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JS Foundation: four inheritance methods in JavaScript & instanceof implementation preface If you don't know much about the prototype chain and type judgment of JS, it is recommended that you first read the following two articles and then come back to understand the principle and purpose of this article Prototype: Prototype Chain Foun ...

We have already talked about the principle of Bloom filter [practical problem] - bloom filter for cache penetration (1) , we all understand that it works like this, so how do we use bloom filter in general? If you do it yourself, how do you do it? Bloom filter Read the definition again: Bloom Filter was proposed by Burton Howard Bloom in ...

Define resources Resources are one of the core concepts of sentinel. Resources here can be anything, such as services, methods in services, and a piece of code. Sentinel provides @ SentinelResource to define resources and AspectJ extension to customize resources and handle blockexceptions After adding @ SentinelResource to the resource, you c ...

1. mysql master image configuration   first, we need to obtain the dockerfile file from the docker hub official website for subsequent modifications. The address is as follows:   https://github.com/docker-library/mysql.git    then copy one copy of the 8.0 folder and name the other 8.0_slave. Enter the 8.0 folder, where ther ...

Reprinted from This article mainly explains the Java8 Stream API, but to explain this part, you need the knowledge of anonymous inner classes, lambda expressions and functional interfaces. This article will be divided into two articles to explain the above contents, which readers can refer to as needed. Java anonymous inner classes, lambda exp ...

preface The purpose of writing this article is to record your learning process so that you can review and refer to the relevant knowledge points in the future. 1, Modify Makefile and add compiler Enter the unzipped BusyBox directory, open the top-level Makefile, and add ARCH and cross_ The value of compile is as follows: CROSS_COMPILE ?=arm ...

HashMap Store key value pairs. First calculate the position in the bucket according to the key, and then put the instance in the corresponding bucket (tail insertion). If the number of instances in the bucket exceeds a certain range, the linked list will become a red black tree (but its red black tree structure still maintains the struc ...

See the article on how to use the thread pool constructor in Java to directly create an instance of thread pool Detailed explanation of Java thread pool construction parameters . However, in the Executors class, we are provided with methods to create common thread pools. Next, let's learn about the four commonly used:newFixedThreadPoolFirst, l ...

Qt event cycle process analysis This article will explain the following questions: Why does Qt application start with QCoreApplication app(argc, argv) and return app in main() function Exec() end?Why does while(true) cause the CPU to be fully loaded when both are loops? The event loop of Qt will not.Why can blocking program execution through ...

1. De duplication query According to the database tables and data created before, we put forward a demand to query the student numbers of all students who took the exam select `studentno` from `result` --Query the student numbers of all students with grades According to the results, we can see that there are a lot of duplicates in the dat ...