如何利用Java建立線上考試系統的試題難度篩選

class Question {
    String content;
    String answer;
    String type;
    double difficultyLevel;

    // ... 省略其他属性和方法
}

class Student {
    String name;
    double abilityLevel;

    // ... 省略其他属性和方法
}

class ExamSystem {
    List<Question> questionBank;
    
    public List<Question> filterQuestions(Student student) {
        List<Question> filteredQuestions = new ArrayList<>();
        for (Question question : questionBank) {
            if (question.type.equals("选择题")) {
                double difficultyDifference = Math.abs(student.abilityLevel - question.difficultyLevel);
                if (difficultyDifference < 0.1) {
                    filteredQuestions.add(question);
                }
            } else if (question.type.equals("填空题")) {
                // ... 根据不同类型的题目难度评估标准进行筛选
            }
        }
        return filteredQuestions;
    }

    // ... 省略其他方法
}

public class Main {
    public static void main(String[] args) {
        ExamSystem examSystem = new ExamSystem();
        
        // 初始化试题库
        examSystem.questionBank = new ArrayList<>();
        Question question1 = new Question();
        question1.content = "2 + 2 = ?";
        question1.answer = "4";
        question1.type = "选择题";
        question1.difficultyLevel = 0.5;
        examSystem.questionBank.add(question1);

        Question question2 = new Question();
        question2.content = "Java是一种编程语言。";
        question2.answer = "是";
        question2.type = "判断题";
        question2.difficultyLevel = 0.3;
        examSystem.questionBank.add(question2);

        // 模拟学生信息
        Student student = new Student();
        student.name = "张三";
        student.abilityLevel = 0.4;

        // 筛选试题
        List<Question> filteredQuestions = examSystem.filterQuestions(student);

        // 输出筛选后的试题
        for (Question question : filteredQuestions) {
            System.out.println(question.content);
        }
    }
}