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In 2021, someone finally sorted out the knowledge points that Java programmers must learn, which makes people feel like they are full of inspiration!

JVM

No matter what level Java practitioners ,JVM It's all the hurdles that we have to step over in order to advance . Whether it's a job or an interview ,JVM They are all required questions . If you don't understand JVM Words , The pay will be very bad ( near 70% Of the interviewers hanging on JVM Yes )

In detail JVM Thread is about 、 Memory model 、JVM Run time memory 、 Garbage collection and algorithm 、Java There are four types of references in 、GC Generational collection algorithm VS Partition collection algorithm 、GC Garbage collector JAVA IO/NIO 、JVM The knowledge of class loading mechanism .

Basic concepts :

JVM Can be run Java Hypothetical computer of code , Includes a set of bytecode instructions 、 A set of registers 、 A stack 、 A garbage collection , Pile up and A storage method domain .JVM Is running on the operating system , It's not directly related to hardware Interaction .

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

There are too many details , The copy is too long 《Java Core knowledge system 》

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

JVM Catalog

Java aggregate

Usually , Our program needs to know how many objects to create according to the program runtime . But if it's not a program running , Program development stage , We have no idea how many objects we need , I don't even know its exact type . In order to meet these routine programming needs , We want to be able to , Create any number of objects anywhere , And what do these objects contain ? We think of arrays first , But arrays can only hold data of the same type , And its length is fixed , Then what shall I do? ? The assembly came into being !

  • 1、 Interface inheritance and Implementation
  • 2、List
  • 3、Set
  • 4、Map

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

Java Set frame diagram

There are too many details , The copy is too long 《Java Core knowledge system 》 There is a detailed decomposition of the set graph, which corresponds to each knowledge point ( See table of contents )

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

Java Multithreaded concurrency

Let's take a look at the concurrent repository architecture :

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

  1. Java Thread realize / How it was created ?
  2. 4 Thread pool ?
  3. Thread life cycle ( state )
  4. Thread termination 4 Ways of planting
  5. sleep And wait difference ?
  6. start And run The difference between ?
  7. Java Background thread
  8. Java lock
  9. Thread basic method
  10. Thread context switch
  11. Synchronization lock and deadlock
  12. Thread pool principle
  13. Java Blocking queue principle
  14. CyclicBarrier、CountDownLatch、Semaphore Usage of
  15. volatile The role of keywords ( Variable visibility 、 No reordering )
  16. How to share data between two threads ?
  17. ThreadLocal effect ( Thread local storage )
  18. synchronized and ReentrantLock The difference between
  19. ConcurrentHashMap Concurrent
  20. Java Thread scheduling used in
  21. Process scheduling algorithm
  22. The concept and characteristics of thread

There are too many details , The copy is too long 《Java Core knowledge system 》 There is a detailed decomposition of the set graph, which corresponds to each knowledge point ( See table of contents )

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

spring In depth analysis of principle

Spring With its many advantages, it is adopted by more and more micro service practitioners , Get the hang of Spring, Can become a leader in rapid application development . However, we should know why , This article will start from Spring Source code and core implementation principles to help you understand Spring The mechanism behind it .

Introduction table of contents

  1. Spring Characteristics
  2. Spring Its core components
  3. Spring Common modules
  4. Spring Main package
  5. Spring Commonly used annotations
  6. Spring IOC principle
  7. Spring APO principle
  8. Spring MVC principle
  9. Spring Boot principle
  10. JPA principle
  11. Mybatis cache
  12. Tomcat framework

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

There are too many details , The copy is too long 《Java Core knowledge system 》 There is a detailed decomposition of the set graph, which corresponds to each knowledge point ( See table of contents )

Forward this article, pay attention to my private message reply 【 Structure data 】 How to obtain consultation 《 Core knowledge 》 The way

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

spring principle

Microservices

Microservices are the knowledge you have to master in the Internet industry today , It is also the most popular knowledge at present , Let's have a look !

  1. Service registration found
  2. API gateway
  3. Configuration center
  4. Service tracking
  5. Service failure
  6. API management

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

There are too many details , The copy is too long 《Java Core knowledge system 》 There is a detailed decomposition of the set graph, which corresponds to each knowledge point ( See table of contents )

Forward this article, pay attention to my private message reply 【 Structure data 】 How to obtain consultation 《 Core knowledge 》 The way

Private letters can't be answered in time , You can click on the portal directly :《Java Core knowledge points 》 Get the address for free

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

Because the copy is too long , I will not introduce you here , Core knowledge summary knowledge points in addition to this, there are also Netty And RPC 、 The Internet 、 journal 、Zookeeper 、Kafka 、RabbitMQ 、Hbase 、MongoDB、Cassandra 、24 Design patterns 、 Load balancing 、 database 、 Consistency algorithm 、Java Algorithm 、 data structure 、 Distributed cache And so on .

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

 

This knowledge system is suitable for all Java Programmers learn , There are detailed explanations and introductions about the knowledge points in the above catalogue , Mastering all the contents of this knowledge point will improve you qualitatively , It also summarizes many questions encountered in the interview process and the corresponding answers .

Forward this article, pay attention to my private message reply 【 Structure data 】 How to obtain consultation 《 Core knowledge 》 The way

Private letters can't be answered in time , You can click on the portal directly :《Java Core knowledge points 》 Get the address for free

 Finally someone put Java The programmer must learn knowledge, and the points are sorted out , It's like a great shock

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