你作为Java后端工程师请完成以下代码一级下面有二级二级下面有三级以此类推用递归调用

public Menu(String name, List<Menu> subMenus) {
    this.name = name;
    this.subMenus = subMenus;
}

public void printMenu() {
    printMenu(0);
}

private void printMenu(int level) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < level; i++) {
        sb.append("-");
    }
    sb.append(name);
    System.out.println(sb.toString());

    if (subMenus != null) {
        for (Menu subMenu : subMenus) {
            subMenu.printMenu(level + 1);
        }
    }
}

}

// 测试代码 public static void main(String[] args) { Menu menu3_1 = new Menu("menu3_1", null); Menu menu3_2 = new Menu("menu3_2", null); List

subMenus2 = new ArrayList<>(); subMenus2.add(menu3_1); subMenus2.add(menu3_2); Menu menu2 = new Menu("menu2", subMenus2);

Menu menu1 = new Menu("menu1", Arrays.asList(menu2));
menu1.printMenu();

}