Let me talk about my personal situation first. A junior college student, I entered Hunan Kingdee Software Company through school recruitment in 18 years and did CRUD for nearly 3 years. At the beginning of this year, I felt that I could not go on like this, staying in a comfortable environment for a long time would make a person degenerate! I have been working in an enterprise for three years as CRUD, which has made me unambitious. My girlfriend of two years also broke up with me because of my mentality and salary. So, I decided to change the status quo, looking at this year’s gold three silver four!

At the beginning of the preparation, I was completely confused. After 3 years of CRUD, I didn’t make any progress in my skills. The only improvement was my age.

I had no choice but to go to my mentor, who was his right-hand disciple. After he learned about my situation (almost from the beginning of Java), he just handed me a study note and said, “Go ahead, here is everything you need, don’t come to me, I’m ashamed!” .

Let’s see how powerful this note is! (Just began to think that the mentor in bragging force, the results directly to my mentor to kneel…)

Comprehensive Analysis of Advanced Core Knowledge in Java (524 pages) It is divided into eight parts and each part explains the core knowledge points in detail.

  • Part 1 Solid Java foundation (Java Foundation + Containers + Concurrency +JVM)
  • Part 2 Network Knowledge (Computer Network Technology + TLS in HTTPS)
  • Part 3 Linux
  • The fourth part is data structure and algorithm
  • Part 5 Database (MySQL+Redis)
  • Part VI System design (RestFul API+ Common framework + Authentication and authorization + distributed + large-scale website architecture + micro services)
  • Part 7 Required Tools (Git+Docker)
  • Part 8 Interview Guide (How to write a RESUME + How to prepare for an interview + My Learning Method)

As the whole note is more comprehensive, the content is quite much, here only show some screenshots of the information, if there is a need to obtain the article mentioned in the “Java advanced core knowledge comprehensive analysis” friends have direct access to the end of the address.

Part 1 Java

(I). Basis

1. Java basic skills

  1. Getting started with Java (Basic Concepts and General Knowledge)
  2. Java syntax
  3. Basic data types
  4. Method (function)

2. Java object-oriented

  1. Classes and objects
  2. Three characteristics of object orientation
  3. The modifier
  4. Interfaces and abstract classes
  5. Other important points

3. Java core technology

  1. A collection of
  2. abnormal
  3. multithreading
  4. Files and I\O streams

(II) containers

1. ArrayList

  1. ArrayList profile
  2. ArrayList core source code
  3. ArrayList source code analysis
  4. ArrayList classic Demo

2. LinkedList

  1. Introduction to the
  2. Internal structure analysis
  3. LinkedList source code analysis
  4. LinkedList class common method tests

3. HashMap

  1. Introduction of a HashMap
  2. Analysis of underlying data structures
  3. HashMap source code analysis
  4. The get method
  5. The resize method
  6. Common HashMap method tests

(c) concurrency

1. Concurrent containers

  1. Summary of concurrent containers provided by the JDK
  2. ConcurrentHashMap
  3. CopyOnWriteArrayList
  4. ConcurrentLinkedQueue
  5. BlockingQueue
  6. ConcurrentSkipListMap

2. The thread pool

  1. The benefits of using thread pools
  2. Executor framework
  3. (Important) An introduction to the ThreadPoolExecutor class
  4. (Important) Example of ThreadPoolExecutor usage
  5. Several common thread pools in detail
  6. ScheduledThreadPoolExecutor,
  7. The thread pool size is determined

3. Optimistic and pessimistic locks

  1. What is the pessimistic lock and optimistic lock
  2. There are two common implementations of optimistic locking
  3. Disadvantages of optimistic locking
  4. The use of CAS and synchronized

4. Atomic

  1. The Atomic class is introduced
  2. Base type atomic class
  3. Array type atomic class
  4. Reference type atomic class
  5. Object property modification type atomic class

5. AQS

  1. AQS brief introduction
  2. AQS principle
  3. Semaphore – Allows simultaneous access by multiple threads
  4. CountDownLatch
  5. CyclicBarrier
  6. Already and ReentrantReadWriteLock

(4). The JVM

1. Java memory area

  1. An overview of the
  2. Runtime data area
  3. HotSpot VIRTUAL machine object Exploration
  4. Key supplementary content

2. JVM garbage collection

  1. Demystify JVM memory allocation and reclamation
  2. The subject is dead?
  3. Garbage collection algorithm
  4. Garbage collector

3. JDK monitoring and troubleshooting tools

  1. JDK command line tools
  2. JDK visual analysis tools

4. Class file structure

  1. An overview of the
  2. Class file structure summary

5. Class loading process

  1. Class loading process
  2. uninstall

Class loaders

  1. Review the class loading process
  2. Class loader summary
  3. Parental delegation model
  4. Custom class loaders

Second, the network

(I) Computer network knowledge

  1. Computer Overview
  2. The physical layer
  3. Data link layer
  4. The network layer
  5. Transport layer
  6. The application layer

(2) TLS in HTTPS

  1. The SSL and TLS
  2. Understand HTTPS from a network protocol perspective
  3. Understand HTTPS from a cryptographic perspective
  4. Simple RSA Examples

