beginning
Learning ability, especially self-learning ability. When do you see those famous program masters asking questions like "what books to read when learning XX, how to quickly learn XXX, and what code recommendations for learning XXX", they want to learn What can I find relevant information soon. The industry is developing too fast, and the speed of technology obsolescence is also fast. If you don't learn new things for three years, you may be out of date.
Practical ability is all about reading books and reading materials. When others are still entangled in what books to read and what the words in the book mean, some people's hundreds or thousands of lines of code can already run.
Patience and perseverance are important to be a programmer. It is quite enjoyable to write your favorite code, but there are still a lot of boring and boring things in program development anyway. You must be able to persevere and grit your teeth to finish.
Ability to express, able to speak clearly and fluently of one's thoughts in a large public, so that people can understand.
What about technology? Technology is not important. With the above-mentioned capabilities, what technology is needed in the market will soon be mastered.
Finally, let’s talk about wages and remember two sentences:
Salary is not the boss’s return to your past contributions but the expectations of your future contributions.
The current boss cannot give you a satisfactory salary, the next boss will only.
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 I would have two interview opportunities if I voted for ten. In the end, I simply returned to Ali for 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 were a few classmates and friends who worked at Huawei. According to them, they were all those who had been working for more than ten years, were evaluated for average ranks and low incomes and stocks. That is: the work of these people is substitutable .
Therefore, the layoffs are these 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 red-black tree, Hash, and B+ tree of the index data structure?
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 design patterns of Reactor and Proactor IO?
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
Taking into account the length of the article, I made these questions and answers, as well as the questions I encountered in many years of interviews, and some interview materials into PDF documents. If you need a friend, you can send a private message to me [Interview] for free
Click here to receive a summary of Android interview materials
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