Java는 온라인 시험 시스템에서 시험지 공유 및 제작 도구를 구현합니다.

public class Question {
    private String title;   // 试题题目
    private List<String> options;   // 试题选项
    private char answer;   // 试题答案

    public Question(String title, List<String> options, char answer) {
        this.title = title;
        this.options = options;
        this.answer = answer;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public List<String> getOptions() {
        return options;
    }

    public void setOptions(List<String> options) {
        this.options = options;
    }

    public char getAnswer() {
        return answer;
    }

    public void setAnswer(char answer) {
        this.answer = answer;
    }
}

public class ExamPaper {
    private List<Question> questions;   // 试卷包含的试题列表

    public ExamPaper() {
        questions = new ArrayList<>();
    }

    public void addQuestion(Question question) {
        questions.add(question);
    }

    public void removeQuestion(int index) {
        questions.remove(index);
    }

    public List<Question> getQuestions() {
        return questions;
    }

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

public class ExamTools {
    private List<Question> questionBank;   // 题库

    public ExamTools() {
        questionBank = new ArrayList<>();
    }

    public void addQuestion(Question question) {
        questionBank.add(question);
    }

    public void removeQuestion(int index) {
        questionBank.remove(index);
    }

    public ExamPaper generateExamPaper(int num) {
        ExamPaper examPaper = new ExamPaper();
        Random random = new Random();
        int totalNum = questionBank.size();
        if (num > totalNum) {
            num = totalNum;
        }
        Set<Integer> indexSet = new HashSet<>();
        while (indexSet.size() < num) {
            indexSet.add(random.nextInt(totalNum));
        }
        for (int index : indexSet) {
            examPaper.addQuestion(questionBank.get(index));
        }
        return examPaper;
    }
    
    public void editExamPaper(ExamPaper examPaper, int index, Question question) {
        examPaper.getQuestions().set(index, question);
    }
    
    public void deleteQuestion(ExamPaper examPaper, int index) {
        examPaper.removeQuestion(index);
    }
    
    public static void main(String[] args) {
        ExamTools examTools = new ExamTools();
        // 添加题目到题库
        Question question1 = new Question("1 + 1 = ?", Arrays.asList("A. 1", "B. 2", "C. 3", "D. 4"), 'B');
        Question question2 = new Question("2 + 2 = ?", Arrays.asList("A. 1", "B. 2", "C. 3", "D. 4"), 'D');
        examTools.addQuestion(question1);
        examTools.addQuestion(question2);
        
        // 生成试卷
        ExamPaper examPaper = examTools.generateExamPaper(2);
        System.out.println("试卷:");
        for (int i = 0; i < examPaper.getQuestions().size(); i++) {
            System.out.println("题目" + (i + 1) + ": " + examPaper.getQuestions().get(i).getTitle());
            System.out.println("选项: " + examPaper.getQuestions().get(i).getOptions());
            System.out.println("答案: " + examPaper.getQuestions().get(i).getAnswer());
            System.out.println();
        }
        
        // 编辑试卷
        Question newQuestion = new Question("3 + 3 = ?", Arrays.asList("A. 5", "B. 6", "C. 7", "D. 8"), 'B');
        examTools.editExamPaper(examPaper, 1, newQuestion);
        examTools.deleteQuestion(examPaper, 0);
        
        System.out.println("修改后的试卷:");
        for (int i = 0; i < examPaper.getQuestions().size(); i++) {
            System.out.println("题目" + (i + 1) + ": " + examPaper.getQuestions().get(i).getTitle());
            System.out.println("选项: " + examPaper.getQuestions().get(i).getOptions());
            System.out.println("答案: " + examPaper.getQuestions().get(i).getAnswer());
            System.out.println();
        }
    }
}