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Redis data types (5 common) typeImplementation principlestringStringhashHashMaphashLinkedListsetHashSetsorted_setTreeSet redis data storage format redis itself is a Map in which all data is stored in the form of key:value.Data type refers to the type of stored data, that is, the type of value part. The key part is always a string. 1.string ...

All Rights Reserved © jackiegu.cn 1. JVM runtime memory data area division Program counterJava virtual machine stackNative Method Stack Java heapMethod areaRuntime Constant Pool 2. Program counter The program counter is a small memory space, which can be understood as the line number indicator of the bytecode file executed by the curr ...

What is Netty 1. Netty is a client server framework based on NIO, which can be used to develop network applications quickly and easily. 2. It greatly simplifies and optimizes network programming such as TCP and UDP socket server, and has even better performance and security. 3. Support a variety of protocols, such as FTP, SMTP, HTTP and ...

1, File class 1.1. Overview and construction method of File class File: it is an abstract representation of file and directory pathnames Files and directories can be encapsulated into objects through File File (String pathname) / / creates a new file instance by converting the given path name string to an abstract path name File (String p ...

preface "If you cannot measure it, you cannot improve it". In daily development, there are many options for calling some code or using tools. When we are not sure about their performance, the first thing we want to do is to measure it. Most of the time, we will simply use multiple counts to measure the total time-consuming of this method. Ho ...

title: Java basic syntax date: 2021-02-04 14:24:12 categories: Java tags: Basics After learning C language, thinking is still process oriented programming thought. Now start learning Java and change your mind. I hereby write a blog to record the knowledge points of Java. Some common repetitive contents in the programming language (such as e ...

Learning points of Java and big data development (under continuous update...) Reference from HashMap? ConcurrentHashMap? I believe no one can stop you after reading this article! 1, Foreword Key and value such as Map are very classic structures in software development. They are often used to store data in memory. This article mainl ...

ArrayList and LinkedList are succinctly compared: ArrayList has fast query speed and slow insertion (insert in the middle, not at the end), while LinkedList has slow query speed and fast insertion (insert in the middle). What is the reason for their difference? After understanding their underlying implementation, we can know that the underlyin ...

preface"If you cannot measure it, you cannot improve it".In daily development, there are many options for calling some code or using tools. When we are not sure about their performance, the first thing we want to do is to measure it. Most of the time, we will simply use multiple counts to measure the total time-consuming of this method.However, ...

start A battle between job seekers and interviewers is taking place in a business building in Hangzhou. Interviewer: introduce yourself first. Angela: Hello, interviewer. I'm the three bitches in the grass, the strongest single (Daji refuses to accept), the grass motorcycle driver, the promoter of the 21st set of radio gymnastics and the suc ...