Javaはオンライン試験システムのテストスコアとランキング統計を実装します

public class Student {
    private String name;
    private int studentId;
    
    public Student(String name, int studentId) {
        this.name = name;
        this.studentId = studentId;
    }
    
    // getter 和 setter 方法省略
    
    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", studentId=" + studentId +
                '}';
    }
}

public class Exam {
    private String subject;
    private List<ExamScore> scores;
    
    public Exam(String subject) {
        this.subject = subject;
        this.scores = new ArrayList<>();
    }
    
    public void addScore(ExamScore score) {
        scores.add(score);
    }
    
    // getter 和 setter 方法省略
    
    // 计算平均分方法
    public double calculateAverageScore() {
        double totalScore = 0;
        int count = 0;
        
        for (ExamScore score : scores) {
            totalScore += score.getScore();
            count++;
        }
        
        return totalScore / count;
    }
    
    @Override
    public String toString() {
        return "Exam{" +
                "subject='" + subject + ''' +
                ", scores=" + scores +
                '}';
    }
}

public class ExamScore {
    private Student student;
    private double score;
    
    public ExamScore(Student student, double score) {
        this.student = student;
        this.score = score;
    }
    
    // getter 和 setter 方法省略
    
    @Override
    public String toString() {
        return "ExamScore{" +
                "student=" + student +
                ", score=" + score +
                '}';
    }
}

public class ScoreStatistics {
    private List<ExamScore> scores;
    
    public ScoreStatistics(List<ExamScore> scores) {
        this.scores = scores;
    }
    
    public void printExamScores() {
        for (ExamScore score : scores) {
            System.out.println(score);
        }
    }
    
    public void printRanking() {
        Collections.sort(scores, Comparator.comparingDouble(ExamScore::getScore).reversed());
        
        int rank = 1;
        for (ExamScore score : scores) {
            System.out.println("Rank " + rank + ": " + score.getStudent().getName() + ", Score: " + score.getScore());
            rank++;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        // 初始化学生对象
        Student student1 = new Student("张三", 1001);
        Student student2 = new Student("李四", 1002);
        Student student3 = new Student("王五", 1003);
        
        // 初始化考试成绩对象
        ExamScore score1 = new ExamScore(student1, 80);
        ExamScore score2 = new ExamScore(student2, 90);
        ExamScore score3 = new ExamScore(student3, 85);
        
        // 初始化考试对象
        Exam exam = new Exam("数学");
        
        // 添加考试成绩到考试对象
        exam.addScore(score1);
        exam.addScore(score2);
        exam.addScore(score3);
        
        // 创建成绩统计对象
        List<ExamScore> scores = new ArrayList<>();
        scores.add(score1);
        scores.add(score2);
        scores.add(score3);
        ScoreStatistics statistics = new ScoreStatistics(scores);
        
        // 输出考试成绩和排名
        System.out.println("Exam Scores:");
        statistics.printExamScores();
        
        System.out.println();
        
        System.out.println("Exam Ranking:");
        statistics.printRanking();
    }
}

Exam Scores:
ExamScore{student=Student{name='张三', studentId=1001}, score=80.0}
ExamScore{student=Student{name='李四', studentId=1002}, score=90.0}
ExamScore{student=Student{name='王五', studentId=1003}, score=85.0}

Exam Ranking:
Rank 1: 李四, Score: 90.0
Rank 2: 王五, Score: 85.0
Rank 3: 张三, Score: 80.0