Java
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JDK1. 8. Reading the source code of concurrenthashmap
1. Read with questions Why is concurrent HashMap thread safe? Or how does concurrent HashMap prevent concurrency? 2. F…… -
Distributed transaction
In essence, distributed transaction is to ensure the data consistency of different databases. 1. Distributed theory 1.…… -
Java generate globally unique ID code demo
I have seen two algorithm programs for generating unique IDs on GitHub (one from Baidu and the other from meituan) and…… -
Redisson basic usage
1. Redisson Redisson is the Java version of redis client officially recommended by redis. It provides many functions a…… -
Java fork / join framework
brief introduction From jdk1 At the beginning of July 7, Java provided fork / join framework for parallel execution of…… -
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JDK1. Implementation of HashMap in 8
JDK1. The implementation of HashMap in 8 is similar to jdk1 The implementation in 7 is very different. Jdk1 is analyze…… -
E-commerce promotion background logic
In the final analysis, the so-called marketing of e-commerce is the change of order amount; If we clearly know the cal…… -
FutureTask
Asynchronous, never synchronous, parallel, never serial 1. Future A future represents the result of an asynchronous ca…… -
Java export Excel
preface As we all know, excel is divided into two steps: These two steps are time-consuming. Generally, we check the d…… -
Java 8 Documentation Download
Java API download method https://www.oracle.com/index.html https://www.oracle.com/java/technologies/java-se.html http:…… -
Java rule engine easy rules
1. Easy rules overview Easy rules is a Java rule engine, inspired by an article entitled "should I use a rules engine?…… -
Java NIO
1. General Java NiO (New IO) consists of the following three core components: Generally, in NiO, IO starts with a chan…… -
Sharding JDBC quick start lesson 1
1. General Shardingsphere is an ecosystem composed of a set of open source distributed database middleware solutions. …… -
Introduction to bitmap
1. BitMap The basic idea of bit map is to mark the value corresponding to an element with a bit bit, and the key is th…… -
Best memory cache framework caffeine
Caffeine is a high-performance cache library and the best (optimal) cache framework based on Java 8. Cache (CACHE), ba…… -
Concurrent inventory reduction
There are many scenes of second kill, such as rush buying, ticket grabbing, red envelope grabbing, etc. In short, ther…… -
Upward leadership and downward empowerment
After all these years in the pit, as a Java siege lion and senior code Porter, I have something to say: 1. Raise techn…… -
Introduction to reactive
Reactive is ideal for low latency, high throughput workloads. Reactive processing is a paradigm (specification) that e…… -
Android development failed to install * apk on device ’emulator-5554′: EOF
This error occurs when running the Android program: Failed to install homework. apk on device 'emulator-5554': EOF…… -
Java calls the HTML template to send the mail of HTML content
When the project needs to send e-mail, the e-mail with ordinary content feels too monotonous, ugly and unqualified. Th…… -
Android multilingual
Android multilingual 3. Use @ Strings / key in the layout file to reference the corresponding resources -
JSP uses freemaker to generate word documents based on word template
Using freemaker to generate word document based on word template Introduction to freemaker FreeMarker is a template en…… -
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Maven Foundation
Maven introduction What is Maven Maven's correct pronunciation is[ ˈ mev ə n] , not "horse plague" and other plagues. …… -
Enterprise authority management system
brief introduction This project uses spring + spring MVC + mybatis framework integration for enterprise background per…… -
Cookie&Session
primary coverage 1. 会话技术 1. Cookie 2. Session 2. JSP：入门学习 Conversation Technology 1. 会话：一次会话中包含…… -
How Java compares floating point numbers correctly
Look at the following code to compare D1 and D2 floating-point numbers. What will be the output result? double d1 = .1…… -
Maven Foundation
Maven introduction What is Maven Maven's correct pronunciation is[ ˈ mev ə n] , not "horse plague" and other plagues. …… -
Collection, generic
primary coverage Learning objectives Chapter 1 collection 1.1 collection overview Since both sets and arrays are conta…… -
Request&Response
I reviewed the contents of request and response in these two days. primary coverage HTTP * 概念：Hyper Text Transfer P…… -
Multithreading
primary coverage Learning objectives Chapter 1 multithreading Before, the programs we learned were executed from top t……