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The HashMap data structure is very useful in most development scenarios, so we must understand its underlying principle when using it, so that we can skillfully optimize our program according to its design when using it. Later, I will explain several problems and try to be easy to understand. 1. How is the process of hash index calculation imp ...

Review review In previous issues, we learned about the matplotlib module. For the commonly used broken line chart reflecting data changes, we compared the histogram of data type differences and the histogram reflecting data frequency distribution. Quick view of content Super detailed Python matplotlib drawing histogram_ Simple programming bl ...

Some common summaries of HTML 5 and CSS The front-end (usually refers to the web page that users can see) is usually composed of three parts: 1.html: it is also the basic framework structure of the front-end web page, which is similar to the skeleton 2.CSS: also known as cascading style sheet, it exists to beautify the interface 3.Jav ...

1, Packet capture analysis of network protocol 1, Continue to practice wireshark grabbing network packets. Run the "crazy chat room" program on two or more computers (known IPv4 addresses) and capture packets through wireshark: 1) Analyze what protocol (TCP, UDP) and port number are used for network connection of this program? ...

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To use the mybatis plus code generator, you must first add dependencies (also known as import packages), and import packages according to the official website recommendations and project requirements Official website link: https://mp.baomidou.com/guide/ 1. Add code generator dependency <dependency> <groupId>com.baomidou&lt ...

Construction of centos7 Nacos service registry Since the spring cloud registry Eureka has long stopped maintenance, we use Nacos official: https://nacos.io/zh-cn/docs/what-is-nacos.html Welcome to the world of Nacos! Nacos is dedicated to helping you discover, configure, and manage microservices. Nacos provides a set of easy-to-use feature ...

1, maven basics review 1. Introduction to maven Maven is a project management tool, which is mainly used for dependency management and project construction of Java projects in the project development stage.Dependency management: it is the management of jar packages. Importing maven coordinates is equivalent to importing jar packages in th ...

On this page, we will provide an example of java 8 Arrays parallel sorting. Java 8 introduces a new method, parallelSort(), in the array class. 1. Java 8 Arrays.parallelSort() uses the sort merge algorithm to decompose the array into sub arrays, and then sort and merge them themselves. 2. The array is decomposed into subarrays, and the subar ...

​ preface: 1. When any character is stored, its ascii code value (integer int type) is stored in memory. 2. Write the function according to the document 3. Library function, user-defined function (with function name, return value type and function parameters) 1.getchar, putchar function Example 1: int main() { int ch = getchar(); pu ...