ArrayList Methods Practice Test

Identify the error in this student database code and choose the best correction.

import java.util.ArrayList;

public class StudentDemo {

    public static void main(String[] args) {

        ArrayList<String> students = new ArrayList<String>();

        students.add("Mia");

        students.add("Noah");

        students.remove("0"); // intended to remove first student

        System.out.println(students.size());

    }

}

Which method would you use to replace a book title at a specific index in an ArrayList?

import java.util.ArrayList;

public class UpdateTitle {

    public static void main(String[] args) {

        ArrayList<String> books = new ArrayList<String>();

        books.add("OldTitle");

        // replace index 0 with "NewTitle"

    }

}