请利用java语言修改以下代码以实现中文和英文的转换：package OneProject;import javautilArrayList;import javautilList;import javautilResourceBundle;import javautilScanner;public class OnlineTrainingHub static int score = 0;

package OneProject;

import java.util.ArrayList; import java.util.List; import java.util.ResourceBundle; import java.util.Scanner;

public class OnlineTrainingHub {

static int score = 0; // 用于记录用户的得分
static Scanner scanner = new Scanner(System.in);
static ResourceBundle bundle;

// 创建问题列表
static List<Question> questionList = createQuestionList();

public static void main(String[] args) {
    System.out.println("请选择语言：");
    System.out.println("1.中文 2.英文");
    int languageChoice = scanner.nextInt();
    if (languageChoice == 1) {
        bundle = ResourceBundle.getBundle("OneProject.i18n.Messages_zh_CN");
    } else if (languageChoice == 2) {
        bundle = ResourceBundle.getBundle("OneProject.i18n.Messages_en_US");
    }

    System.out.println(bundle.getString("welcome"));

    // 进入身份选择页面
    int roleChoice = showRoleChoicePage();
    if (roleChoice == 1) {
        // 进入管理员主页
        int adminChoice;
        do {
            adminChoice = showAdminMainPage();
            switch (adminChoice) {
                case 1:
                    addQuestion();
                    break;
                case 2:
                    viewQuestions();
                    break;
                case 3:
                     int roleChoice1 = showRoleChoicePage();
                     if(roleChoice1==2) {
                        // 进入用户页面
                         int userChoice;
                         do {
                             userChoice = showUserMainPage();
                             switch (userChoice) {
                                 case 1:
                                     register();
                                     break;
                                 case 2:
                                     login();
                                     break;
                                 case 3:
                                     break;
                                 default:
                                     System.out.println(bundle.getString("invalidChoice"));
                             }
                         } while (userChoice != 3);
                     } else {
                         System.out.println(bundle.getString("invalidChoice"));
                     }
                    break;
                case 4:
                    break;
                default:
                    System.out.println(bundle.getString("invalidChoice"));
            }
        } while (adminChoice != 4);
    } else if (roleChoice == 2) {
        // 进入用户页面
        int userChoice;
        do {
            userChoice = showUserMainPage();
            switch (userChoice) {
                case 1:
                    register();
                    break;
                case 2:
                    login();
                    break;
                case 3:
                    break;
                default:
                    System.out.println(bundle.getString("invalidChoice"));
            }
        } while (userChoice != 3);
    } else {
        System.out.println(bundle.getString("invalidChoice"));
    }

}

// 创建问题列表
public static List<Question> createQuestionList() {
    List<Question> questionList = new ArrayList<>();
    questionList.add(new Question("Which is the largest continent in the world?", "Asia", "Europe", "Africa", "North America", "A"));
    questionList.add(new Question("What is the capital city of Australia?", "Sydney", "Melbourne", "Canberra", "Brisbane", "C"));
    questionList.add(new Question("What is the name of the longest river in Africa?", "Nile", "Congo", "Zambezi", "Niger", "A"));
    questionList.add(new Question("Who is the author of the Harry Potter series?", "J.K. Rowling", "Stephenie Meyer", "George R.R. Martin", "J.R.R. Tolkien", "A"));
    questionList.add(new Question("What is the name of the highest mountain in the world?", "K2", "Mount Everest", "Makalu", "Lhotse", "B"));
    return questionList;
}

// 显示身份选择页面
public static int showRoleChoicePage() {
    System.out.println(bundle.getString("selectRole"));
    System.out.println("1. " + bundle.getString("admin"));
    System.out.println("2. " + bundle.getString("user"));
    int roleChoice = scanner.nextInt();
    return roleChoice;
}

// 显示管理员主页
public static int showAdminMainPage() {
    System.out.println(bundle.getString("adminMain"));
    System.out.println("1. " + bundle.getString("addQuestion"));
    System.out.println("2. " + bundle.getString("viewQuestions"));
    System.out.println("3. " + bundle.getString("switchToUser"));
    System.out.println("4. " + bundle.getString("exit"));
    int adminChoice = scanner.nextInt();
    return adminChoice;
}

// 添加问题
public static void addQuestion() {
    System.out.println(bundle.getString("addQuestion"));
    System.out.print(bundle.getString("enterQuestion"));
    String question = scanner.next();
    System.out.print(bundle.getString("optionA"));
    String optionA = scanner.next();
    System.out.print(bundle.getString("optionB"));
    String optionB = scanner.next();
    System.out.print(bundle.getString("optionC"));
    String optionC = scanner.next();
    System.out.print(bundle.getString("optionD"));
    String optionD = scanner.next();
    System.out.print(bundle.getString("correctAnswer"));
    String correctAnswer = scanner.next().toUpperCase();
    questionList.add(new Question(question, optionA, optionB, optionC, optionD, correctAnswer));
    System.out.println(bundle.getString("questionAdded"));
}

// 查看问题列表
public static void viewQuestions() {
    System.out.println(bundle.getString("viewQuestions"));
    for (int i = 0; i < questionList.size(); i++) {
        System.out.println((i + 1) + ". " + questionList.get(i));
    }
}

// 显示用户主页
public static int showUserMainPage() {
    System.out.println(bundle.getString("userMain"));
    System.out.println("1. " + bundle.getString("register"));
    System.out.println("2. " + bundle.getString("login"));
    System.out.println("3. " + bundle.getString("exit"));
    int userChoice = scanner.nextInt();
    return userChoice;
}

// 用户注册
public static void register() {
    System.out.println(bundle.getString("register"));
    System.out.print(bundle.getString("enterUsername"));
    String username = scanner.next();
    System.out.print(bundle.getString("enterPassword"));
    String password = scanner.next();
    User user = new User(username, password);
    if (UserDatabase.addUser(user)) {
        System.out.println(bundle.getString("registrationSuccess"));
    } else {
        System.out.println(bundle.getString("registrationFail"));
    }
}

// 用户登录
public static void login() {
    System.out.println(bundle.getString("login"));
    System.out.print(bundle.getString("enterUsername"));
    String username = scanner.next();
    System.out.print(bundle.getString("enterPassword"));
    String password = scanner.next();
    if (UserDatabase.authenticateUser(username, password)) {
        System.out.println(bundle.getString("loginSuccess"));
        takeQuiz();
    } else {
        System.out.println(bundle.getString("loginFail"));
    }
}

// 参加测验
public static void takeQuiz() {
    score = 0;
    for (int i = 0; i < questionList.size(); i++) {
        System.out.println((i + 1) + ". " + questionList.get(i).getQuestion());
        System.out.println(bundle.getString("optionA") + ": " + questionList.get(i).getOptionA());
        System.out.println(bundle.getString("optionB") + ": " + questionList.get(i).getOptionB());
        System.out.println(bundle.getString("optionC") + ": " + questionList.get(i).getOptionC());
        System.out.println(bundle.getString("optionD") + ": " + questionList.get(i).getOptionD());
        System.out.print(bundle.getString("answer"));
        String answer = scanner.next().toUpperCase();
        if (answer.equals(questionList.get(i).getCorrectAnswer())) {
            score++;
            System.out.println(bundle.getString("correctAnswer"));
        } else {
            System.out.println(bundle.getString("wrongAnswer"));
        }
    }
    System.out.println(bundle.getString("score") + ": " + score);
}