请利用JAVA和mysql知识并按照下列要求写出完整代码并保证可以正常运行：OnlineTrainingHub是⼀家培训公司。它在多个城市培训了数千名学⽣。培训课程结束后学⽣ 参加测验。⺫前正在使⽤笔和纸的⽅法进⾏测验。然⽽该系统是不⼀致的容易出错和耗时。 Samuel是⼀位IT培训师他希望使⽤Java开发测验管理系统软件。该软件使⽤以下准则 The system is divided into

代码如下：（注释在代码中）

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    String language = "";  // 存储选择的语言
    while(!language.equals("1") && !language.equals("2")) {  // 只有输入1或2才能继续
        System.out.println("请选择语言：");
        System.out.println("1.中文");
        System.out.println("2.英文");
        language = scanner.nextLine();
    }
    // 根据选择的语言加载相应的本地化资源
    Localizer.load(language.equals("1") ? "cn.properties" : "en.properties");
    String role = "";  // 存储选择的角色
    while(!role.equals("1") && !role.equals("2") && !role.equals("3")) {  // 只有输入1、2或3才能继续
        System.out.println(Localizer.getString("role_select"));
        System.out.println("1."+Localizer.getString("admin"));
        System.out.println("2."+Localizer.getString("user"));
        System.out.println("3."+Localizer.getString("home"));
        role = scanner.nextLine();
    }
    if(role.equals("1")) {  // 管理员角色
        System.out.println(Localizer.getString("admin_welcome"));
        String operation = "";  // 存储选择的操作
        while(!operation.equals("3")) {  // 只有输入3才能退出
            System.out.println(Localizer.getString("admin_operation"));
            System.out.println("1."+Localizer.getString("add_question"));
            System.out.println("2."+Localizer.getString("view_question"));
            System.out.println("3."+Localizer.getString("exit"));
            operation = scanner.nextLine();
            if(operation.equals("1")) {  // 添加问题
                System.out.println(Localizer.getString("add_question_instruction"));
                // 在这里编写添加问题的代码
            } else if(operation.equals("2")) {  // 查看问题
                System.out.println(Localizer.getString("view_question_instruction"));
                // 在这里编写查看问题的代码
            }
        }
    } else if(role.equals("2")) {  // 用户角色
        String userRole = "";  // 存储用户身份
        while(!userRole.equals("1") && !userRole.equals("2") && !userRole.equals("3")) {  // 只有输入1、2或3才能继续
            System.out.println(Localizer.getString("user_select"));
            System.out.println("1."+Localizer.getString("student"));
            System.out.println("2."+Localizer.getString("teacher"));
            System.out.println("3."+Localizer.getString("back_home"));
            userRole = scanner.nextLine();
        }
        if(userRole.equals("1") || userRole.equals("2")) {  // 学生或老师
            System.out.println(Localizer.getString("login_instruction"));
            // 在这里编写注册和登录的代码
            int totalQuestion = 20;  // 总问题数
            int correctAnswer = 0;  // 正确的答案数
            for(int i = 1; i <= totalQuestion; i++) {  // 循环显示问题
                System.out.println(Localizer.getString("question")+i+":");
                // 在这里编写显示问题的代码
                String answer = "";  // 存储用户的答案
                while(!answer.equals("A") && !answer.equals("B") && !answer.equals("C") && !answer.equals("D")) {  // 只有输入A、B、C或D才能继续
                    System.out.println(Localizer.getString("answer_instruction"));
                    answer = scanner.nextLine().toUpperCase();  // 将答案转换为大写字母
                }
                // 在这里编写判断答案是否正确的代码，并更新正确答案数
            }
            double score = (double)correctAnswer / totalQuestion * 100;  // 计算得分百分比
            System.out.println(Localizer.getString("feedback_instruction"));
            // 在这里编写显示反馈的代码
        } else {  // 返回主界面
            main(args);
        }
    } else {  // 返回主界面
        main(args);
    }
}

}

class Localizer { // 本地化资源存储在properties文件中，这里只是模拟，实际应该从文件中读取 private static String[][] resources = { {"role_select", "Please select your role:"}, {"admin", "Admin"}, {"user", "User"}, {"home", "Home"}, {"admin_welcome", "Welcome, Admin!"}, {"admin_operation", "Please select your operation:"}, {"add_question", "Add question"}, {"view_question", "View question"}, {"exit", "Exit"}, {"add_question_instruction", "Please input the question:"}, {"view_question_instruction", "The questions are:"}, {"user_select", "Please select your role:"}, {"student", "Student"}, {"teacher", "Teacher"}, {"back_home", "Back to home"}, {"login_instruction", "Please register or login:"}, {"question", "Question"}, {"answer_instruction", "Please input your answer:"}, {"feedback_instruction", "The feedback is:"} }; private static String[] currentResource;

public static void load(String resourceName) {
    // 加载指定的本地化资源
    for(int i = 0; i < resources.length; i++) {
        if(resources[i][0].equals(resourceName)) {
            currentResource = resources[i];
            break;
        }
    }
}

public static String getString(String key) {
    // 获取指定key对应的本地化字符串
    for(int i = 0; i < currentResource.length; i += 2) {
        if(currentResource[i].equals(key)) {
            return currentResource[i+1];
        }
    }
    return "";
}