrayList<String> a = new ArrayList<>();
    a.add("X");
    a.add("Y");
    a.add(0, "Z");
    a.add(2, "W");
    a.remove("Y");
    return a.toString();
}
// Call: System.out.println(run());

What is printed?

A
$[Z, W, X]$
B
$[X, W, Y]$
C
$[Z, X, W]$
check_circle
D
$[Z, X, W, Y]$

Explanation

[X]; [X,Y]; add(0,Z) -> [Z,X,Y]; add(2,W) -> [Z,X,W,Y]; remove("Y") -> [Z,X,W].

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