(24.05.03) 회차별 등급조회 구현

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// 수강생의 특정 과목 회차별 등급 조회
    private static void inquireRoundGradeBySubject() {
        String studentId = getStudentId();
        //아이디로 학생찾기
        Student resultStudent = studentStore.stream().filter((Student s) -> s.getStudentId().equals(studentId)).toList().get(0);

        /*조회할 과목 선택 후 회차별 등급 조회*/
        System.out.println("\n다음은 " + resultStudent.getStudentName() + " 학생의 수강 과목입니다.");
        System.out.printf("%-10s%-10s%-20s%n", "과목ID", "과목타입", "과목이름");
        System.out.println("----------------------------------");
        for (Subject subject : resultStudent.getEnrolledSubjects()) {
            String subjectType = subject.getSubjectType();
            String subjectName = subject.getSubjectName();
            String subjectId = subject.getSubjectId();
            System.out.printf("%-10s%-15s%-20s%n", subjectId, subjectType, subjectName);
        }

        /*입력한 과목 회차별 등급 조회*/
        System.out.print("\n조회할 과목ID 입력해주세요. :");
        String searchID = sc.next().toUpperCase();
        Subject resultSubject = subjectStore.stream().filter((Subject s) -> s.getSubjectId().equals(searchID)).toList().get(0);
        System.out.println("\n" + resultSubject.getSubjectName() + " 과목의 회차별 등급을 조회합니다...");
        List<Score> resultScore = scoreStore.stream().filter(s -> s.getStudent().equals(resultStudent) && s.getSubject().equals(resultSubject)).toList();
        if (!resultScore.isEmpty()) {
            System.out.printf("%-8s%-10s%n", "회차", "등급");
            System.out.println("------------");
            for (Score score : resultScore) {
                int round = score.getRound();
                char grade = score.getGrade();
                System.out.printf("%-10s%-10s%n", round, grade);
            }
        } else {
            System.out.println("점수가 등록되어 있지 않습니다.");
        }

        /*과목별 평균 등급을 조회*/
        System.out.print("\n과목별 평균 등급을 조회하시겠습니까? (yes 입력 시, 조회):");
        String input = sc.next();
        if (input.equals("yes")) {
            System.out.println("\n과목이름(과목타입)  :  평균등급");
            System.out.println("----------------------------------");
            for (Subject subject : resultStudent.getEnrolledSubjects()) {
                double average = 0; // 과목별 평균 점수
                String averageGrade = null; // 과목별 평균 등급
                List<Score> subjectScore = scoreStore.stream().filter(s -> s.getStudent().equals(resultStudent) && s.getSubject().equals(subject)).toList();

                for (Score score : subjectScore) {
                    average += score.getScore();
                }
                average /= subjectScore.size();

                switch (subject.getSubjectType()) {
                    case "MANDATORY":
                        if (average <= 100) {
                            averageGrade = "A";
                        }
                        if (average < 95) {
                            averageGrade = "B";
                        }
                        if (average < 90) {
                            averageGrade = "C";
                        }
                        if (average < 80) {
                            averageGrade = "D";
                        }
                        if (average < 70) {
                            averageGrade = "F";
                        }
                        if (average < 60) {
                            averageGrade = "N";
                        }
                        break;
                    case "CHOICE":
                        if (average <= 100) {
                            averageGrade = "A";
                        }
                        if (average < 90) {
                            averageGrade = "B";
                        }
                        if (average < 80) {
                            averageGrade = "C";
                        }
                        if (average < 70) {
                            averageGrade = "D";
                        }
                        if (average < 60) {
                            averageGrade = "F";
                        }
                        if (average < 50) {
                            averageGrade = "N";
                        }
                        break;
                }
                if (averageGrade == null) {
                    averageGrade = "점수 미등록";
                }
                System.out.println(subject.getSubjectName() + "(" + subject.getSubjectType() + ")  :  " + averageGrade);
            }
        }

        /*다시 메인으로 돌아가기 전 출력문구*/
        System.out.println("\n등급 조회 종료");
    }
...