Wrapper Classes Practice Test

Based on the example code, collections require objects, so Integer wraps primitive scores: ```java

ArrayList scores = new ArrayList<>();

Integer bonus = 4;

scores.add(bonus);

In the given program, an ArrayList stores score objects, so it uses Integer rather than primitive int.

import java.util.ArrayList;

public class ScoreTracker {

    public static void main(String[] args) {

        ArrayList<Integer> scores = new ArrayList<>();

        // Add scores using the Integer wrapper type

        scores.add(Integer.valueOf(30));

        scores.add(40); // autoboxing

        System.out.println(scores.get(0));

    }

}

Which of the following is a correct use of the Integer wrapper class in the code?