Programmer Group

Introduction to JMH JMH is a tool set dedicated to code micro benchmarking. JMH is developed by the team implementing Java virtual machine. Since the JVM has become more and more intelligent, it may be optimized to varying degrees in the compilation stage, class loading stage and running stage of java files, so the code written by developers ...

Recently, I checked a spring data jpa problem. In fact, it can not be regarded as a framework level problem, but rather a configuration problem; Because spring data jpa has not been used before (more mybatis or self-developed orm components), it is expected to record the configuration of spring data jpa through this article. Starting from the ...

polymorphic Before introducing the concept of polymorphism, let's introduce upward transformation as an introduction. 1, Upward transformation A variable of Person type can point to an instance of Student type: Person p = new Student(); This is because Student inherits from Person, so it has all the functions of Person. If a variable of P ...

catalogue 1, SPI introduction 2, OLED displays name and student number   3, OLED display temperature and humidity 4, OLED displays scrolling characters 5, Summary   6, Reference link 1, SPI introduction 1. Introduction to SPI protocol       SPI protocol is a serial peripheral interface proposed by Motorola, wh ...

1. Use CubeMX to build STM32F103C8T6HAL Library Configure RCC Configure SYS Set PC13 to GPIO_Output is used to light up LED lights Set Serial Port USART1 Setup Project Click Generate Code and open the project in Keil. Add statements to the while loop in the main function while (1) { /* USER CODE END WHILE */ / ...

Master slave replication working principle Master slave replication is a high availability and high performance solution provided by MySQL. The working principle is divided into the following three steps: 1. The master records the data changes in * * binlog * *. 2. The I/O thread from the slave saves the binary log read from the master lib ...

2021SC@SDUSC JaxpSAXParser 1. Summary SAX parser using JAXP 1.1 compliant parser Inherited from AbstractJaxpParser 2. Main Properties //SAX Parser Factory protected SAXParserFactory factory; //Whether the namespace should also be used as a judgment flag for attributes, defaulting to false protected boolean nsPrefixes = false; //The judg ...

leetcode - 5. Longest palindrome substring Give you a string s and find the longest palindrome substring in S. Example 1: Input: s = "babad" Output:"bab" Explanation:"aba" The same answer is in line with the meaning of the question. Example 2: Input: s = "cbbd" Output:"bb" Example 3: Input: s = "a" Output:"a" Example 4: Input: s = "ac" ...

introduceThrough a complete example, manage logs reasonably in the Gin framework.What are the usage scenarios?Log auto scroll Split into multiple log files Log format modification waitWe will use rk-boot To start the microservices of the Gin framework.Please visit the following address for a complete tutorial:https://rkdocs.netlify.app/cnins ...

prefaceHello, I'm Lin Sanxin. In the most easy to understand words, the most difficult knowledge point is my motto. The foundation is the advanced premise and my initial intention. As we all know, Promise is very important in our development. I think the use level of Promise can be divided into three levels1. Master the basic use of Promise2. M ...