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1. New features of spring 5 framework The code of the whole spring 5 framework is based on Java 8, and the runtime is compatible with JDK9. Many classes and methods that are not recommended are deleted from the code base. (new feature 1) 2. Spring 5 integrates Log4j2 Version (new feature 2) The Spring 5 framework comes with a gener ...

A sequence is a group of elements with sequential relationships. One dimensional element vector, element types can be different.Sequence of similar mathematical elements:，，...，Elements are guided by sequence numbers, and specific elements are accessed through subscripts 1. Sequence type and operation As a base class, sequence derives data ...

1, What is readline readline is node JS implements the encapsulated module of standard input and output. Through this module, we can read the data stream line by line. The readline module provides an interface for reading data from a readable stream (such as process.stdin) one line at a time. You can access it in the following ways: con ...

1, Reflection 1. Overview of reflection Reflection mechanism In the running state, you can know all the properties and methods of any class; For any object, you can call any of its properties and methods; This function of dynamically obtaining information and dynamically calling object methods is called the reflection mechanism of Java ...

Delayed loading mechanism of mybatis The meaning of delayed loading: relevant operations will be carried out only when it is used Mybatis supports delayed loading of association Association objects and Collection association collection objects Difference: association usage scenario is a one-to-one association query, and collection is a one t ...

Welcome to pay attention "pymysql library learning of Python" series , continuously updating Welcome to pay attention "pymysql library learning of Python" series , continuously updating Data type read Effect of converting read data to dictionary type General reading effect Implementation idea of converting r ...

1,Config 1.1 overview 1. Problems faced by distributed Microservice means to split the business in a single application into one sub service. The granularity of each service is relatively small, so there will be a large number of services in the system. Because each service needs the necessary configuration information to run, a centrali ...

One sentence a dayThere should be a better way to start a day than waking up every morning. There should be a better way to start a day than waking up every morning.Database operationquery data baseView all databasesTo view all databases, you can use the show dbs or show databases commands> show dbs admin 0.000GB config 0.000GB local 0 ...

I preface If you and I are also a beginner of c language, this article will take you to a detailed and in-depth understanding of branch and loop statements. Don't say much, now! Start. 1. What is a statement? c language can be divided into the following five categories: 1. Expression statement 2. Function call statement 3. Co ...

Select structure The selection structure is used to judge the given conditions, judge some conditions according to the judgment results, and control the program flow according to the judgment results 1, If else statement 1. Single selection Single selection can be realized through if statement. The syntax and execution process of i ...