1. First letter drop

I have been working for many years and have met all kinds of colleagues. I have seen all kinds of code, excellent, rubbish, unattractive, etc, so this article records what good development habits or best practices an excellent Java development should have. 1 Encapsulation method parameters When your method has too many formal parameters…

I have worked for many years, and the following are the LINUX common commands I have compiled for work, which are completely sufficient for daily use. 1. System Service Management 1.1 systemctl Output the status of each service in the system: systemctl list-units --type=service View the running status of the service: systemctl status firewalld Close the…

In normal development, especially when configuring NGINX, 127.0.0.1, 0.0.0.0, and localhost will appear. Do you know the difference between them? 1. IP address classification 1.1 IP address representation The IP address consists of two parts, net-id, and host-id, namely the network and host numbers. net-id: Indicates the network number where the IP address is located. host-id: Indicates a…

Sometimes, due to the complexity of the business, assembling some data in the JVM will cause a great waste of resources. For example, query a List from MySQL, and then loop through the database in the code to fill in some fields. This data assembly method, in addition to the…

The time is set for the 24th of this month, and Spring Boot will release the final RELEASE version of 3.0. So far, Spring Boot 3 has released 6 versions, accumulatively 5 milestone versions, and 2 RC candidate versions. Now follow me to see what major changes Spring Boot 3.0…

The pictures we export from PS and other tools, or the cut pictures directly given by art, are all uncompressed and relatively large. Here, there is room for optimization. 1. TinyPng TinyPNG uses intelligent “lossy compression technology” to reduce the file size of WEBP, JPEG and PNG files. Uses fewer bytes to…

Web3.0The voices are getting louder and crazier recently. For our front end, what technology do we need to have? First, let's talk about how Web3.0is derived 1. The Internet Let's talk about what the web is. In 1989, a technical group led by Tim Berners-Lee at CERN (European Institute of Particle Physics) submitted…

Generally speaking, it is best not to exceed 20 million pieces of data per table in MySQL, otherwise, it will lead to performance degradation. Alibaba's Java Development Manual also states that sub-database sub-tables are recommended only when the number of rows in a single table exceeds 5 million rows or…