Today, I met an Ali P8 programmer in the group. It was very interesting to talk. After chatting with him for an afternoon, I finally knew where the gap between me and him is.
In terms of work, ordinary programmers and advanced programmers generally have the following differences:
Ordinary programmer:
1. The knowledge system is fragmented, there is no systematic thinking, and there is no engineering literacy when writing code and fixing bugs.
2. The dependence on a certain language is too strong, and the knowledge cannot be transferred well. Once the language is changed, or the field is different, it will be overwhelmed
3. Inexperienced but I think I have rich experience, I only feel comfortable with what I have done, but I am helpless when encountering unknown problems
Advanced Programmer:
1. The knowledge system is complete and systematic thinking. If you are not at the level of an architect in time, you can think and grasp as a whole when writing code and fixing bugs.
2. Strong learning ability With its own mental model, knowledge can be freely transferred and can be efficiently cut into different fields and languages
Third, have real experience, not just enough of those projects, but the ability to solve problems facing the unknown.
Under the premise that there is no shortage of ability, the main difference is that the essence of the problem cannot be grasped. Most of the ordinary programmers think in a straight line. If I don't want to type include on the computer, I type thousands of lines a day. Senior programmers are better at grasping the essence of the problem, simplifying seemingly complex requirements into a series of simple logic stacks, writing code step by step, the logic is simple and clear, all conditional branches are carefully covered, and the sharpening is correct. Woodcutter.
To put it simply, it is also a project requirement. Ordinary programmers may have to work overtime every day for a month, while senior programmers can get off work on time every day and get it done in a few days. This is why there is an embarrassing situation of "programmers with a monthly salary of 5,000 work overtime until night every day, and programmers with a monthly salary of 50,000 get off work at 5 o'clock". The company pursues profit rather than effort, and whoever creates more will of course get more.
Finally, the old man sent me a comprehensive analysis of Java intermediate and advanced knowledge with a star of 120k on GitHub. It 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, must-have tools, interview guide, etc. It is very comprehensive. Let me share it with you guys.
Share for free! 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.