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JavaGuide

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Interview special edition : Friends who are preparing for Java interviews can consider the interview special edition: "Java Interview Guide" (high quality, specially created for interviews, and consumed with JavaGuide).
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Project related

Project introduction
Usage suggestions
Contribution Guide
FAQ

Java

Base

Summary of knowledge points/interview questions : (must read: +1: ):

Java basic common knowledge points & summary of interview questions (Part 1)
Java basic common knowledge points & summary of interview questions (Part 2)
Java basic common knowledge points & summary of interview questions (Part 2)

Detailed explanation of important knowledge points :

Why is there only passing by value in Java?
Detailed explanation of Java serialization
Detailed explanation of generics & wildcards
Detailed explanation of Java reflection mechanism
Detailed explanation of Java proxy mode
BigDecimal detailed explanation
Detailed explanation of Java magic class Unsafe
Detailed explanation of Java SPI mechanism
Detailed explanation of Java syntactic sugar

gather

Summary of knowledge points/interview questions :

Java collection common knowledge points & summary of interview questions (Part 1) (must read?)
Java collection common knowledge points & summary of interview questions (Part 2) (must read?)
Summary of precautions for using Java containers

Source code analysis :

ArrayList core source code + expansion mechanism analysis
LinkedList core source code analysis
HashMap core source code + underlying data structure analysis
ConcurrentHashMap core source code + underlying data structure analysis
LinkedHashMap core source code analysis
CopyOnWriteArrayList core source code analysis
ArrayBlockingQueue core source code analysis
PriorityQueue core source code analysis
DelayQueue core source code analysis

IO

Summary of IO basic knowledge
Summary of IO design patterns
Detailed explanation of IO model
NIO core knowledge summary

concurrent

Summary of knowledge points/interview questions : (must read?)

Java concurrency common knowledge points & summary of interview questions (Part 1)
Java concurrency common knowledge points & summary of interview questions (Part 2)
Java concurrency common knowledge points & summary of interview questions (Part 2)

Detailed explanation of important knowledge points :

Detailed explanation of optimistic locking and pessimistic locking
CAS detailed explanation
Detailed explanation of JMM (Java Memory Model)
Thread Pool : Detailed Explanation of Java Thread Pool, Best Practices of Java Thread Pool
ThreadLocal detailed explanation
Java concurrent container summary
Atomic atomic class summary
AQS detailed explanation
Detailed explanation of CompletableFuture

JVM (must see?)

This part of JVM mainly refers to the JVM virtual machine specification-Java8 and "In-depth Understanding of Java Virtual Machine (3rd Edition)" by Mr. Zhou Zhiming (strongly recommended to read it multiple times!).

Java memory area
JVM garbage collection
Class file structure
Class loading process
class loader
[To be completed] Summary of the most important JVM parameters (the translation is half complete)
[Additional meal] Let’s get to know the JVM in plain English
JDK monitoring and troubleshooting tools

new features

Java 8 : Summary of new features of Java 8 (translation), summary of common new features of Java 8
Overview of new features in Java 9
Overview of new features in Java 10
Overview of new features in Java 11
Overview of new features in Java 12 & 13
Overview of new features in Java 14 & 15
Overview of new features in Java 16
Overview of new features in Java 17
Overview of new features in Java 18
Overview of new features in Java 19
Overview of new features in Java 20
Overview of new features in Java 21
Overview of new features in Java 22 & 23

computer basics

operating system

Common operating system knowledge points & summary of interview questions (Part 1)
Common operating system knowledge points & summary of interview questions (Part 2)
Linux :
- Summary of basic Linux knowledge necessary for back-end programmers
- Summary of basic knowledge of Shell programming

network

Summary of knowledge points/interview questions :

Common computer network knowledge points & summary of interview questions (Part 1)
Common computer network knowledge points & summary of interview questions (Part 2)
Summary of the contents of "Computer Network" by Teacher Xie Xiren (Supplement)

Detailed explanation of important knowledge points :

Detailed explanation of OSI and TCP/IP network layering models (basics)
Summary of common protocols in the application layer (application layer)
HTTP vs HTTPS (application layer)
HTTP 1.0 vs HTTP 1.1 (application layer)
HTTP common status codes (application layer)
Detailed explanation of DNS domain name system (application layer)
TCP three-way handshake and four-way wave (transport layer)
TCP transmission reliability guarantee (transport layer)
Detailed explanation of ARP protocol (network layer)
Detailed explanation of NAT protocol (network layer)
Summary of common means of network attacks (security)

data structure

Graphical data structure:

Linear data structures: arrays, linked lists, stacks, queues
picture
heap
Tree: focus on red-black trees, B-, B+, B* trees, LSM trees

Other commonly used data structures:

bloom filter

algorithm

This part of the algorithm is very important. If you don’t know how to learn algorithms, you can read what I wrote:

Algorithm learning books + resource recommendations.
How to flash Leetcode?

