Programmer Group

Jump game, three questions in total. 55. Jump Game 1. topic 2. way of thinking This problem is to consider whether we can reach the last position. When we reach each subscript, we can maintain a maximum subscript value to determine whether we can reach the last subscript of the array. 3. code ...

I. Concepts of Generics Generics are a new feature in Java SE5. Generics are essentially type parameterized or parameterized types. Without creating new types, the types specified by generics can be used to control the specific restrictions on parameters. 2. Meaning of Generics General classes and methods can only use specific types: either bas ...

We combed before Laravel inversion of control and dependency injection In this article, we combine the Laravel framework to see how it is implemented. 1. Entry document <?php /** * Laravel - A PHP Framework For Web Artisans * * @package Laravel * @author Taylor Otwell <taylor@laravel.com> */ define('LARAVEL_START', ...

I. Preface WeChat public number development (1) WeChat access certification as developer WeChat public number development (2) message processing This article will implement Get access_token according to AppID and AppSecret Custom menu (create menu, query menu, delete menu) Some tips in wechat documents: access_token must be stored with at ...

outline For the principle of cluster, please refer to Redis design and Implementation - working principle of cluster , I won't go into details here. I introduced how to use redis trib toolset to install cluster a long time ago How to build and use Redis cluster In the past two days, I read the official documents and found a new way of installa ...

Recently, when spring data jpa is used to maintain many to many relationships between tables, a strange problem arises. When a new object is put into the entity class to maintain many to many relationship set, and then saved with jpa, the following exception will appear. org.springframework.dao.InvalidDataAccessApiUsageException: detached enti ...

In Java engineering projects, we often use the Mybatis framework to add, delete, query and modify the data in the database. Its principle is to encapsulate JDBC and optimize the connection of data sources. Let's review the process of JDBC operating database. JDBC operation database When JDBC operates the database, you need to specify the co ...

In computer programming, unit testing is a software testing method, which is used to test a single unit of source code, a collection of one or more computer program modules, and related control data, use process and operation process to determine whether they are suitable for use. In short, when we are doing unit tests, we only test one code un ...

Change from: https://www.jianshu.com/p/fc2d2dbd510b Principle introduction kerberos is mainly used for identity authentication in network communication, and its main feature is "complexity". So it's best to familiarize yourself with the principles of kerberos before entering the pit. Her ...

What is RocketMQ Alibaba message queuing version RocketMQ not only provides asynchronous decoupling and peak clipping and valley filling capabilities for distributed application systems, but also has the features of massive message accumulation, high throughput, reliable retry and other features required by Internet applications, as well as cha ...