ArrayList Traversals Practice Test

What is the purpose of the loop in the provided code?

// Part A: Setup

ArrayList<Double> prices = new ArrayList<>();

prices.add(2.5);

prices.add(null);

prices.add(1.0);

// Part B: Sum values safely

double totalSum = 0.0;

for (Double price : prices) { // traverse list

    if (price != null) {

        totalSum += price; // add non-null values

    }

}

// Part C: Output

System.out.println(totalSum);

How does the code modify the ArrayList?

// Part A: Setup

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

scores.add(5);

scores.add(12);

scores.add(10);

// Part B: Conditional modification

for (int i = 0; i < scores.size(); i++) { // traverse by index

    if (scores.get(i) > 10) {

        scores.set(i, scores.get(i) * 2); // update element

    }

}

// Part C: Output

System.out.println(scores);