Design Patterns Singleton Pattern and Factory Pattern

1. Singleton mode Eight ways of singleton mode: hungry (static constant), hungry (static code block), lazy (thread unsafe), lazy (thread safe, synchronized method), lazy (thread unsafe, synchronized code blocks), double checking, static inner classes, enums 1): Hungry Chinese style (static constant) ​ The constructor is privatized, the object i ...

Posted by Baseball on Thu, 26 May 2022 00:14:01 +0300

Go language | Are you still getting the file size like this?

In a project, we may need to get the size of a file. In Golang (Go language), there are many ways to get the size of a file to see if you are still using the slowest way. Read byte method The first one is the most intuitive to think of, which is to open the file and read the file again. func main() { file,err:=os.Open("water") if err = ...

Posted by imagenesis on Wed, 25 May 2022 23:51:37 +0300

Home stay management system based on javaweb+mysql (java+SSM+JSP+bootstrap+jQuery+mysql)

Front and back end of ssm home stay management system web page Project introduction Tourist functions: user registration, login, login permission interception, search rooms by name, payment process, view order information and status, comment on reserved rooms, automatically modify order status, view and count the number of remaining rooms. When ...

Posted by TronB24 on Wed, 25 May 2022 23:43:22 +0300

C# implementation of asynchronous, synchronous, one to many, webapi and other network frameworks based on hslcommunication

Today, let's talk about how to use hslcommunication to implement a convenient network framework. Although I have written relevant articles before, they are scattered and there is no comprehensive comparison. Today's article will explain it in combination with some actual situations. Before starting, let's introduce the official website of hslco ...

Posted by maxx99 on Wed, 25 May 2022 23:42:24 +0300

ClassCastException: java. lang.String cannot be cast to com. alibaba. fastjson. Solution of jsonobject

Problem overview About this problem, it is the problem encountered when cooperating with a third-party company to remotely call the service interface (which is equivalent to calling the remote service provider), "java.lang.ClassCastException: java.lang.String cannot be cast to com.alibaba.fastjson.JSONObject" means that the JSON str ...

Posted by deezzer on Wed, 25 May 2022 23:33:56 +0300

Spring MVC file download

File download is to download files from the file server to the local. In spring MVC, there are two steps to download files: Step 1: use a file download hyperlink on the client. The href attribute in the link points to the method and file name of downloading the file in the background; Step 2: in the background controller class, use the file dow ...

Posted by timbolt on Wed, 25 May 2022 23:22:36 +0300

Using TPU to implement ResNet50 in PyTorch

Author | DR. VAIBHAV KUMAR Compile VK Source | Analytics In Diamag PyTorch has been promoting the development of computer vision and deep learning by providing a large number of powerful tools and technologies. In the field of computer vision, the execution based on deep learning needs to process a large number of image data sets, so an accel ...

Posted by XaeroDegreaz on Wed, 25 May 2022 23:01:11 +0300

Task06: Functions and Lambda Expressions

Functions and Lambda Expressions 1. Function Remember "everything is an object" in Python? Python also treats functions as objects, which can be returned from another function to build higher-order functions, such as: parameters are functions The return value is a function function definition A function begins with the def ke ...

Posted by amargharat on Wed, 25 May 2022 22:58:27 +0300

Introduction to the initialization process of the Bluetooth protocol stack (taking CSR8311 as an example)

I. Statement We will continue to update this column by serialization. The planned update of this column is as follows: The first article: Comprehensive introduction to Bluetooth, mainly introduces some concepts of Bluetooth, its background, development track, introduction to Bluetooth on the market, and introduction to Bluetooth development ...

Posted by bumbar on Wed, 25 May 2022 22:44:40 +0300

[algorithm] the course schedule is not simple -- topological sorting

  introduction   >_< Now we need to arrange a timetable for the students (the learning order of the course) But it's not that simple:   curriculum Precursor course Course 0 Course 1 Course 0, course 4 Course 2 Course 3 Course 0 Course 4 Course 5 Course 3 Course 6 Course 3   Might as well draw a Graph and try i ...

Posted by noimad1 on Wed, 25 May 2022 22:41:14 +0300