Programmer Group

catalogue 1, Construction of pseudo distributed 1.1 introduction to pseudo distributed mode 1.2 platform software description 1.3 requirements for building pseudo distributed environment 1.3.1 environmental requirements 1.3.2 firewall shutdown confirmation 1.3.3 configuration mapping 1.3.4 ensure that ssh is valid for password free auth ...

Niu Ke's Diary (December 6, 2021) Title: Which of the following modifiers modifies a variable that is shared by all objects generated by the same class () public private static final Resolution: Correct answer: C When static modifies a field, it will certainly change the way the field is created (each static modified field has only on ...

In daily business development, there are occasional scenarios in which the duplicate data in the List collection needs to be removed. At this time, some students may ask: why not use Set or LinkedHashSet directly? So there is no problem of duplicate data?​I have to say that the students who can ask this question are very clever and see the esse ...

⚠️ The correctness of the solution is not guaranteed! 1. There are a pair of rabbits. From the third month after birth, a pair of rabbits are born every month. The rabbits grow to another pair of rabbits every month after the third month. If none of the rabbits dies, what is the total number of rabbits per month? def main(args: Array[Strin ...

         In our daily work, we often encounter the need to implement the functions of operation log, login log, error log, etc. the young partners who have just joined the company do not know what to do, or the first idea is to write a method to add to the log table in each method in the business code, bu ...

Common generation strategies of distributed ID The common distributed ID generation strategies are as follows: Database autoincrement ID.UUID generation.Redis's atomic self increasing mode.Split the database horizontally, and set the initial value and the same self increasing step size.Self increment ID for batch application.Snowflake algorit ...

How is the website accessed? 1. Enter a domain name and press enter 2. Check whether there is this domain name mapping under the C:\Windows\System32\drivers\etc\host configuration file of this machine; ① Yes: directly return the corresponding IP address. In this address, there are web programs we need to access, which can be accessed directl ...

4. Data processing and jump In the previous section, we learned about controllers and Restful style operations Mad God says spring mvc03: RestFul and controller Now let's take a look at spring MVC parameter receiving processing and result jump processing! 4.1 result jump method 4.1.1ModelAndView Set the ModelAndView object and jump to the ...

1. Spring5 1.1 Introduction Spring - > brings spring to the software industry!The Spring framework is redesigned based on interface21!Spring concept: Making existing technology easier to use is a hodgepot that integrates existing technology frameworks!Spring is a lightweight framework for IoC and AOP containers. A framework for providing b ...

MacBook Air M1 is configured with java development environment Maven + IDEA 1. JDK configuration At present, Zulu JDK supports M1 chip. Download Azul Zulu Builds of OpenJDK After downloading, click Install and follow the steps. After that, enter java -version on the console openjdk version "17.0.1" 2021-10-19 LTS OpenJDK Runtime Environment ...