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docker network creation Containers themselves cannot be networked with each other, but they can be interconnected by placing them in the same network segment. Can pass docker network create creates a network segment name To create network segments, we can also use docker network ls to view network segments. By default, there will be thr ...

Production of front-end pages Because I learned database some time ago, the school teacher asked to make a database management system. I looked at the required topics, and the most appropriate one is the store management system (the e-commerce system that major training institutions must do). This blog is to record the production process of my ...

1. Redis transaction 1.1 role of redis transaction Redis transaction is a separate isolation operation. All commands in the transaction will be serialized and executed sequentially (because of single thread + IO multiplexing). During the execution of the transaction, it will not be interrupted by the command request sent by other client ...

summary The previous article explained the knowledge points related to window and decorview. Interested readers can see the following: Android Window series (I) - window and decorview This article will continue to explore the relationship between window and view, mainly focusing on "how to add view to window". How to add View in w ...

preface In the first section, we mentioned that on the kafka server side, we can create producers and send messages through commands. However, in the actual development, we all create producers and send messages in the project in the form of java. In this section, we will explain kafka producer based on JAVA API. 1, Introduction to JAVA API c ...

1, Introduction to awk awk is a programming language used to process text and data under linux/unix. The data can come from standard input, one or more files, or the output of other commands. It supports advanced functions such as user-defined functions and dynamic regular expressions. It is linux/unix A powerful programming tool under. ...

1, Introduction to Redis Redis is an open-source SQL database developed based on C language for the underlying code. Redis runs and persists based on memory and adopts the storage form of key value (key value pair). It is an indispensable part of the current distributed architecture Advantages of Redis It has extremely high data reading ...

I Company 1. Conversion rules: 1 px = 2 rpx 1 px = 0.75 pt = 3 / 4 pt 1 pt = 1.33 px = 4 / 3 px = 8 / 3 rpx 1 em = 16 px 1 em = 12 pt 1px = 1pt * Image resolution/72 rpx is calculated based on the ratio of the current screen width to 750, which is dynamic. It will be converted according to different screens. So it's easier to use a re ...

preface As long as you know something about collections, you must know that HashMap is thread unsafe. We should use ConcurrentHashMap. But why is HashMap thread unsafe? I also encountered such problems during the previous interview, but I only stayed at the level of knowing that * * * is * * * and didn't deeply understand why * * * is * * *. S ...

🧭 Implementation class of Map interface HashMap 🚀HashMap HashMap is an implementation class of Map interface, which is displayed in blog Java Map interface We have used HashMap to summarize the commonly used methods. HashMap is the most frequently used implementation class of Map interface.HashMap stores data in the form of key value ...