我如何继续实现子菜单？Java终端菜单

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

public class TerminalMenu {
    private static List<MenuOption> menuOptions = new ArrayList<>();

    public static void main(String[] args) {
        initializeMenu();

        while (true) {
            displayMenu();
            int choice = getUserChoice();

            if (choice >= 1 && choice <= menuOptions.size()) {
                MenuOption selectedOption = menuOptions.get(choice - 1);
                if (selectedOption.hasSubMenu()) {
                    handleSubMenu(selectedOption.getSubMenu());
                } else {
                    System.out.println("You selected: " + selectedOption.getName());
                    // 执行选中菜单的操作
                }
            } else {
                System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    private static void initializeMenu() {
        // 初始化菜单选项
        MenuOption option1 = new MenuOption("Option 1");
        MenuOption option2 = new MenuOption("Option 2");
        MenuOption option3 = new MenuOption("Option 3");

        // 添加子菜单选项
        MenuOption subOption1 = new MenuOption("Sub Option 1");
        MenuOption subOption2 = new MenuOption("Sub Option 2");
        option3.addSubMenuOption(subOption1);
        option3.addSubMenuOption(subOption2);

        // 将选项添加到菜单列表
        menuOptions.add(option1);
        menuOptions.add(option2);
        menuOptions.add(option3);
    }

    private static void displayMenu() {
        System.out.println("Menu:");
        for (int i = 0; i < menuOptions.size(); i++) {
            System.out.println((i + 1) + ". " + menuOptions.get(i).getName());
        }
        System.out.println("Enter your choice:");
    }

    private static int getUserChoice() {
        Scanner scanner = new Scanner(System.in);
        return scanner.nextInt();
    }

    private static void handleSubMenu(List<MenuOption> subMenuOptions) {
        while (true) {
            displaySubMenu(subMenuOptions);
            int choice = getUserChoice();

            if (choice >= 1 && choice <= subMenuOptions.size()) {
                MenuOption selectedOption = subMenuOptions.get(choice - 1);
                if (selectedOption.hasSubMenu()) {
                    handleSubMenu(selectedOption.getSubMenu());
                } else {
                    System.out.println("You selected: " + selectedOption.getName());
                    // 执行选中菜单的操作
                }
            } else {
                System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    private static void displaySubMenu(List<MenuOption> subMenuOptions) {
        System.out.println("Sub Menu:");
        for (int i = 0; i < subMenuOptions.size(); i++) {
            System.out.println((i + 1) + ". " + subMenuOptions.get(i).getName());
        }
        System.out.println("Enter your choice:");
    }
}

class MenuOption {
    private String name;
    private List<MenuOption> subMenuOptions;

    public MenuOption(String name) {
        this.name = name;
        this.subMenuOptions = new ArrayList<>();
    }

    public String getName() {
        return name;
    }

    public void addSubMenuOption(MenuOption subMenuOption) {
        subMenuOptions.add(subMenuOption);
    }

    public List<MenuOption> getSubMenu() {
        return subMenuOptions;
    }

    public boolean hasSubMenu() {
        return !subMenuOptions.isEmpty();
    }
}