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How do I avoid deadlocks?
When concurrent programs become deadlocked, we often have to restart the application.The best way to solve the deadlock problem is to avoid it. Condit...
20190110 - generate password and simple password strength check
1. Generate 9-letter password Using the random.choice function, this function requires a sequence, so a given sequence contains A-Z, A-Z #step1: Gener...
The use of Spring @Async annotation
Premise of use If there is an asynchronous method in the current class a.class and @ Async is used, it must be called by other classes (such as b.clas...
android ------ RecyclerView imitates Taobao shopping cart
Shopping cart is often used in e-commerce projects. There are many projects with different interfaces. Choose one to talk about it. RecyclerView imita...
Exception handling in [C + +] 64 μ C + +
C + + exception handling C + + has built-in exception handling syntax element try... Catch try statement handles normal logic code catch statement pro...
Easy to use C language to achieve student achievement management system (source code attached)
image I believe that most beginners have to do such a program, that is to use C language to realize a student performance management system, which re...
How to create a shaky loader with pure CSS
Effect preview Online demo Press the "click preview" button on the right to preview on the current page, and click the link to preview in f...
bzoj4818 SDOI2017 sequence count
Title Link thinking First of all, consider the scheme number of violence \ (dp \), \ (f[i][j] \) represents the number of first \ (I \), the sum of nu...
V. custom converter, httprequest image alignment, HttpResponse, JsonRepons of view layer
I. virtual environment 1. Create with Python - > files - > new project - > select virtual environment 2 Settings > project creation 3. Cr...
cookies and sessions components
Catalog Cookies and session s cookie introduction session Introduction token django operation cookie Set cookie Get cookie delete cookie Login authen...
1030 perfect sequence (25 points)
Given a positive integer sequence, and a positive integer p, let the maximum value of the sequence be m, and the minimum value be m. if M ≤ mp, the s...
Implementation principle of ArrayList (JDK 1.8)
Implementation principle of ArrayList (JDK 1.8) public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, ...
The realization of headless bidirectional linked list
1. head insertion public void addFirst(int data) { //Head insertion DLinkedNode newNode = new DLinkedNode(data);//New nodes joined DLinkedNode next =...
python(leetcode) - repeated element algorithm
leetcode primary algorithm Problem description Given an array of integers, determine whether there are duplicate elements. If any value appears in the...
spring's Custom Annotation Analysis
Preface spring provides rich annotations, but sometimes does not meet the complex needs of existing businesses. We can refine our business framework b...
Filter query of hbase
There are many filters for hbase: they can be roughly divided into two categories: comparison filter and special filter. The function of filter is to...
A simple example of go in + caspin RBAC
Explain //Libraries used: github.com/casbin/casbin github.com/gin-gonic/gin github.com/facebookgo/inject This article is for reference: https://githu...
Team Tic Tac Toe solution
Question: Translation: Some cows are playing a game: They wrote some letters on a 3 * 3 blackboard The first letters of these cows are A Z If the sam...
ThinkPHP+JQuery for asynchronous file upload
Front-end code <!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title>ThinkPHP+JQuery...
Several ways to realize multithreading
This blog series is a record summary of learning concurrent programming. Due to the large number of articles and the scattered time of writing, I arra...
k8s uses glusterfs to realize dynamic persistent storage
brief introduction This article introduces how to use glusterfs to provide k8s with the function of dynamic pv application. Glusterfs provides the un...
Using NasNet model and keras to do deep learning training is wrong
When using NasNet model and keras for deep learning training, the following code is used I. code chip: inputs = Input((224, 224, 3)) base_model = NAS...
jinkens+gitlab implement CI/CD for k8s cluster
I. environmental preparation K8s cluster environment (here I am k8s cluster of three sets); A single docker server is mainly used to upload images to...
ASH production practice I of Oracle10G
ASH practice 1 of Oracle10G ASH is a new feature of Oracle 10g, which is very valuable for DBA. It is based on V $sssion and samples once a second, R...
Using HttpClient to send file stream to server
Applicable scenarios:The URL file or picture of the absolute path of the network is not stored locally, but converted into stream. It is directly tran...
The use of Gson serializer
Business scenario: Recently, we are doing a file path encryption. Many classes are designed to file paths. Because the framework used in our project i...
20190108 use of recursive function to realize the use of basic recursive functions such as finding the greatest common divisor
1. Given a = [1,2,[3,4,[5,6,7,[8,9,[10,11]]]], print output is required: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 Use the recursive function to traverse A. w...
April 4, 2019 [Tsinghua training 2017], [LOJ2326], [Luogu P4224] simple data structure (line screen processing factor table) (DP) (set maintenance)
LOJ portal Luogu portal Analysis: In fact, I have said so much in the title. There is a sentence The same number can only be inserted c times at most...
[Python learning] guess age through the while loop and for loop
Python can limit the number of guesses about age by using while and for loops 1. In the small program of guessing age, the code without loop is as fol...
Remember the problems in SpringBoot1. * to Springoot2.0
1. Interceptor problem Write static path pattern in the configuration file after 2.0. / static / * * has no effect (2.0 needs to be configured in the ...