java notes

java-notes

introduction

• Personal blog
• Online interview reading
• Dreamcats official account : visit link

?DreamCats

type	name	source
Mini program	Online interview assistant	DreamCats
Facial Sutra	Summary of the experience of major manufacturers	DreamCats
knowledge system	Java backend knowledge classification	DreamCats
	Crazy vomiting blood series	DreamCats
	Knowledge architecture mind map	DreamCats
Review questions	CS-Notes	cyc
	Write algorithm routine template	labuladong
	Summarize LC by popularity	DreamCats
	Sword pointing at Offer	DreamCats
	Personal Autumn Recruitment and Familiar Questions	DreamCats
	Hot topics in autumn recruitment exams	DreamCats
	LC-SQL	DreamCats
	Illustrated SQL interview questions	xxx
	Niu Ke starts walking	xxx
project	Microservice shuttle online reservation system-documentation	DreamCats
	Microservice shuttle online reservation system-project address	DreamCats
	Station B has purchased 2 practical Java projects: just choose one and study it carefully	JavaGuide
other	JDK1.8 partial source code	DreamCats
	Books to read accordingly	DreamCats
	A brief introduction to Spring	DreamCats
	Push lc script online	DreamCats
	Push knowledge points online	DreamCats

Article series

There are articles written by better technical teams, which are worth reading and will benefit a lot from. For example: Alibaba Technology, Meituan Technology Team, etc.

? other

type	name	source
Other	free-programming-books	EbookFoundation
Other	Computer professional e-books download	IT coder
Other	Computer professional e-book download-2	javaer-roadmap
Other	Various technical development documents	Shuzhan.com
Other	TikTok 2nd Side: Tell us about the principle of QR code login?	Xiaohaxue
Other	Performance optimization: some thoughts on caching	Alibaba Technology
Other	Questions to ask the interviewer at the end of the technical interview

?Java

type	topic	source
Java	Interviewer: Let’s talk about the three-color marking of JVM garbage collection. To avoid pitfalls, just read this article.	The road to Java coder
Java	How does the JVM determine which objects can be recycled?	Big Fish Immortal
Java	The clever designs in Java Map	Alibaba technical team
Java	ZGC in JDK 16: average pause time 0.05 ms	Glavo
Java	Let’s talk about synchronized lock upgrade again	coder ginseng
Java	Java thread pool source code analysis	Xiao Bin
Java	Is the immutability of String really due to final?	Flying veal
Java	A wave of useful information after the holidays: clarifying JVM and GC in one article	Java Architect Alliance
Java	What are the problems with sychronized in high concurrency situations in Java ?	Jian
Java	Java concurrency high-frequency interview questions: Tell me about your understanding of AQS?	Ao Bing
Java	[Basic Skills] Java "lock" things that must be said	Meituan technical team
Java	Why does HashMap under concurrency cause an infinite loop? ? ?	Java Learner Community
Java	After being laid off twice, I finally solved the database cache consistency problem	Coder novelist
Java	Stop worrying about thread pool size/number of threads, there is no fixed formula	nothing
Java	What is the difference between Spring interceptors and filters?	Huawei Cloud Developer Community
Java	Interviewer: Can you tell me eight usage scenarios of the Synchronized synchronization method?	I am a programmer
Java	Research on Java memory access reordering	Meituan technical team
Java	Interviewer: Let’s talk about the three-color marking of JVM garbage collection. To avoid pitfalls, just read this article.	The road to Java coder
Java	A brief analysis of Java NIO	Meituan technical team
Java	Some key technologies of Java Hotspot G1 GC	Meituan technical team
Java	Java 8 series: Re-understanding HashMap	Meituan technical team
Java	Exploration and practice of the new generation garbage collector ZGC	Meituan technical team
Java	Java thread pool implementation principle and its practice in Meituan business	Meituan technical team
Spring	Taking stock of SpringIOC: circular dependencies	Poor program source
Java	A summary of common class loading errors, very well written!	The Java Way
Java	Detailed explanation of the Unsafe class of Java's double-edged sword	Dr Hydra
Java	With CopyOnWrite, why do we need ReadWriteLock?	java finance
Java	ThreadLocal usage and principle	Ao Bing
Java	Summary of dynamic agents, everything you need to know is here, no nonsense!	The moon accompanies the flying fish
Java	Java Concurrency - Thread Pool - With Scenario Analysis	sweet dumpling
Java	Learn Java dynamic proxy from source code perspective	Galen specializes in bells and whistles
Java	Now that you have reached the point where you need to ask about the three-color markings?	Ai Xiaoxian
Java	An article to understand whether JVM threads belong to user mode or kernel mode	Quancai engineer Xiaohui
Java	One article to understand the SPI mechanism in Java	Quancai engineer Xiaohui
Spring	Explain to your boss why you should use SpringCloud alibaba as a microservice development framework? ? ?	Piaopiaosha Jam
Spring	How to implement a simple version of Spring - How to implement AOP (final chapter)	mghio
Java	Frequent interview question - Please explain Java's parent delegation mechanism clearly!	Ijiran
Spring	A large company in Beijing: SpringBean life cycle k	Java3y
Java	Easy-to-understand ReentrantLock, if you don’t understand, come and kill me	Programmer Axing
Java	Interviewer: "Have you ever encountered a deadlock problem? How did it happen? How to solve it?"	Chengxiang Moying
Java	String s="a"+"b"+"c", how many objects are created?	coder ginseng
Java	Let’s talk about 12 scenarios of spring transaction failure. It’s too confusing.	Su San talks about technology
Java	The scumbag counterattack: JVM classic fifty questions, now the interview is stable!	The third child

