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1. Mybaits plus project integration 1.1 explanation of modified cases /** * MP update operation * Note: change the name of id=354 to "six eared macaque" */ @Test public void updateUserById(){ User user = new User(354,"Six eared macaque",null,null); int rows = userMapper.updateById(user); ...

Pop (procedure oriented programming) is a process centered programming idea, and each step of the function is realized by itself. Object oriented programming (OOP) is an object-centered programming idea, which realizes specific functions by commanding objects. 1. Classes and objects Class is an abstraction of a class of things with commo ...

1, BackgroundThe Stream type is a new type after redis5. In this article, we use Spring boot data redis to consume the data in Redis Stream. Realize independent consumption and consumption group consumption.2, Integration steps1. Import jar package<dependencies> <dependency> <groupId>org.springframework.boot</groupId& ...

Note: the note is about the implementation of page replacement algorithm by fengsigaoju boss( (35 messages) java implements the page replacement algorithm (OPT,FIFO,LRU) _fengsigaoju's blog - CSDN blog _pagereplacement algorithm code java )Learning, invasion and deletion. I have been learning JAVA for one month. If there are any deficiencies, ...

reflex 1. Class loader 1.1 loading of class When a program wants to use a class, if the class has not been loaded into memory, the system will initialize the class through three steps: loading, connecting and initialization. load This is to read the class file into memory and create a class object for it. When any Class is used, the sy ...

Life cycle of bean sCircular DependencyLevel 3 Cachefactorybena and benafactoeyDifferences between appliaationcontext and beanfactoryioc container   bean - Data Structure - map - Level 3 Cache IOC container context.getBean() - When to call How to create a bean - factory, reflection - configuration file (xml) in a container Introduction t ...

1 Overview Spring Cloud is based on Spring Boot, which provides several components to help enterprises build micro-service systems. The main functions it provides are: Service Registry/Service Registration/Service Call/Load Balancing/Circuit Breaker, etc. Generally, it uses the existing open source software, which is based on the concept of Spr ...

Overview of JDBC JDBC (Java Database Connectivity) is a set of interface to connect database provided by Java language. The implementation of interface is called database driver in JDBC and is provided by major database manufacturers. The reason for this is that the user doesn't need to care about how the underlying implementation is imple ...

Servlet&HTTP&Request Notes 1. Architecture of Servlet Servlet - Interface GenericServlet - Abstract Class HttpServlet - Abstract Class GenericServlet: Default empty implementation of the rest of the Servlet interface, using only the service() method as an abstraction When defining a Servlet class in the future, you can inherit t ...

1. Java multithreading related concepts 1. Process It is the second execution of the program and the unique unit of the system for resource allocation and scheduling. Each process has its own memory space and system resources 2. Thread Multiple tasks can be executed in the same process. Each task can be regarded as one thread. Each p ...