It was almost time to go home and celebrate the Chinese New Year with my year-end bonus, but I still couldn't resist getting a sunburn. What was even worse was that the worker had a fever and was lying in bed, and he was still waiting for the layoff notice from HR...

They all say that the end of the year is sad, but now I really feel it!

It was almost time to go home happily with the year-end bonus to celebrate the New Year, but I still couldn't resist it. I got a sunburn . What was even worse was that the worker had a fever and was lying in bed, and he had to wait for the layoff notice from HR. ... A double blow to the body and soul, waiting for recovery and compensation, this process was too painful.

I am unemployed at the end of the year and there are not many opportunities. It is almost impossible to find a suitable job in a short time. When you feel well and stay at home, I mainly recommend that you do two things:

First: Organize your work experience and make a job search plan for the new year. Some good companies such as have released new hc. As soon as the market situation picks up, interviews will begin immediately.

Second: review interview eight-part essay and technical information. The purpose of is mainly to increase the probability of success in interviews, to prepare for getting a few more favorite offers, and to take advantage of this free time to make up for technical shortcomings.

I have just recently completed the technical aspect of Dachang must ask 's concurrent programming. I have gone through the knowledge of concurrent programming twice. I have also reviewed the real interview questions and coping skills. I have a comprehensive and systematic understanding of it.

today I will release my learning methods and materials, so that everyone can improve together and overcome difficulties together!

First of all, it is a super hard-core learning artifact - a copy of "Java Concurrency Implementation Principles Study Notes.pdf" shared by the boss to me

directly displays the directory

. The following will directly show you screenshots of part of the content. If you need to obtain this manual, you can directly forward it + follow it and send a private message (study) to get it for free!

multi-threaded basic

• thread graceful shutdown

1. stop () and destroy () function
2. daemon thread
3. sets the closed flag

• synchronized keyword

1. What is the object of the lock? What is the essence of the
2. lock?
3. synchronized implementation principle

• wait() and notify()

1. producer-consumer model
2. why must be used with synchronized
3. why wait () The lock must be released when
4. wait () Problems with notify ()

• volatile keyword

1. 64-bit write atomicity (Half Write)
2. memory visibility
3. reordering: DCL problem

• comprehensive application: lock-free programming

1. one-write-one-read lock-free queue: memory barrier
2. one-write-multiple-read lock-free queue: volatile keyword
3. multiple-write-multiple-read lock-free queue :CAS
4. no lock stack
5. no lock linked list

Atomic class

Lock and Condition

• mutex

• read-write lock

• Condition

• StampedLock

synchronization tool class

concurrent container

• BlockingQueue

The implementation principle of thread pool and Future

• thread pool

• class inheritance system of thread pool
• ThreadPoolExector

• Callable and Future

• ScheduledThreadPoolExecutor
• Executors tool class

ForkJoinPool

• ForkJoinPool usage

• work stealing queue

• work stealing algorithm: task execution process analysis

1. sequence Lock eqLock
2. scanGuard parsing

CompletableFuture

• CompletableFuture internal principle

• Mesh execution of tasks: directed Acyclic graph

Due to space limitations, this document has a total of 384 pages. I cannot show them all for you. I hope you will forgive me

is written at the end.

concurrency not only needs to consider issues such as static resources, deadlock , resource fairness, etc., but also often needs to consider performance issues . In some business scenarios, it is often more complicated. These are all important to Java. The coders caused quite a problem. If you have a certain understanding of the concurrent package, you can solve many problems. If you need a friend who needs Java concurrent JDK source code analysis, you only need to forward + comment. Follow and I will directly send a private message [ learn ] to get the high-definition version of the document 100% free!