6 After add(0,"z"): [z,a,b,c]. set(2,"y"): [z,a,y,c]. indexOf("y")=2, size=4. 2+4 = 6.

Traversing ArrayLists

AP Computer Science A· difficulty 3/5

import java.util.ArrayList;
public static int run() {
    ArrayList<String> a = new ArrayList<>();
    a.add("a"); a.add("b"); a.add("c");
    a.add(0, "z");
    a.set(2, "y");
    return a.indexOf("y") + a.size();
}
// Call: System.out.println(run());

What is printed?

A
$6$
check_circle
B
$7$
C
$4$
D
$5$

Explanation

After add(0,"z"): [z,a,b,c]. set(2,"y"): [z,a,y,c]. indexOf("y")=2, size=4. 2+4 = 6.

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