Java develops test paper answer analysis function in online examination system

public class ExamPaper {
    private String paperId;
    private String paperName;
    private List<Question> questions;
    
    // Getters and setters
}

public class Question {
    private String questionId;
    private String questionContent;
    private List<String> options;
    private String correctAnswer;
    
    // Getters and setters
}

public class Answer {
    private String questionId;
    private String studentAnswer;
    
    // Getters and setters
}

public class ExamResult {
    private ExamPaper examPaper;
    private List<Answer> studentAnswers;
    private double score;
    
    // Getters and setters
}

public class ExamParser {
    public ExamResult parseExam(ExamPaper examPaper, List<Answer> studentAnswers) {
        ExamResult examResult = new ExamResult();
        examResult.setExamPaper(examPaper);
        examResult.setStudentAnswers(studentAnswers);
        
        double totalScore = 0.0;
        
        for (Answer answer : studentAnswers) {
            Question question = findQuestionById(examPaper, answer.getQuestionId());
            
            if (question != null && answer.getStudentAnswer().equals(question.getCorrectAnswer())) {
                totalScore += 1.0; // 正确回答加1分
            }
        }
        
        examResult.setScore(totalScore);
        return examResult;
    }
    
    private Question findQuestionById(ExamPaper examPaper, String questionId) {
        for (Question question : examPaper.getQuestions()) {
            if (question.getQuestionId().equals(questionId)) {
                return question;
            }
        }
        return null;
    }
}

public class ExamUI {
    public void showExamResult(ExamResult examResult) {
        System.out.println("试卷名称：" + examResult.getExamPaper().getPaperName());
        System.out.println("得分：" + examResult.getScore());
        
        System.out.println("错题解析：");
        for (Answer answer : examResult.getStudentAnswers()) {
            Question question = findQuestionById(examResult.getExamPaper(), answer.getQuestionId());
            
            if (question != null && !answer.getStudentAnswer().equals(question.getCorrectAnswer())) {
                System.out.println("题目：" + question.getQuestionContent());
                System.out.println("你的答案：" + answer.getStudentAnswer());
                System.out.println("正确答案：" + question.getCorrectAnswer());
                System.out.println("----------------------");
            }
        }
    }
    
    private Question findQuestionById(ExamPaper examPaper, String questionId) {
        for (Question question : examPaper.getQuestions()) {
            if (question.getQuestionId().equals(questionId)) {
                return question;
            }
        }
        return null;
    }
}