Programming VIP

The 3rd 83 line code challenge in 2021 hosted by Alibaba cloud has ended. More than 20000 people watched, nearly 4000 people participated, and 85 teams came in groups. The competition adopts game breakthrough playing method, integrating meta universe science fiction and script killing elements, so that a group of developers have a lot of fun.Th ...

1. Redis As a non relational database, Redis is widely used in project development, especially as a data cache to ensure the rapid response of requested data and improve the user experience of the service. Today, let's learn how to integrate Redis as a cache database in the Spring Boot project. 1.1 introducing Redis related dependencies Spr ...

Prometheus: Prometheus is an open monitoring solution. Users can easily install and use Prometheus and expand it The following will implement the whole process of a SpringBoot application accessing Prometheus 1.2 installation Linux Installation Download package specified on the official website: https://prometheus.io/download/ Download loca ...

This article mainly introduces the examples of turtle drawing in Python, and shares several small examples of turtle drawing, which has certain reference value. Friends in need can learn about it In Python, turtles can not only draw simple black lines, but also draw more complex geometric shapes with different colors, and even fill shapes with ...

Before ECMAScript 6, you can use the Object attribute of the Object as the key, and then use the attribute reference value to store the key/value; In ECMAScript 6 specification, Map and WeakMap are added to store key/value.MapThe new Map collection in ECMAScript 6 can create an empty Map using new and Map constructors:const map = new Map();You ...

When the program creates an object, it still exists after the program terminates, and the object is rebuilt the next time the program runs, and has the same information as the last time the program ran. Serialization can write objects to the byte stream, and deserialization is to restore the byte stream to objects, as shown in the following fig ...

Multi data source configuration is mostly used for automatic switching between read-write libraries or master-slave libraries. However, in some cases, it is also necessary to switch data sources in business The core principles of the current mainstream multi data source schemes, whether using the existing framework or customization, are simila ...

public void startTest() { Tested<Test1th> test = new Tested<>(); test.set(new Test1th()); Test1th td = test.get(); } Very simple. What if we need Tested to hold multiple objects? Look at chestnuts: public class Tested<A, B> { private A a; private B b; public void set(A a ...

If we decompile the above suspended function into Java, the result will be as follows: // Continuation is equivalent to CallBack // ↓ public static final Object getUserInfo(Continuation $completion) { ... return "BoyCoder"; } From the result of decompilation, the susp ...

2. Exchange sort (bubble sort, quick sort) 3. Select sort (select sort, heap sort) 4. Merge and sort []( )1, Insert sort ========================================================================= Insertion sorting is an internal sorting method, which moves the internal elements to be sorted to the appropriate position by inserting That is ...