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Thread pool execution principle and custom thread pool Thread pool execution principle: Daily record (1) . advantages of using thread pool:      Application of pooling Technology: thread pool, database connection pool, http connection pool, etc.      The idea of pooling technology is mainly to reduce t ...

Data definition The main function of DDL is to define database objects (such as database, data table, view, index, etc.). DATABASE (DATABASE) --Create database CREATE DATABASE test; --Delete database DROP DATABASE test; --Select database USE test; Data TABLE (TABLE) --Create data table --Normal creation CREATE TABLE user ( id int(10) ...

Single linked list 1. Definition of linked list Chain storage structure of linear table: the location of data elements (nodes) in linear table in memory is arbitrary, that is, logically adjacent data elements are not necessarily adjacent in physical location. Related terms: Nodes: storage images of data elements. It consists of data ...

1, Introduction to SpringBoot starter1.1 what is a starterBefore SpringBoot, if we want to use spring MVC to build our web project, we must do the following:First, we need to introduce spring MVC dependencies into the projectRegister the dispatcher servlet of spring MVC in web.xml and configure the url mappingWrite springmcv-servlet.xml and con ...

Spring Cloud Alibaba Sentinel 1, Sentinel introduction With the popularity of microservices, the stability between services and services becomes more and more important. Sentinel takes traffic as the starting point to protect the stability of services from multiple dimensions such as traffic control, fuse degradation and system load protect ...

Tips: Before creating a project, you should select the development language. The author uses Java development. If other readers also use java development, you can operate together. For example, links to other development manuals are as follows: Development using JS language (traditional code mode),Development using JS language (low code mode ...

1, jps (Java Process status) view the running java process Start the following procedure: Parameters: -q: Show ID ONLY -l fully qualified name of the output program -m output the parameters passed to main when the process starts -v list JVM parameters View process details by jps Name: 1,jps  2,jps -q  3,jps -l  4,jps -m    ...

1, Foreword  recently, I encountered a thread blocking problem caused by log4j2 logging (thanks to the development brother's logging, otherwise there would be no following operations).Give a general description of the situation at that time (due to the restriction of Intranet, we can't take out the on-site things, so we can only dictate):l ...

Construction method / constructor ● basic grammar ```java ·[Modifier ]Method name(parameter list ){ Method body; } ``` 1. The modifier of the constructor can be default or public protected private 2. The constructor has no return value 3. The method name and class name must be the same 4. The parameter list has the same rules as the membe ...

The rocketmq version is 4.9.2. The version of rocketmq spring boot starter is 2.2.1 1, Code Producer code App class package com.zgd.springboot.demo.simple; import java.util.Date; import com.zgd.springboot.demo.simple.mq.MQProducer; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.Sprin ...