Programming VIP

1, Overview Factory is the place where products are produced. Using the concept of factory in Java design pattern is the place to generate objects. Why add a factory class to an object that can be created directly? This requires us to understand what problem the factory method is to solve. If there is only one class, we can directly new an ...

Yesterday, I saw an open source project on GitHub, which uses deep learning to detect whether people wear masks. I felt it was quite fun, so I downloaded the trained model and planned to run with the dnn module of OpenCV. However, after forward propagation, the reasoning matrix prob obtained is a 1x5972x2 Mat matrix, which is different from the ...

text Common configurationclass TextTest extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( body: Padding( padding: EdgeInsets.all(30), child: Column( children: <Widget>[ Text("hello "), //Textflow, maximum number of lines Ellipsis: ellipsis inst ...

1. grep tool grep is a * * line * * filtering tool; Used to filter rows based on keywords Syntax and options Syntax: # grep [options] 'keyword' file name Common options: OPTIONS: -i: Case insensitive -v: Finds a row that does not contain the specified content,Reverse selection -w: Search by word -o: Print matching ke ...

Recently, due to business needs, Party A asked me to provide a web service interface in the project, and then he pushed the data. Then I said to the technology of Party A, you can directly access our interface through http post, and then he innocently said to me in a dull tone, what post interface? Aren't all interfaces webservice? Besides, isn ...

1, Breakpoint continuation Breakpoint continuation overview Breakpoint continuation means that when downloading or uploading, the download or upload task is divided into several parts, and each part is uploaded or downloaded by one thread. In case of network failure, you can continue to upload and download the unfinished part from the ...

I believe everyone must be familiar with mine sweeping! But do you believe that you can make a simple minesweeping game only with some basic knowledge of C language? hhh, today, I will lead you into mine sweeping and explore the mystery of its basic algorithm. 1, Basic ideas First of all, since we are playing games, we should design the corre ...

Go language learning checking and patching Day3Zero. PrefaceBecause the author has a weak foundation and often encounters many confused problems when using Go language, the author is determined to check and fill in the gaps of Go language. This [Go language checking and filling in] series is mainly to help novice Gopher better understand the mi ...

1. What is a chain stack? Since the allocation of each element in the stack in memory is not continuous, the connection between elements is realized through a pointer in each element node. As shown below: It can be seen that the head of the linked list is used as the top of the stack. 2. Comparison between sequential stack and chain stac ...

When using a personal Alibaba cloud tester, when querying the real-time output log, you see that the database connection fails, and the server has been reconnecting to the server. At first, I thought it was a repeated attack. Later, after restarting the service, there was no continuous reconnection. See the following output log:2022-02-09 11:04 ...