Programmer Think

1: Link to idea database 2: The first mybatis process 1: The package and xml interceptor required by Maven are intercepted and scanned <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven. ...

Using the sklearn package of python language to realize the basic machine learning operation is very simple. After all, we only need to call part of the source code. Basic machine learning operations are nothing more than four parts: Import corresponding packages and dataData preprocessing;Model establishment and fittingModel evaluation and p ...

Algorithm website: https://visualgo.net/ Chapter 5 advanced JAVA object-oriented programming To create a new package, write it upside down according to the domain name to ensure that the package is unique You can create new classes in the package. The directory tree is shown in the figure below 5.2 5.2.3 = = and equals methods ...

1. What is cache avalanche? How? Usually, we use cache to buffer the impact on DB. If the cache goes down, all requests will be directly sent to DB, resulting in DB downtime - leading to the downtime of the whole system. How to solve it? Two strategies (used simultaneously): Make cache highly available to prevent cache downtimeUsing ...

Environment: Ubuntu 20 04 This paper records the installation of various libraries and common software, as well as the problems encountered in the installation and solutions during SLAM learning. It is only for reference. If there are problems, please point them out. Five ways to install software for Ubuntu: Ubuntu store installation Re ...

catalogue 1. Dynamic method: 2. Static registration broadcast 3. Send and receive custom broadcasts 4. Cross program receive broadcast There are two kinds of broadcasting, static broadcasting and dynamic broadcasting. 1. Dynamic method: Rewrite the broadcast receiver to accept the broadcast and operate according to the received broa ...

One afternoon, I received a request from HR on B's app and wanted a resume. So began the interview process that lasted more than a month. First, mobile phone computer HR gave me a link to algorithm problem on cattle net, asking the mobile phone to open a official account to keep it bright, and the computer to open the corresponding configuratio ...

Among the keywords of java, static and final are two keywords that we must master. Different from other keywords, they have a variety of uses, and when used in a certain environment, they can improve the running performance of the program and optimize the structure of the program. Let's first learn about the static keyword and its usage. stati ...

The blogger found a giant cow's artificial intelligence learning website a few days ago. It's easy to understand, funny and humorous. I can't help sharing it with you. Click to jump to the website. HTML5 is nothing new. We have been using several of its features since the initial version (January 2008). I took a closer look at the list of HTM ...

sceneA QR code is generated in the system, and users save it and share it. After scanning, others jump to one of our activity details pages to view the content of this activity.From the above requirements, we can extract the following points:When the user clicks generate QR code, we need to get which activity the user generated QR code is about ...