使用Java实现在线考试系统的考试进度监控功能

public class ExamProgressMonitor {
    private int totalTime; // 考试总时间
    private int remainingTime; // 剩余考试时间
    private int completedQuestions; // 已完成题目数量
    private int totalQuestions; // 题目总量
    private int currentQuestion; // 当前所在题目

    // 构造方法初始化监控数据
    public ExamProgressMonitor(int totalTime, int totalQuestions) {
        this.totalTime = totalTime;
        this.remainingTime = totalTime;
        this.totalQuestions = totalQuestions;
        this.completedQuestions = 0;
        this.currentQuestion = 1;
    }

    // 更新考试进度
    public void updateProgress(int completedQuestions) {
        this.completedQuestions = completedQuestions;
        this.currentQuestion++;
        this.remainingTime = totalTime - (this.currentQuestion - 1) * (totalTime / totalQuestions);
    }

    // 获取剩余时间
    public int getRemainingTime() {
        return remainingTime;
    }

    // 获取已完成题目数量
    public int getCompletedQuestions() {
        return completedQuestions;
    }

    // 获取当前所在题目
    public int getCurrentQuestion() {
        return currentQuestion;
    }

    // 进入下一题
    public void nextQuestion() {
        this.currentQuestion++;
    }

    // 返回上一题
    public void previousQuestion() {
        this.currentQuestion--;
    }
}

public class OnlineExamSystem {
    private ExamProgressMonitor monitor; // 考试进度监控对象

    public void startExam(int totalTime, int totalQuestions) {
        monitor = new ExamProgressMonitor(totalTime, totalQuestions);
        // 启动考试界面和计时器等
        // ...
    }

    public void saveAnswer(int currentQuestion) {
        // 保存当前题目答案
        // ...
        monitor.updateProgress(currentQuestion);
    }

    public void showProgress() {
        int remainingTime = monitor.getRemainingTime();
        int completedQuestions = monitor.getCompletedQuestions();
        int currentQuestion = monitor.getCurrentQuestion();

        System.out.println("考试进度：");
        System.out.println("已完成题目数量：" + completedQuestions);
        System.out.println("当前所在题目：" + currentQuestion);
        System.out.println("剩余时间：" + remainingTime + " 分钟");
    }

    public void nextQuestion() {
        monitor.nextQuestion();
        // 显示下一题
        // ...
    }

    public void previousQuestion() {
        monitor.previousQuestion();
        // 显示上一题
        // ...
    }

    public static void main(String[] args) {
        OnlineExamSystem examSystem = new OnlineExamSystem();
        examSystem.startExam(90, 30); // 假设考试总时间为90分钟，题目数量为30
        examSystem.showProgress();
        examSystem.saveAnswer(1);
        examSystem.nextQuestion();
        examSystem.showProgress();
        examSystem.saveAnswer(2);
        examSystem.nextQuestion();
        examSystem.showProgress();
        // ...
    }
}