AOP（Aspect-Oriented Programming，面向切面编程） 是 Java 和 Spring 中的重要概念，它通过将横切关注点从业务逻辑中分离，使代码...

Design a simple dating system like Tinder with the following features: Register a user with their gender, age, preferences, and interests. Find matching users according to their preferred gender, preferred age range, and common interests. Implement the Tinder class: Tinder() Initializes the object. void signup(int userId, int gender, int preferredGender, int age, int minPreferredAge, int maxPreferredAge, List<String> interests) Registers a user with the given attributes. List<Integer> getMatches(int userId) Returns the...

Java 的 注解（Annotation） 是一种用于元编程的工具，它为 Java 程序员提供了一种将元信息嵌入到代码中的方式。通过注解，开发者可以在编译时或运行...

Design a system like Facebook with the following features: A user can write a post. Two users can become friends with each other. Users can see all the posts written by their friends. Implement the Facebook class: Facebook() Initializes the object. void writePost(int userId, String postContent) The user with id userId writes a post with the content postContent. void addFriend(int user1, int user2) user1 and user2 become friends with each...

Design a system like Whatsapp with the following features: Send a message to a user. Create a group with some initial users. Add more users to a group. Send a message to a group. Get messages for a user. Implement the WhatsApp class: WhatsApp() Initializes the object. void sendMessage(int toUser, String message) Sends a personal message with the text message to the user with id: toUser. int createGroup(int[] initialUsers) Creates a new group that initially contains users whose ids are in the list initialUsers, and the group id is returned....

GitHub Pages 图床使用教程 GitHub Pages 可以作为图床使用，适合存储静态文件（如 .jpg、.png、.gif 格式）。 创建 GitHub 账户： 如果还没有账户，访问 GitHub 注册一个。 创...

定义 某段代码有大段的注释，这些注释之所以存在是因为代码很糟糕 代码注释错误，或者缺少必要的注释 影响 以注释掩盖了代码坏味道，或者没有正确的注释，...

定义 对于某个子类，它只想继承基类的部分函数和数据，不需要基类提供的全部内容， 这些不需要的内容就成为了子类的负担 影响 这种坏味道通常影响并不大，...