Mini Project Set 4: Student Score Report

Name: ________

Time: 40 minutes

Write a Java program that stores five students as objects in an ArrayList, then prints a report card summary. Use a HashMap to count how many students earned each letter grade.

Learning Goals

• Create a class with private fields, a constructor, and getter methods.
• Store objects in an ArrayList.
• Count occurrences with a HashMap.
• Search a list and remember the index of a best value.
• Combine loops, conditionals, strings, and formatted output.

Requirements

• Create a Student class with these parts:
• private fields String name and int score
• a constructor that receives both values
• getName() returns the name
• getScore() returns the score
• getGrade() returns the letter grade for the score:
  • 90-100: "A"
  • 80-89: "B"
  • 70-79: "C"
  • 60-69: "D"
  • below 60: "F"
• In main, build this ArrayList<Student> with exactly these five objects:

ArrayList<Student> students = new ArrayList<>();
students.add(new Student("Mina", 88));
students.add(new Student("Jin", 72));
students.add(new Student("Hana", 95));
students.add(new Student("Leo", 95));
students.add(new Student("Sara", 54));

• Use one loop over students to find:
• the total of all scores
• the index of the first student with the highest score
• the number of passing students (score 60 or higher)
• While looping, update a HashMap<String, Integer> named gradeCounts so each letter grade maps to the number of students who earned it.
• Print one line for each student in this format:

Mina: 88 (B)

• Then print the summary. After that, print the grade counts in the order A, B, C, D, F. Only print a grade that appears at least once. The average must have two decimal places.
• When two students have the same highest score, keep the first one. Do not replace the best index for an equal score.

Expected Output

Mina: 88 (B)
Jin: 72 (C)
Hana: 95 (A)
Leo: 95 (A)
Sara: 54 (F)
Average score: 80.80
Top student: Hana
Passing students: 4
A grades: 2
B grades: 1
C grades: 1
F grades: 1

Starter Code

import java.util.ArrayList;
import java.util.HashMap;

class Student {
    // TODO: Add private fields, a constructor, getName(), getScore(), and getGrade().
}

public class Main {
    public static void main(String[] args) {
        ArrayList<Student> students = new ArrayList<>();
        students.add(new Student("Mina", 88));
        students.add(new Student("Jin", 72));
        students.add(new Student("Hana", 95));
        students.add(new Student("Leo", 95));
        students.add(new Student("Sara", 54));

        HashMap<String, Integer> gradeCounts = new HashMap<>();

        // TODO: Initialize summary variables.
        // TODO: Use one loop to print each student, update the summary values,
        //       and count the letter grades in gradeCounts.
        // TODO: Print the summary.
        // TODO: Print the grade counts in the order A, B, C, D, F.
    }
}

Before You Submit

• Every Student object stores its own name and score; use this. in the constructor.
• Use students.size() instead of a hard-coded limit.
• Start bestIndex at 0 because the first student is initially the best candidate.
• Use > instead of >= when comparing a score to the current highest score.
• Before counting a grade, check whether it is already in gradeCounts with containsKey.
• Iterate the list with an index so you can remember the best student's index.