"Effective Java"精读之类和接口
1. 尽量减少类和成员的可访问性 类和成员的可访问性应根据实际需求进行设置。将它们的可访问性限制为最小化可以有效减少系统的复杂度并提高安全性。 总结...
"Effective Java"精读之所有对象通用的方法
1. 遵守重写 equals 方法时的通用契约 equals 方法在 Java 中是一个非常重要的函数，它用于比较对象的相等性。在重写 equals 方法时，需要遵守其通用契约：对称性、反射性、传...
"Effective Java"精读之泛型
1. 不要使用原始类型 原始类型无法充分利用泛型的类型安全性和可读性，因此应避免使用原始类型。始终使用参数化类型，以确保类型检查的正确性。 总结： 使...
"Effective Java"精读之创建和销毁对象
1. 考虑使用构造器代替可变参数的工厂方法 在面对多个构造参数时，工厂方法提供了一种灵活的选择，但若可变参数的数量和类型太多时，会使得代码变得难以...
Design Uber
Implement a Cab Booking Application (like Uber) which facilitates: Addition of new cabs to the system. Updating the trips of various customers. Finding the nearest cabs to a location. Design the Uber class: Uber() Initializes the Uber object with 0 cabs and 0 running trips. void addCab(int cabX, int cabY) Adds a cab located at point (cabX, cabY) to the system. Note that multiple cabs can be at the same...
Encode and Decode TinyURL
TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems/design-tinyurl and it returns a short URL such as http://tinyurl.com/4e9iAk. Design a class to encode a URL and decode a tiny URL. There is no restriction on how your encode/decode algorithm should work. You just need to ensure that a URL can be encoded to a tiny URL and the tiny URL can be decoded to the original URL....
Design Twitter
Design a simplified version of Twitter where users can post tweets, follow/unfollow another user, and is able to see the 10 most recent tweets in the user’s news feed. Implement the Twitter class: Twitter() Initializes your twitter object. void postTweet(int userId, int tweetId) Composes a new tweet with ID tweetId by the user userId. Each call to this function will be made with a unique tweetId. List<Integer> getNewsFeed(int userId) Retrieves...
面向切面编程 (AOP)
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...