Test question analysis and answering functions of online examination system written in Java

public abstract class Question {
    protected String content; // 题目内容

    public abstract boolean isCorrect(String answer); // 判断答案是否正确
    public abstract String getAnswer(); // 获取正确答案
    public abstract String getAnalysis(); // 获取题目解析
}

public class SingleChoiceQuestion extends Question {
    private List<String> options; // 选项
    private int correctOptionIndex; // 正确选项的索引

    @Override
    public boolean isCorrect(String answer) {
        int selectedOptionIndex = Integer.parseInt(answer);
        return selectedOptionIndex == correctOptionIndex;
    }

    // 具体实现略
}

public class FillInBlankQuestion extends Question {
    private List<String> correctAnswers; // 正确答案

    @Override
    public boolean isCorrect(String answer) {
        return correctAnswers.contains(answer);
    }

    // 具体实现略
}

// 其他类型题目的实现类...

public class ExamAnalyzer {
    private List<Question> questions; // 题目列表

    public ExamAnalyzer(List<Question> questions) {
        this.questions = questions;
    }

    public List<QuestionResult> analyzeAnswers(List<String> answers) {
        List<QuestionResult> results = new ArrayList<>();

        for (int i = 0; i < questions.size(); i++) {
            Question question = questions.get(i);
            String answer = answers.get(i);
            QuestionResult result = new QuestionResult();

            result.setContent(question.getContent());
            result.setSubmittedAnswer(answer);
            result.setCorrectAnswer(question.getCorrectAnswer());
            result.setCorrect(question.isCorrect(answer));
            result.setAnalysis(question.getAnalysis());

            results.add(result);
        }

        return results;
    }
}

public class QuestionResult {
    private String content; // 题目内容
    private String submittedAnswer; // 用户提交的答案
    private String correctAnswer; // 正确答案
    private Boolean isCorrect; // 答案是否正确
    private String analysis; // 题目解析

    // 省略getter和setter方法
}

public class ExamDemo {
    public static void main(String[] args) {
        List<Question> questions = new ArrayList<>();
        // 此处省略向questions添加题目的过程

        ExamAnalyzer analyzer = new ExamAnalyzer(questions);

        List<String> studentAnswers = new ArrayList<>();
        // 此处省略向studentAnswers添加学生答案的过程

        List<QuestionResult> results = analyzer.analyzeAnswers(studentAnswers);

        for (QuestionResult result : results) {
            System.out.println("题目：" + result.getContent());
            System.out.println("用户答案：" + result.getSubmittedAnswer());
            System.out.println("正确答案：" + result.getCorrectAnswer());
            System.out.println("答案是否正确：" + result.isCorrect());
            System.out.println("题目解析：" + result.getAnalysis());
            System.out.println();
        }
    }
}