Third, the Linux

(A). Start by understanding the operating system

  1. Operating System Introduction
  2. Simple classification of operating systems
  3. Kernel of the operating system
  4. User mode and kernel mode of the operating system

(2). A preliminary study of Linux

  1. Linux introduction
  2. Introduction to the Birth of Linux
  3. The classification of the Linux

(3) Linux file system overview

  1. Introduction to the Linux file system
  2. Inode
  3. File type and directory structure
  4. The Linux directory tree

4. Linux basic commands

  1. Directory switch command
  2. Directory operation commands (add, delete, modify, and search)
  3. File operation commands (add, delete, modify and check)
  4. Command to compress files
  5. Linux permission command
  6. Linux User Management
  7. Linux user group management
  8. Other Common Commands

4. Data structure and algorithm

(I). Data structure (Bloom filter)

  1. What is a Bloom filter?
  2. The principle of Bloom filter is introduced
  3. Application scenario of bloom filter
  4. Implement bloom filter manually through Java programming
  5. Use the Bloom filter that comes with Google’s open source Guava
  6. Bloom filter in Redis

V. Database

(一). MySQL

  1. Basic operation
  2. Database operations
  3. The operation of the table
  4. Data manipulation
  5. Character set encoding
  6. Data type (column type)
  7. Column attributes (column constraints)
  8. Build specification table
  9. SELECT
  10. UNION
  11. The subquery
  12. Join query
  13. TRUNCATE
  14. Backup and Restore
  15. view
  16. Transaction (transaction)
  17. Lock table
  18. The trigger
  19. SQL programming
  20. The stored procedure
  21. User and permission management
  22. Table maintenance
  23. miscellaneous

(二). Redis

  1. Five basic data structures
  2. Jump table
  3. A deep dive into distributed locks
  4. Redlock Distributed lock
  5. How to make reliable distributed locks, does Redlock really work
  6. Magical HyperLoglog solves statistical problems
  7. Billion data filter and Bloom filter
  8. GeoHash looks for people nearby
  9. persistence
  10. Publish subscriptions with streams
  11. [cluster] getting started practice tutorial
  12. Redis data type, encoding, underlying data structure

6. System design

(1).restful apis

  1. Important concepts
  2. REST Interface specifications
  3. HATEOAS

(2). Common framework

  1. Spring FAQ
  2. Spring Spring
  3. The Spring transaction
  4. Spring IOC and AOP details
  5. The scope and lifecycle of beans in Spring
  6. SpringMVC works in detail
  7. What design patterns are used in Spring?

(III) Authentication and Authorization (JWT, SSO)

  1. Advantages and disadvantages of JWT authentication and solutions to common problems
  2. SSO SSO

(4) distributed

  1. Introduction to distributed related concepts
  2. Dubbo
  3. Message queues are simple
  4. RabbitMQ
  5. RocketMQ
  6. Kafka
  7. API gateway
  8. A distributed ids
  9. What are the algorithms for limiting traffic?
  10. Zookeeper

(v). Large website architecture

  1. How to design a high availability system? What places to consider?

(vi) Micro services

  1. Spring Cloud

Seven, must know tools

(a). The Git

  1. Version control
  2. Know the Git
  3. Git quick start

(二). Docker

  1. To know the container
  2. Let’s talk about some of the concepts of Docker
  3. Container VS VIRTUAL machine
  4. Docker basic concepts
  5. Common command
  6. Build Ship and Run
  7. A brief overview of the underlying principles of Docker
  8. conclusion

Interview guide

1. How to write a programmer’s resume

  1. Why is a resume important?
  2. Here’s what you need to know
  3. There are two rules you must know
  4. How about the project experience?
  5. How do you spell professional skills?
  6. Typesetting Considerations
  7. A few other tips

(2) How to prepare for the interview

  1. How to get a big factory interview?
  2. Preparation for an interview
  3. Review after interview
  4. How to learn? Is it necessary to learn frameworks?

(3) Java learning route and method recommendation

  1. Java based
  2. Operating systems and computer networks
  3. Data structures and algorithms
  4. The front-end knowledge
  5. MySQL
  6. Commonly used tools
  7. Common framework
  8. Simple use of multithreading
  9. distributed
  10. Learn more
  11. Micro service
  12. conclusion

Write in the last

I didn’t even know all of the above. I only knew 80% of the above points, and I was able to get a big raise, even though I gave up all my rest time in the process of studying and even spent all my time studying at work (sitting for a long time without exercising, and I even got hemorrhoids…). But I think it was worth it. I sacrificed 3 months, and what I gained is not only a salary increase of nearly 9K a month, but also a hard study and positive attitude!

Are there many friends like me who are content with the status quo, boiling frogs in warm water, and reluctant to make changes? They have been doing CRUD in a company, and when they want to make some changes, they find that CRUD takes up all their time. Working for several years only increases their age, technology has remained at the day when they joined the company, and even there is a slight regression.

Dare not raise salary, also not qualified to raise salary. Someone younger than you is more skilled than you, and there’s only one way to get laid off!

I hope you can always keep a positive heart, I always believe one thing: opportunities are always for those who are prepared.

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