Programmer Group

Catalog   1, Standard library 1. regexp package: regular expression 2. sync package: lock and sync 2.1 sync.Mutex mutex 2.2 sync.RWMutex read / write lock 2.3 once.Do(call) 2, Use of packages 1. Custom package 2. reference package 3. Initialization of package 1, Standard library Built i ...

I. Preface WeChat public number development (1) WeChat access certification as developer This article will implement receive messages Reply message 2, Message reception Message receiving POST and wechat authentication GET are the same interface (URL filled in by the developer) @Slf4j @RestContro ...

Several ways for Android to update UI through subthread In general, the update of UI cannot be without Handler. First, let's understand the Handler mechanism: Handler message mechanismDefinition MessageThe data unit for inter thread communication can carry the required data through message to create an object: Message.obtain(what) HandlerHandle ...

If you give me one, I know I've filled one String Of MemoryStream , how can I retrieve a String? #1 building Previous solutions didn't work when it came to coding. It's - a "real life" - like how to do it right using(var stream = new System.IO.MemoryStream()) { var serializer = new D ...

Common functions of Numpy 1. Read matrix file xxx,xxx,xxx,xxx xxx,xxx,xxx,xxx xxx,xxx,xxx,xxx It consists of data items in several rows and columns. The number of items in each row must be equal, the type of data items in each column must be the same, and there is a clear separator between data ...

Preface Since the last two blogs Python genetic and evolutionary algorithm toolbox and its application in constrained single objective function value optimization And genetic algorithm The shortest path of directed graph After that, I learned the official documents of the toolbox and the research of ...

Record the problems encountered during the completion of the project. When java reads UTF-8 format file, it finds a very depressing problem: when the UTF-8 format file edited by ue is read, it will read an invisible character from the first line of the file. The test code is as follows: package test; i ...

Dependency injection in spring IOC role: reduce the coupling between programs (dependency) Dependency management: to be maintained by spring (objects of other classes are needed in the current class, provided by spring, we only need to explain in the configuration file) Dependency maintenance: depende ...

abstract Beautiful Soup is a Python library that can extract data from HTML or XML format files by parsing HTML or XML data into Python objects for easy processing through Python code. Document environment Test environment for code in this document Instructions for using Beautifu Soup The basic function of Beautiful Soup is to find and e ...

Now the use of QR code is more and more widely, and it can be seen almost everywhere, and almost all of the company's related projects are related to QR code scanning, so summarize your own experience of using QR code, and always feel that something should be done to record your growth, so that your gro ...