Discussion
What will be the output of the program?
import java.util.*;
public class Sample23
{
public static void main(String[] args)
{
List<String> roles = new ArrayList<String>();
Collections.addAll(roles, "admin", "editor", "viewer");
String previous = roles.set(1, "author");
System.out.println(
previous + " -> " + roles.get(1) + " size " + roles.size());
}
}
Answer: C
set replaces the element at the index and returns whatever was there before, so previous holds editor while position 1 now holds author. The size is unchanged at 3 because nothing was inserted. Returning the displaced value is what distinguishes set from the two-argument add, which shifts and grows the list.
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