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@Bean s that Autowired can inject The source code of this article is based on spring-framework-5.3.10.Source location: org springframework. beans. factory. support. DefaultListableBeanFactory. findAutowireCandidates(String, Class<?>, DependencyDescriptor)This article focuses on how @ Autowired can select those beans for dependency inject ...

Article catalogue 1. Axios post request 1.1 INTRODUCTION cases 1.1.1 front end JS1.1.2 post request parameter description1.1.3 AxiosController call 1.2 syntax description of common request types1.3 put request test 1.3.1 edit front-end JS1.3.2 editing AxiosController 1.4 cross domain description 1.4.1 homology strategy1.4.2 w ...

Source code analysis of ArrayList capacity expansion mechanism First, correct a problem here. I found that when many blogs introduce the parameterless construction of ArrayList calls, the initial capacity is 10. In fact, there is a problem here. The parameterless construction is actually called, and the initial capacity is 0. Look at the sourc ...

Hashcode & HashMap perturbation function, initialization capacity, load factor, expansion element splitting 1. Why does hashcode use 31 as a multiplier? String. The hashCode method of class is as follows: public int hashCode() { int h = hash; if (h == 0 && value.lengt > 0) { char[] val = value; for (int ...

introduce Singleton pattern is the most commonly used and simplest design pattern. The main use scenario is on various tool classes in program development. Its function is to ensure that there is only one instance of a class in the whole program. example We generally divide the single case mode into hungry man single case mode and lazy man m ...

Introduction to Apollo Apollo (Apollo) is a distributed configuration center developed by Ctrip framework department. It can centrally manage the configuration of different application environments and different clusters. After the configuration is modified, it can be pushed to the application end in real time. It also has standardized per ...

JAVA learning-02-mr. Han Shunping Detailed explanation of JAVA process control - including exercises Branch control Single branch /* Basic grammar if (Conditional expression){ if Statement block } */ int a = 10; if ( a > 8 ) { System.out.println("Entered if Statement block"); } Double branch /* Basic grammar if (Conditional expres ...

Demand background Take a scenario. For example, at this time, we wrote a restaurant class to make different faces for users according to their needs. So how to achieve it at this time? The conventional writing method may be to take the user input as a variable, and then make if for this variable If there are n kinds of faces, there are ...

1, What is JDBC Java database connectivity. Essence of JDBC: JDBC is a set of interface s formulated by SUN company. Interfaces have callers and implementers. Interface oriented calling and interface oriented writing implementation classes belong to interface oriented programming. Polymorphic mechanism is very typical: Abstract oriented program ...

Branch statement Process control Classification: sequential structure, branch structure (if, switch), circular structure (while, do... While, for) Sequential structure Sequential structure is the simplest and most basic process control in the program. There is no specific syntax structure. It is executed in sequence according to the sequenc ...