Due to the sudden outbreak of the virus and the growing tension between China and the US, Xiao K decided to return to China to find a job on the agenda.
However, The young K, who is supported by the status of overseas returnees, met with a failure: although he successively got the interview opportunities of Ali, Byte and Meituan, he did not even receive the reply notice, let alone the offer.
Just when small K most confused and helpless, nine chapter algorithm “Java senior engineer P6+” Yang Xiao teacher directly gave small K a blow in the head:
✎ Tip 1
The unspoken rule of domestic large factory recruitment is that the ability requirement rises one level, the rank assessment drops one level. So if you want to get P6, you have to apply P7 standards to yourself.
Among them,Highly available architectureVery important at home,JVM principles and optimizationWith foreign difference also compares big, should key study.
△ Knowledge system required by P5-P7
✎ Tip 2
Striving for a position in Dachang Java should not stop at the use of program language and coding, high-quality code ability is the key to get offer from Dachang.
This ability requires a deep understanding of the principles behind the code.
It is not difficult to see that domestic job hunting will only brush the question is absolutely not feasible, we must be well versed in the interview style and inspection standards of large factories, according to the interview requirements to improve their abilities.
Therefore, Teacher Yang Xiao helped K to re-plan the path of job hunting and learning, and focused on the knowledge of high availability architecture, JVM principle and optimization, which are most valued in domestic interviews.
After 6 weeks of systematic learning, Xiao K has successfully got the offer from Ali!
An original problem, uncover the big factory recruitment routine
Different job hunting environment at home and abroad, interview characteristics are also different, like K returned to the situation of failure is very common.
In view of this situation, Ali P8 interviewer Yang Xiao and Facebook E5 architect Linghu Chongteacher jointly launched ** Java Senior Engineer P6+ **, in-depth analysis of domestic interview methods, analysis of ali and other BAT manufacturers required to test the technology and algorithm principle.
Teacher Yang Xiao shared an interview question from Alibaba to reveal the interview routine of a big factory with a real case:
What classes are available for manipulating strings in Java? What’s the difference between them?
The average person sees this question all feel stable, answer quickly:
They’re String, StringBuffer, StringBuilder. The difference is that String declares an immutable object, and each operation must produce a new object. StringBuffer is thread-safe. Concurrent StringBuffer is mandatory, iterated StringBuilder is mandatory, and String is optional in common scenarios to avoid unnecessary conversion overhead.
What the interviewer is really looking for is a deeper answer:
Abstractbuffer and StringBuilder both inherit from the abstract class AbstractStringBuilder!
Plus, if there is a source interpretation of String, bonus points!
Final decoration — > immutable — > generates a new String for each operation, contrasting StringBuffer with StringBuilder — > variable value, concatenated String overhead.
Then the interviewer asks:
Why aren’t the other two classes thread-safe?
It’s easy to see that StringBuffers are thread-safe by looking at the source code and looking at synchronized and thread locks.
That’s more than 95% of you, but your interviewer may still be asking:
Since StringBuffer is thread-safe and has low iteration overhead, is it ok to prefer it in practice?
…
This is the basic routine of interviewing Java programmers in big factories – start with simple questions, and then slowly dig behind the principle, so as to judge the technical level of the candidate, the purpose is to examine the deep awareness of the source code.
This course is very practical. The design concept of this course is to “complete the BATJ Interview with real questions”. Through 40 days of planned training, this course will take you to the ALI P6+ level.
SpringBoot project combat, reducing dachang development scene
For students with a certain language foundation, another difficulty in preparing for the interview is that they have not been exposed to the real development scenes of big factories and lack the ability of system analysis and architecture.
“Java Senior Engineer P6+This course will take you through the projectSystematic SpringBoot project teaching **, take you to restore alibaba’s most real development scene, the establishment of their own SpringBoot project.
Break the career bottleneck, aiming at dACHeng 40W + annual salary
Many Java engineers who have worked for 3 years or so will fall into the bottleneck of career development. For example, many employees of Ali are stuck in the path of P6 or P7, and some students who want to move to big factories for high P positions always fail.
Yang Xiao, a technical expert of Ali P8 with 10 years of development experience, has interviewed more than 500 people and found that these job seekers more or less have the following three common problems:
※ Limited to the development skills of adding, deleting, checking and revising, lack of careful preparation for technical in-depth topics;
Java skills are not systematic and are limited in dealing with issues of breadth and principle;
※ Lack of on-site interview experience, clearly know the technical principle but do not know how to express.
In order to help you break through the bottleneck and earn a high salary, “Java Senior Engineer P6+” course will start from the breadth and depth of technology, through practical training through knowledge to help you improve in all directions.
Other students will ask: What kind of offer can I get after this course?
📌 The goal of our training is to understand the principle, know the source code, can brush questions, can build a high availability architecture of senior engineers/architects
📌 The standard salary of our students is 40~ 100W per year
△ Alibaba rank and corresponding salary range
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First live time
Beijing time: 2020-09-19 (This Saturday) 20:00 EST: 2020-09-18 08:00