Preface
The job-hopping season of gold, nine, and silver, ten in the workplace is in full swing. The difference is that this year's competition will be more intense than in previous years, and the form will be more severe.
For job seekers, the interview is a hurdle. Many people are afraid of interviews. Even veterans who have worked for many years may have interview anxiety.
Everyone may have heard or seen some information, that is, many companies are optimizing layoffs, but there are also many large companies that have released "expansion" information, such as Tencent, such as ByteDance.
One of my friends is a former Ali, 37 years old, and worked for Meituan after leaving. I used to vote for one face and one face, and I wanted to change jobs this year, but I didn't expect that it would be good to have two interview opportunities with ten votes. In the end, I simply returned to Ali to do the structure.
When he was interviewing, he met an interviewer who was older than himself, with a kind attitude, and he could usually pass the interview. And if you meet an interviewer who is much younger than yourself, he can ask you from the sky to the underground, as if you are saying, this is it? Can you not?
My colleague's statement: Whether he can get along with you, his age is bad. If you want to work under him and the age difference is big, he generally won't want it. The fundamental reason is that he can't control it .
Several other friends, all of whom are in the technical management post, are 35 years old, some are in NetEase, and some are in Didi. According to them, at this age, don't think about jumping anymore. Find a co-production company and do it well, mix in a higher position, go out and ask for a good price, and no one wants it.
Do you really think that the layoffs are those who are older and have more stocks? After graduation, there are also a few classmates and friends at Huawei. According to them, they are all those who have worked for more than ten years, are evaluated for ordinary ranks, and have low incomes and stocks. That is: the work of these people is substitutable .
Therefore, the layoffs are those three types of people:
- With a salary far exceeding three fresh graduates, but the ability is at most one.
- Old fritters, work is average, but oily.
- Can only write code, so professionalism and emotional intelligence.
**The fundamental thing is to improve one's own strength. **Because in the interview, all the outer packaging will be exposed.
For example, performance tuning, have you delved into the 2021 Baidu, JD, Tencent, Alibaba and other major manufacturers' performance tuning interview questions?
The underlying principle and performance optimization of Java virtual machine
1. Can you talk about the memory model of the Java virtual machine?
2. What is the parent delegation model of the class loader?
3. What are the JVM garbage collection algorithms and collectors?
4. Which JVM diagnostic and tuning tools have been used?
5. Why do GCs happen frequently in the spike system with hundreds of thousands of concurrent per second?
6. How to optimize the JVM for the daily average million-level trading system?
Mysql index data structure and performance optimization
1. Can you talk about the index data structure red-black tree, Hash, B+ tree?
2. How to find tables with tens of millions of data quickly using indexes?
3. How to accurately build a high-performance index based on the index B+ tree?
4. What is the underlying data structure of the joint index?
5. What exactly are covering index and clustered index?
6. What is the optimization principle of the leftmost prefix of Mysql?
BIO, NIO, AIO, Netty and Redis threading models
1. What is the difference between BIO, NIO and AIO?
2. What is blocking IO and non-blocking IO?
3. What are the Reactor and Proactor IO design patterns?
4. What is the difference between select, poll and epoll at the bottom of NIO?
5. What are the core components of Java NIO? What are the roles?
6. What is the connection between the threading model of Redis, Netty, Tomcat and NIO?
At last
It is said that three years is a hurdle for programmers, whether they can be promoted or improve their core competitiveness, these few years are very critical.
With the rapid development of technology, from what aspects can we learn to reach the level of senior engineer and finally advance to Android architect/technical expert? I have summarized these 5 big pieces;
I have collected and sorted out the interview questions of Alibaba, Tencent, ByteDance, Huawei, Xiaomi and other companies in the past few years, and sorted out the requirements and technical points of the interview into a large and comprehensive "Android Architect" interview PDF (in fact, more than Expected to spend a lot of energy), including the knowledge context + branch details.
Java language and principles;
big factory, small factory. Android interview first see if you are familiar with the Java language
Advanced UI and custom view;
custom view, the basic skills of Android development.
Performance tuning;
data structure algorithms, design patterns. All of the key foundations and key points need to be skilled.
NDK development;
future direction, high salary is bound to be.
Cutting-edge technology;
componentization, hot upgrade, hot repair, frame design
There are a lot of materials for learning Android on the Internet, but if the knowledge learned is not structured, and when you encounter problems, you just taste it and stop studying it in depth, then it is difficult to achieve real technological improvement. I hope that this systematic technical system will provide you with a direction reference.
When I was building these technical frameworks, I also sorted out the advanced advanced tutorials of the system, which will be much better than my own fragmented learning effect, visible on GitHub; "Android Architecture Video + Study Notes"
Of course, it is not easy to learn and master these abilities in depth. Everyone knows how to learn and what work intensity is as a programmer, but no matter how busy the work is, I have to spare 2 hours a week to study.
Within half a year, you will be able to see the changes!
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Of course, it is not easy to learn and master these abilities in depth. Everyone knows how to learn and what work intensity is as a programmer, but no matter how busy the work is, I have to spare 2 hours a week to study.
Within half a year, you will be able to see the changes!