When I just graduated from university in 2016, I was looking for a job and hit a wall. I was in a low mood. I invested in the recruitment app, but only one outsourcing company responded to me. I used a computer video interview and asked a few simple questions, and I passed it smoothly!
Now it seems that I made a wrong choice. After entering for a period of time, I found that the technology I had access to was very limited. I thought it was a platform for growth, but the result was CRUD that was repeated every day. The director has made progress, but it is far behind the peers outside.
Over the past few years, seeing that the income of my friends who are also programmers has risen year by year, while my own remuneration is far less than that of my peers outside, the garage is hopeless, so I began to plan to change jobs.
In October last year, I found an old classmate. When I was drinking with him, I learned that he has a cousin who is Ali P7, so I went to WeChat to learn from it. After chatting, I clearly felt that the gap is huge, not only in terms of technology, but also in structure.
After he learned about my situation, he said that I had better prepare for this year's gold three silver four, and then gave me a "JAVA growth note", which mainly includes Java foundation, Java container, Java concurrency, Java virtual machine and Java IO. In addition, it also comes with network, linux, data structure and algorithm, database, system design, necessary tools, interview guide, etc., which is very comprehensive.
After a few months of study, I have grown a lot, and now I have successfully received a 20K offer from an Internet company. It is also shared here for everyone to see, I hope it can be helpful to everyone.
This time it's free to share! Some screenshots are shown below, click the business card at the end of the article, scan the code to get it for free!
(1). Basics
1. Basic Java skills
- Introduction to Java (basic concepts and common sense)
- Java syntax
- basic data type
- method (function)
2. Java Object Oriented
- classes and objects
- Three characteristics of object-oriented
- modifier
- Interfaces and Abstract Classes
- Other important knowledge points
3. Java core technology
- gather
- abnormal
- Multithreading
- Files and I\O Streams
(2). Concurrency
1. Concurrent containers
- Summary of concurrent containers provided by JDK
- ConcurrentHashMap
- CopyOnWriteArrayList
- ConcurrentLinkedQueue
- BlockingQueue
- ConcurrentSkipListMap
2. Thread pool
- The benefits of using thread pools
- Executor framework
- (Important) A brief introduction to the ThreadPoolExecutor class
- (Important) ThreadPoolExecutor usage example
- Detailed explanation of several common thread pools
- ScheduledThreadPoolExecutor 详解
- Thread pool size is determined
3. Optimistic locking and pessimistic locking
- What is pessimistic locking and optimistic locking
- Two common implementations of optimistic locking
- Disadvantages of optimistic locking
- Usage scenarios of CAS and synchronized
(3). JVM
1. Java memory area
- Overview
- runtime data area
- Exploring HotSpot Virtual Machine Objects
- key supplementary content
2. JVM garbage collection
- Demystifying JVM memory allocation and recycling
- Subject has died?
- Garbage Collection Algorithms
- garbage collector
3. JDK monitoring and troubleshooting tools
- JDK command line tools
- JDK Visual Analysis Tool
(4) Network, linux, data structure and algorithm, database, system design, necessary tools, interview guide
Due to the limited space, other content will not be shown one by one. This advanced notebook has a total of 512 pages. It should be very helpful for those who want to advance, and I hope it can also help you.
Those who need it can click the card below to get it for free.