Programmer Group

1, Communication characteristics Asynchronous, serial, full duplex Generally, the characteristics of a communication are: synchronous / asynchronous, serial / parallel, half duplex / full duplex Synchronization: one chip is required to control the timing of another chip. Generally, at least one bus connection is adopted between the two to co ...

Industrial pointer meter reading 1 project description In this project, we mainly introduce how to use target detection and semantic segmentation to realize the reading of pointer meter. In the power and energy plant, the meter readings need to be monitored regularly to ensure the normal operation of equipment and the safety of the plant. Ho ...

DNS DNS(Domain Name Service): provides a domain name resolution server for clients Domain name composition Overview of domain name composition Host name. Domain name is called fully qualified domain name (FQDN). There can be multiple hosts under a domain name. The domain name is unique in the world, and the host name. Domain name must be un ...

39 | bytes packet and byte string operation (Part 2)In the previous article, we shared the general function of read count in bytes.Buffer and analyzed it around this problem. Let's expand the relevant knowledge.Knowledge expansionQuestion 1: what is the capacity expansion strategy for bytes.Buffer?The Buffer value can be expanded manually or au ...

spring is actually a container, and IOC is one of them to collect our objects IOC create object User public class User { private String name; public User(){ System.out.println("User Nonparametric structure of"); } public String getName() { return name; } public void setName(String name) { ...

1, Why use ConcurrentHashMap Using HashMap in concurrent programming may lead to program loop, but using thread safe HashTable is very inefficient. In order to solve this problem, ConcurrentHashMap came out. 1) For thread unsafe HashMap, in a multithreaded environment, using HashMap for put operation will cause an endless loop (JDK1.7), which ...

Preface description Algorithm learning, daily problem brushing records. Topic connection Perfect rectangle Topic content Give you an array of rectangles, where rectangles[i] = [xi, yi, ai, bi] represents a rectangle with parallel coordinate axes. The lower left vertex of the rectangle is (xi, yi) and the upper right vertex is (ai, bi). Re ...

Django model layer Today, let's talk about Django's model layer. Django provides an abstract model ("models") layer to build and manipulate the data of Web applications. 1. The concept of model: 1. Model introduction The model can accurately and uniquely describe the data. Contains important fields and behaviors for stored da ...

4. Set set Set (also known as: Set) represents a set without duplicate elements. Features: unique, disordered The only meaning is that the elements in the Set are unique and there are no duplicate elementsUnordered means that the order in which the elements in the Set are added and taken out is inconsistent Format I: Create an empty immutabl ...

1. Mixed development Mixed development can be divided into two cases The fluent project invokes native functionsNative items are embedded in fluent (relatively heavy, not recommended) 2. The fluent project calls the native function Go back to the previous wechat like my interface to make a function of clicking on the avatar to change th ...