Wrapper Classes · AP Computer Science A

AP Computer Science A Quiz

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In the given program, an ArrayList stores score objects, so it uses Integer wrapper types instead of primitive int.

import java.util.ArrayList;

public class ScoreTracker {
    public static void main(String[] args) {
        ArrayList<Integer> scores = new ArrayList<>();
        scores.add(100);
        scores.add(50);
        int diff = scores.get(0) - scores.get(1); // unboxing
        System.out.println(diff);
    }
}

What is the purpose of using wrapper classes in this scenario?

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