FRQ-Homework

// CODE_RUNNER: Question 3: Array / ArrayList

public class Main {
    public static void main(String[] args) {

        Review[] testReviews = {
            new Review(4, "Good! Thx"),
            new Review(3, "OK site"),
            new Review(5, "Great!"),
            new Review(2, "Poor! Bad."),
            new Review(3, "")
        };

        ReviewAnalysis analysis = new ReviewAnalysis(testReviews);
        double avg = analysis.getAverageRating();

        System.out.println("Average Rating: " + avg);
        System.out.println("Expected: 3.4");
        System.out.println("Match: " + (Math.abs(avg - 3.4) < 0.001));
    }
}

class Review {
    private int rating;
    private String comment;

    public Review(int r, String c) {
        rating = r;
        comment = c;
    }

    public int getRating() {
        return rating;
    }

    public String getComment() {
        return comment;
    }
}

class ReviewAnalysis {
    private Review[] allReviews;

    public ReviewAnalysis(Review[] reviews) {
        allReviews = reviews;
    }

    public double getAverageRating() {
        int totalRating = 0;

        for (int index = 0; index < allReviews.length; index++) {
            int currentRating = allReviews[index].getRating();
            totalRating = totalRating + currentRating;
        }

        double result = (double) totalRating / allReviews.length;
        return result;
    }
}

Main.main(null);

// CODE_RUNNER: Question 3: Array / ArrayList

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {

        Review r1 = new Review(4, "Good! Thx");
        Review r2 = new Review(3, "OK site");
        Review r3 = new Review(5, "Great!");
        Review r4 = new Review(2, "Poor! Bad.");
        Review r5 = new Review(3, "");

        Review[] reviewArray = {r1, r2, r3, r4, r5};

        ReviewAnalysis analyzer = new ReviewAnalysis(reviewArray);

        System.out.println("=== Part A: getAverageRating() ===");
        double avg = analyzer.getAverageRating();
        System.out.println("Average Rating: " + avg);
        System.out.println("Expected: 3.4");
        System.out.println("Correct: " + (Math.abs(avg - 3.4) < 0.001));
        System.out.println();

        System.out.println("=== Part B: collectComments() ===");
        ArrayList<String> collected = analyzer.collectComments();

        System.out.println("Formatted Comments:");
        for (int i = 0; i < collected.size(); i++) {
            System.out.println("  " + collected.get(i));
        }

        System.out.println();
        System.out.println("Expected: 0-Good! Thx., 2-Great!, 3-Poor! Bad.");
        System.out.println("Total comments: " + collected.size());
    }
}

class Review {
    private int rating;
    private String comment;

    public Review(int r, String c) {
        rating = r;
        comment = c;
    }

    public int getRating() {
        return rating;
    }

    public String getComment() {
        return comment;
    }
}

class ReviewAnalysis {
    private Review[] allReviews;

    public ReviewAnalysis(Review[] reviews) {
        allReviews = reviews;
    }

    // Part A
    public double getAverageRating() {
        int total = 0;

        for (int index = 0; index < allReviews.length; index++) {
            total = total + allReviews[index].getRating();
        }

        return (double) total / allReviews.length;
    }

    // Part B
    public ArrayList<String> collectComments() {
        ArrayList<String> commentList = new ArrayList<String>();

        for (int pos = 0; pos < allReviews.length; pos++) {
            String text = allReviews[pos].getComment();

            if (text.indexOf("!") >= 0) {
                String entry = pos + "-" + text;

                char end = entry.charAt(entry.length() - 1);
                if (end != '.' && end != '!') {
                    entry = entry + ".";
                }

                commentList.add(entry);
            }
        }

        return commentList;
    }
}

Main.main(null);

Reflection on the Development Process

Skills and Concepts I Gained

• I learned how to organize information using classes so related data like ratings and comments are stored together.
• I learned how arrays can be used to hold multiple objects of the same type and how to access each object using a loop.
• I learned how methods can process data stored in an array and return a calculated result, such as the average of several ratings.
• I learned how to use a loop to go through every element in a collection and apply the same operation to each one.
• I learned how to work with ArrayList objects to store results that may change in size.
• I learned how to check whether a string contains a specific character using methods like indexOf.
• I learned how to manipulate strings, including adding extra characters when formatting the final output.
• I learned how to combine numbers and text into a single formatted string for display.

Challenges I Faced During the Assignment

• I struggled with remembering to call the correct accessor methods (getRating and getComment) instead of trying to access the variables directly.
• I initially forgot to cast the total rating to a double when calculating the average, which caused incorrect results.
• I had difficulty figuring out how to check whether a comment contained an exclamation mark.
• I struggled with formatting the comments correctly, especially adding a period only when the comment did not already end with punctuation.
• I made some mistakes with index positions when combining the index number with the comment text.
• I also had to debug small logic errors that caused the output to not match the expected format.