database

type	topic	source
MySQL	Why is the paging scenario (limit, offset) slow?	Java Learner Community
MySQL	Talk about MySQL locks	Guo Er's trek
Redis	Good coding practice: lightweight distributed balanced consumption queue based on Redis	Alibaba technical team
Redis	Getting started with Redis: Redis concepts and basics (view original text)	Java full stack knowledge system
MySQL	The relationship between transaction isolation levels and locks in Innodb	Meituan technical team
MySQL	MySQL index principle and slow query optimization	Meituan technical team
MySQL	A brief discussion on sub-databases and tables	Alibaba technical team
MySQL	Synchronization solution for MySQL and Redis cache	Big brother of the people
MySQL	I almost always ask in interviews: What are your principles for designing indexes? How to avoid index failure?	Hollischuang
MySQL	Partition modulo and database sharding strategy: multi-table transaction sharding internal closed-loop solution	Ali Technology
Redis	How to design the Redis cache of a billion-level system? ? ?	TomGE
MySQL	Meituan 2nd Face: How to ensure the double-write consistency between Redis and MySQL?	Little boy picking up snails
MySQL	What are the scenarios for index failure? When does an index expire?	Migrant worker
MySQL	After reading this article, you still don’t understand MySQL master-slave replication, so you can go home and lie down ~	Xiao Yu
Redis	Quickly understand cache penetration and cache avalanche	Quancai engineer Xiaohui
MySQL	Interview question: How many pieces of data can a MySQL B+ tree store?	TomGE
MySQL	Why does the disk storage engine use b+ tree as the index structure?	Tencent Technology Engineering
Redis	Understand Redis persistence at the source code level	Mushrooms can't sleep
Redis	Classic interview question from a major company: Why is Redis so fast?	Little boy picking up snails
MySQL	Learn about data splitting and sub-database and sub-table in one article	Quancai engineer Xiaohui
Redis	[redis prequel] How zset solves the inefficiency of internal linked list search | Jump list construction	zxhtom
MySQL	Worth collecting, reveal the implementation principle of MySQL multi-version concurrency control	The road to architectural improvement
MySQL	Slow SQL troubleshooting ideas? That's it.	yes’s leveling guide
MySQL	42 pictures to guide you through MySQL optimization	Programmer emcxuan
MySQL	Two treatments that can easily cause avalanches	Programming for a lifetime
MySQL	A MySQL lock and the interviewer fought for thirty rounds, and I dominated!	yes’s leveling guide
MySQL	Understand MySQL index pushdown in five minutes	The third child
Redis	Essential information-16 pictures to understand the evolution of Redis architecture	IT
Java	Slow SQL governance classic case sharing	Ali Technology
MySQL	Cost-based optimization suggestions for slow queries	Meituan technical team

? Distributed && middleware

type	topic	source
distributed	Analysis and solution of mutual exclusivity and idempotence issues in distributed systems	Meituan technical team
Distributed lock	Understand the principle and implementation of distributed locks in one article	The road to architectural advancement
concurrent	[10,000-level concurrency] How to design e-commerce inventory deductions? Not oversold!	TomGE
Distributed transactions	Seven distributed transaction solutions, told to you at once	moon talks about technology
distributed	How to prevent duplicate payments on the server side	Markerhub
Current limiting	Why is the service concurrency of big manufacturers high but very stable? Distributed service circuit breaker downgrade current limiting tool to Hystrix	zxhtom
Distributed lock	SpringBoot + Redis distributed lock: simulate order grabbing	JAVA Xiaoka Show
message queue	How does the message queue ensure the orderliness of messages?	Du Yishu
message queue	Listen to my uncle's advice, the message queue is too deep and you can't control it!	single tone
Distributed lock	Damn, the guy next door asked me to use distributed lock again	Java3y
Dubbo	Detailed explanation of Apache Dubbo’s SPI implementation mechanism	Ning Peng
distributed	Ctrip eventually consistent and strongly consistent caching practice	GSF
Distributed lock	Distributed lock design based on Redis	xiaoxiaotank
distributed	Consistent hashing algorithm in distributed systems	Code architecture
information	How to solve message idempotence (duplication removal)? Come check out this plan!	JAVA Daily Record
local cache	Guava Cache principle analysis and best practices	Azusagawa
Distributed lock	A 10,000-word long article explaining distributed locks thoroughly	Many candies
Downgrade current limit	High concurrency overall availability: Detailed explanation of downgrade, current limiting and circuit breaker in one article	Coder’s technical journey
kafka	Why does Kafka abandon Zookeeper?	Bug Catching Master

