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Collection framework A collection of interfaces and classesIn Java Util package Set framework system Collection interface: Stores a non unique, unordered set of objects List interface: Store objects with = = not unique (value repeatable), ordered (insertion order) = = Set interface: Store a set of unique (values cannot be repeat ...

Reading guide This paper records the process of deploying Apollo according to the official Apollo documents. The place worthy of reference is the pit. Assuming you have a certain understanding of Apollo, you won't introduce Apollo itself too much. For documents, please refer to: https://ctripcorp.github.io/apollo/#/zh/README The deploye ...

Welcome to my blog to sync updates: Fengshan hospital Source code version 2.4.5-SNAPSHOT Hello, today, let's analyze the core ConcurrentBag of HikariCP, which is the most important core class for managing connection pools. You can see from its name that it is a concurrency management class with very good performance, which is the secret ...

Advanced chapter of Lesson 8_ Indexes I MySQL Linux Installation 1. Prepare Linux server CentOS 7.0 Final shell connection server 2. Download MySQL installation package for Linux www.mysql.com Download Community Edition (free) 3. Upload MySQL installation package 4. Create a directory and unzip it mkdir mysql tar -xvf mysql-8.0.rpm-bu ...

Creating a bitcoin trading robot will not lose money In this article, we will create a deep reinforcement learning agent to learn to make money through bitcoin trading. In this tutorial, we will use the PPO agent in OpenAIgym and the stable baselines Library (a branch of OpenAI's baselines Library). The purpose of this series of articles is to ...

Container data volume What is a container data volume Review of docker's concept Package the application and environment into an image! data If the data is in the container, we will delete the container and lose the data! Requirement: data can be persistent Mysql, the container is deleted, delete the database and run! Requirement: MySQL da ...

1, Why use JSP The difference between HTML and JSP is like I have a huge wall, and then paste the advertising cloth on it in the traditional way. Today, Zhang San pays 10000 yuan to display his adult products advertisement, and tomorrow, Li Si pays 20000 yuan to display his advertisement for treating kidney deficiency... I have to change the a ...

[source code analysis] multi process architecture and model of parallel distributed task queue Celery 0x00 summary Celery is a simple, flexible and reliable distributed system that processes a large number of messages. It focuses on asynchronous task queue for real-time processing, and also supports task scheduling. Because celery improve ...

1. volatile Memory visibility: variables in the main memory will be copied to the thread's private memory when used in a multithreaded environment. Variables modified by volatile keyword can ensure the consistency of the same variables in the main memory and the thread's private memory.No guarantee of atomicity: variables modified by volatile ...

What does springboot automatically configure for us? What can we change? Three core: spring. Factories (various automatic configuration classes)XXAutoConfiguration (autoconfiguration class)Xxproperties (property injection modification) 1. Principle of automatic assembly (most important) pom. Since the import of XML configuration, the core l ...