小型通讯录管理程序设计的类的设计

一个小型通讯录管理程序可以由以下几个类构成：

1. Contact 类：表示一个联系人，包含联系人的姓名、电话号码、电子邮件地址等属性，以及操作这些属性的方法。

2. AddressBook 类：表示整个通讯录，包含多个 Contact 对象，以及操作这些对象的方法，如添加、删除、修改、查找等。

3. FileIO 类：表示文件读写操作，负责将通讯录保存到文件或从文件中读取通讯录。

4. ConsoleUI 类：表示控制台界面，负责与用户交互，接收用户输入并显示输出。

其中，Contact 类可以定义如下：

class Contact:
    def __init__(self, name, phone, email):
        self.name = name
        self.phone = phone
        self.email = email
    
    def __str__(self):
        return f"{self.name}\t{self.phone}\t{self.email}"
    
    def get_name(self):
        return self.name
    
    def set_name(self, name):
        self.name = name
        
    def get_phone(self):
        return self.phone
    
    def set_phone(self, phone):
        self.phone = phone
        
    def get_email(self):
        return self.email
    
    def set_email(self, email):
        self.email = email

AddressBook 类可以定义如下：

class AddressBook:
    def __init__(self):
        self.contacts = []
        
    def add_contact(self, contact):
        self.contacts.append(contact)
        
    def remove_contact(self, contact):
        self.contacts.remove(contact)
        
    def find_contact_by_name(self, name):
        for contact in self.contacts:
            if contact.get_name() == name:
                return contact
        return None
    
    def find_contact_by_phone(self, phone):
        for contact in self.contacts:
            if contact.get_phone() == phone:
                return contact
        return None
    
    def find_contact_by_email(self, email):
        for contact in self.contacts:
            if contact.get_email() == email:
                return contact
        return None
    
    def __str__(self):
        result = ""
        for contact in self.contacts:
            result += str(contact) + "\n"
        return result

FileIO 类可以定义如下：

class FileIO:
    @staticmethod
    def load_address_book(filename):
        address_book = AddressBook()
        with open(filename, "r") as f:
            lines = f.readlines()
            for line in lines:
                parts = line.strip().split("\t")
                name = parts[0]
                phone = parts[1]
                email = parts[2]
                contact = Contact(name, phone, email)
                address_book.add_contact(contact)
        return address_book
    
    @staticmethod
    def save_address_book(address_book, filename):
        with open(filename, "w") as f:
            for contact in address_book.contacts:
                f.write(str(contact) + "\n")

ConsoleUI 类可以定义如下：

class ConsoleUI:
    def __init__(self):
        self.address_book = None
        
    def print_menu(self):
        print("请选择操作：")
        print("1. 新建联系人")
        print("2. 删除联系人")
        print("3. 修改联系人")
        print("4. 查找联系人")
        print("5. 显示所有联系人")
        print("6. 保存并退出")
        
    def run(self):
        self.address_book = FileIO.load_address_book("address_book.txt")
        while True:
            self.print_menu()
            choice = input("请选择操作：")
            if choice == "1":
                name = input("请输入姓名：")
                phone = input("请输入电话号码：")
                email = input("请输入电子邮件地址：")
                contact = Contact(name, phone, email)
                self.address_book.add_contact(contact)
            elif choice == "2":
                name = input("请输入姓名：")
                contact = self.address_book.find_contact_by_name(name)
                if contact:
                    self.address_book.remove_contact(contact)
                else:
                    print("联系人不存在！")
            elif choice == "3":
                name = input("请输入姓名：")
                contact = self.address_book.find_contact_by_name(name)
                if contact:
                    phone = input("请输入电话号码：")
                    email = input("请输入电子邮件地址：")
                    contact.set_phone(phone)
                    contact.set_email(email)
                else:
                    print("联系人不存在！")
            elif choice == "4":
                keyword = input("请输入关键词：")
                found = False
                for contact in self.address_book.contacts:
                    if keyword in str(contact):
                        print(contact)
                        found = True
                if not found:
                    print("联系人不存在！")
            elif choice == "5":
                print(self.address_book)
            elif choice == "6":
                FileIO.save_address_book(self.address_book, "address_book.txt")
                break
            else:
                print("无效操作！")

以上就是一个简单的通讯录管理程序的类设计。可以根据需要进行修改和扩展。