Summary of common algorithm problems :

Summary of several common string algorithm questions
Summary of several common linked list algorithm questions
The sword points to some programming questions in the offer
Top ten classic sorting algorithms

In addition, the website GeeksforGeeks summarizes common algorithms and is more comprehensive and systematic.

database

Base

Summary of database basic knowledge
Summary of NoSQL basic knowledge
Detailed explanation of character sets
SQL:
- Summary of basic knowledge of SQL syntax
- Summary of common SQL interview questions

MySQL

Summary of knowledge points/interview questions:

MySQL common knowledge points & summary of interview questions (must read?)
Summary of recommendations for MySQL high-performance optimization specifications

Important knowledge points:

Detailed explanation of MySQL index
MySQL transaction isolation level (detailed graphic and text explanation)
Detailed explanation of MySQL's three major logs (binlog, redo log and undo log)
Implementation of MVCC by InnoDB storage engine
The execution process of SQL statements in MySQL
Detailed explanation of MySQL query cache
MySQL execution plan analysis
Does MySQL’s auto-incrementing primary key have to be continuous?
MySQL time type data storage recommendations
MySQL implicit conversion causes index failure

Redis

Summary of knowledge points/interview questions : (must read: +1: ):

Redis common knowledge points & summary of interview questions (Part 1)
Redis common knowledge points & summary of interview questions (Part 2)

Important knowledge points:

Detailed explanation of 3 commonly used cache read and write strategies
Detailed explanation of 5 basic data structures of Redis
Detailed explanation of 3 special data structures of Redis
Detailed explanation of Redis persistence mechanism
Detailed explanation of Redis memory fragmentation
Summary of Common Redis Blocking Causes
Detailed explanation of Redis cluster

MongoDB

MongoDB common knowledge points & summary of interview questions (Part 1)
MongoDB common knowledge points & summary of interview questions (Part 2)

search engine

Summary of common interview questions in Elasticsearch (paid)

development tools

Maven

Summary of Maven core concepts
Maven best practices

Gradle

Summary of Gradle core concepts (optional, Maven is still more common in China)

Docker

Summary of Docker core concepts
Docker in practice

Git

Summary of Git core concepts
Summary of GitHub practical tips

System design

Summary of common system design interview questions
Summary of common interview questions about design patterns

Base

RestFul API brief tutorial
A Concise Tutorial on Software Engineering A Concise Tutorial on Software Engineering
Code Naming Guidelines
Code Refactoring Guide
Unit Testing Guide

Commonly used frameworks

Spring/SpringBoot (must read?)

Summary of knowledge points/interview questions :

Spring common knowledge points & summary of interview questions
SpringBoot common knowledge points & summary of interview questions
Summary of Spring/Spring Boot common annotations
SpringBoot Getting Started Guide

Detailed explanation of important knowledge points :

Detailed explanation of IoC & AOP (understand quickly)
Detailed explanation of Spring transactions
Detailed explanation of design patterns in Spring
Detailed explanation of SpringBoot automatic assembly principle

MyBatis

Summary of MyBatis common interview questions

Safety

Authentication and authorization

Detailed explanation of basic concepts of authentication and authorization
Detailed explanation of JWT basic concepts
JWT advantages and disadvantages analysis and solutions to common problems
Detailed explanation of SSO single sign-on
Detailed explanation of permission system design
Summary of common encryption algorithms

Data desensitization

Data desensitization means that we deform sensitive information data according to specific rules. For example, we use * to replace certain digits of mobile phone numbers and ID numbers.

Sensitive word filtering

Summary of sensitive word filtering solutions

scheduled tasks

Detailed explanation of Java scheduled tasks

Web real-time message push

Detailed explanation of Web real-time message push

distributed

Theory & Algorithm & Protocol

Interpretation of CAP theory and BASE theory
Interpretation of Paxos algorithm
Interpretation of Raft algorithm
Detailed explanation of Gossip protocol

RPC

Summary of RPC basic knowledge
Dubbo common knowledge points & summary of interview questions

ZooKeeper

These two articles may have overlapping content, so it is recommended to read them both.

Summary of ZooKeeper related concepts (getting started)
Summary of ZooKeeper related concepts (advanced)

API gateway

Summary of API Gateway Basics
Spring Cloud Gateway common knowledge points & summary of interview questions

Distributed ID

Introduction to distributed ID & summary of implementation solutions
Distributed ID Design Guide

Distributed lock

Introduction to distributed locks
Summary of common implementation solutions for distributed locks

Distributed transactions

Common knowledge points of distributed transactions & summary of interview questions

Distributed configuration center

Common knowledge points of distributed configuration center & summary of interview questions

high performance

Database optimization

Database reading and writing separation and sub-database and sub-table
Separation of hot and cold data
Summary of common SQL optimization methods
In-depth paging introduction and optimization suggestions

load balancing

Load balancing common knowledge points & summary of interview questions

CDN

CDN (content distribution network) common knowledge points & summary of interview questions

message queue

Summary of basic knowledge of message queue
Disruptor common knowledge points & summary of interview questions
RabbitMQ common knowledge points & summary of interview questions
RocketMQ common knowledge points & summary of interview questions
Kafka common knowledge points & summary of interview questions

High availability

Highly available system design guide

Redundant design

Detailed explanation of redundant design

Current limiting

Detailed explanation of service current limit

Downgrade & circuit breaker

Detailed explanation of downgrade & circuit breaker

Timeout & Retry

Detailed explanation of timeout & retry

cluster

Deploy multiple copies of the same service to avoid single points of failure.

Disaster recovery design and multi-activity in remote locations

Disaster recovery = disaster recovery + backup.

Backup : Make several copies of all important data generated by the system.
Disaster recovery : Establish two identical systems in different places. When a system somewhere suddenly hangs up, the entire application system can be switched to another one so that the system can provide services normally.

Multi-activity in remote locations describes the deployment of services in remote locations and the services are provided to the outside world at the same time. The main difference from traditional disaster recovery design is "multi-activity", that is, all sites provide services to the outside world at the same time. Living in different places is to cope with emergencies such as fires, earthquakes and other natural or man-made disasters.