? Data structure

type	topic	source
algorithm	Common primary sorting algorithms, understand them all this time	XSliently9527
algorithm	ByteDance’s favorite 64 algorithm questions (JS version)	tuque community
algorithm	The bottom layer of MySQL index: Detailed explanation of B+ tree	Java3y
algorithm	In-depth analysis of red-black trees and Java implementation	Meituan technical team
algorithm	The awesome BitMap, where is the awesomeness?	ITl bro
algorithm	bloom filter	DreamCats
algorithm	Implement LRU caching mechanism	Guo Er's trek
algorithm	Implement LFU caching mechanism	Guo Er's trek

computer network

type	topic	source
Jiwang	What is the essential difference between GET and POST requests? It turns out that I had understood it wrong all along.	Coders break out
Jiwang	Confused! Why do we need RPC when we have HTTP?	Xiaohaxue
Jiwang	"Handshake three times, wave four times" says this, I guarantee you will never forget it	Three points of evil
Jiwang	Ultra-detailed DNS protocol analysis	Flying veal
Jiwang	Cookie, Session, Token, JWT that are confusing to distinguish	No leaves fall in autumn
Jiwang	Brief illustration: Enter the URL to the page that appears. What does the browser do?	Shoot the clouds again

✉️Operating system

type	topic	source
system	Go to the ground floor and see NIO’s zero copy	Huangfu howled
system	Can't tell the difference between process, thread and coroutine? One article will guide you through it all!	Programmer Axing
system	That thing about virtual memory	Sylvassun
system	Tonight: What is the relationship between the number of CPU cores and the number of threads?	A coder's desert island survival
system	Talk about multi-process in operating system	ZhiboZhao
system	Ali Ermian: What is mmap?	Su San talks about technology

? Productivity tools

type	topic	source
writing	Picture bed, construction and use of uPic and Alibaba oss	Sisi
Git	Your file requires git, detailed installation and use (1)	Sisi
Git	Your file requires git, common commands (2)	Sisi
document	Mac solves the pain points of moving files-yoink	Sisi
picture bed	Management image bed-oss-browser	Sisi
terminal	Sometimes it’s flashy, sometimes it’s plain and simple-iterm2	Sisi
rss	Timely push-RSSHub	Sisi
vim	vim programming-a preliminary study (1)	Sisi
vim	vim programming-elegant (2)	dark night

? Source code reading

type	topic	source
nginx	Can't take any time - what is nginx? (one)	Sisi
nginx	Can’t take any time off-nginx environment setup (2)	Sisi
nginx	Can't take any time-global knowledge of nginx source code (3)	Sisi
nginx	Can’t take time off-nginx configuration file (4)	Sisi
nginx	No time to spare - nginx basic data structure (5)	Sisi
nginx	Can't take any time - nginx array structure (6)	Sisi
nginx	Can’t take any time-nginx linked list structure (7)	Sisi
nginx	No time to spare - nginx queue structure (8)	Sisi

? I learn design patterns

type	topic	source
design pattern	I learn design patterns - singleton pattern	Sisi
design pattern	I learn design patterns-factory pattern	Sisi

? Scenario questions

type	topic	source
data structure	How to design a map (1)	dark night
data structure	How to design a concurrent map (2)	dark night
data structure	How to design an LRU (3)	dark night
data structure	How to design a Bloom filter (4)	dark night
System design	How to design an idempotent solution (5)	dark night
Lock	How to design a read-write lock (6)	dark night
Lock	How to design a distributed lock (7)	dark night
Lock	How to design an optimistic lock (8)	dark night
Log in	The principle of QR code scanning and login (9)	dark night
Log in	Principle of mobile phone verification code login (10)	dark night
Log in	Principle of one-click login with mobile phone number (11)	dark night
Log in	App mobile phone number login distinguishes new users (12)	dark night
Order	Automatically update status when order expires (13)	dark night
counter	Implementation based on Redis counter (14)	dark night
MySQL paging	MySQL paging query optimization (15)	dark night
Current limiting algorithm	Leaky bucket algorithm implemented based on Golang (16)	dark night
Current limiting algorithm	Token bucket algorithm implemented based on Golang (17)	dark night
System design	How to design an order-sharing service (18)	dark night
System design	How to design short chain services (19)	dark night
System design	How to design a video barrage service (20)	dark night
MySQL	Problems caused by MySQL concurrent transaction writing (21)	dark night
Hot key	Problems with high concurrency and hot keys (22)	dark night
in stock	How to deduct inventory under high concurrency (23)	dark night

? Contact me

• Public Account (Dreamcats): Precipitate, share, and grow. Focus on original special cases and share knowledge in the easiest way to learn programming, so that you and others can gain something. Personal autumn recruitment experience, summary of customer interview questions according to frequency, a series of Java knowledge, database, distributed, microservices, front-end, technical interviews, daily articles, etc. (continuously updated)

• Mini program (online interview assistant): Contains interview experience, algorithm questions, and knowledge points from various major companies. The mini program also includes long-press copy and click picture preview functions. At the same time, the mini program continues to be optimized and developed.