Redis list [4] - quicklist of data structure

1. Overview As mentioned earlier, before version 3.2 of Redis, ziplist was used to store under 512 small integers and short strings of under 64 bytes, while linkedlist was used to store other data. However, due to the relatively high additional space of the linked list, prev and next pointers take up 16 bytes (the 64 bit system pointer is 8 b ...

Posted on Wed, 20 May 2020 06:41:39 -0400 by hafez

Thread pool and CountDownLatch are used together in Spring project to solve the examples of statistics and accumulation business.

Business description: To avoid disrespect, just write technology, and the business here is replaced by the analogy of "counting the total number of all kinds of animals in the zoo". I want to write an interface and spit out "the sum of all kinds of animals in the zoo". It is known that there are 15 kinds of animals. Now th ...

Posted on Wed, 20 May 2020 05:32:43 -0400 by ScoTi

Are objects in Java allocated on the heap?

By LittleMagichttps://www.jianshu.com/p/8377e09971b8 In order to prevent ambiguity, we can put it another way: Are Java object instances and array elements allocated memory on the heap? A: not necessarily. When certain conditions are met, they can allocate memory on the (virtual machine) stack. JVM memory structure is very important, review ...

Posted on Wed, 20 May 2020 03:48:52 -0400 by xphoenixx

Is exception handling still disabled by your c + + team?

There are many disputes about c + + exception handling on the Internet. This article will introduce the use of c + + exception handling, should we use exception handling, and what should be paid attention to when using exception handling. What is exception handling Exception handling, of course, refers to the handling of exceptions. Exceptions ...

Posted on Wed, 20 May 2020 03:33:25 -0400 by johnnyblotter

Fault tolerance of String to null object in Java!

Author: Xiao Hansong blog.xiaohansong.com/2016/03/13/null-in-java-string/ Recently, I was reading Thinking in Java, and I saw this passage: _Primitives that are fields in a class are automatically initialized to zero, as noted in the Everything Is an Object chapter. _ _But the object references are initialized to null, and if you try to call ...

Posted on Wed, 20 May 2020 00:41:26 -0400 by r2ks

Spring Framework: Understanding spring

1. Overview Official introduction of spring: "The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform. A key element of Spring is infrastructural support at the application level: Spring focuses on the "plumbing" of enterprise applicati ...

Posted on Wed, 20 May 2020 00:12:03 -0400 by rallen102

North Airlines OO (2020) Unit 3 Blog Job

Catalog North Airlines OO (2020) Unit 3 Blog Job JML Language Summary theoretical basis Declarations of specification variables Common Expressions Method Specification Type specification Application Tool Chain Situation OpenJML validation Par ...

Posted on Tue, 19 May 2020 20:00:26 -0400 by LordPsyan

Simple Online Chat Websocket

Preface What is Webscoket ? websocket application scenarios Brief Group Chat Implementation Code examples Summary Webscoket Websokcet is a single TCP On Connection full duplex Protocol for communication, through HTTP /1.1 Protocol 101 status code for handshake. http://websocket.org Websocket application scenarios Web ocket and Htt ...

Posted on Tue, 19 May 2020 12:21:49 -0400 by softnmedia

Java implementation sends Get and Post requests

preface I haven't written a blog for several days, because there are a lot of things in my life recently. Although I am learning every day, I haven't recorded the knowledge points in my blog, which is very bad In the future, we must stick to blogging and record our growth I hope I can find some like-minded frie ...

Posted on Tue, 19 May 2020 11:01:15 -0400 by tim_ver

Java Experiment 4 -- employee information management system

preface Time: Two 0 Two 0.5.18 Note: I haven't typed the code seriously for a long time. I started to move myself when I finished a search of addition, deletion and modification subject Realization ideas I'm afraid that the repetition rate of homework is too high, so I won't put it up first~ ...

Posted on Tue, 19 May 2020 10:27:48 -0400 by sigkill-9