1. Preface (self-introduction)
To make a long story short, I graduated from a technical college in Hunan because I failed the college entrance examination because of high school. For me who graduated from junior college, because of the disadvantages of academic qualifications, I only dared to choose a small company that was just starting out to start work in 1996. I originally thought that I would spend my whole life with a three-point line of life. It wasn't until the changes in my life that I had new ideas and goals. Therefore, I, a scum from college, also struggled and won the offer of Ali. Then I want to share this experience so that those who are troubled by academic qualifications like me can have a new understanding of career and technical planning, thank you!
Of course, I have compiled many documents and books for this interview, including many PDF documents, such as the interview question bank (including answers + analysis), study notes, actual documents and brain maps, which can be recommended for your reference. All are free to share.
One-click triple + comment, and then add my VX (tkzl6666) to receive it for free.
Two, Alibaba's four core interview questions
one side:
1. The underlying implementation and differences of hashmap and concurrenthashmap;
2. The principle of spring framework;
3. How to write an orm framework?
4. Hibernate first-level cache and second-level cache, hibernate other caches;
5. Types of hibernate transaction propagation behavior;
6. The principle of springmvc;
7. The benefits of restful;
8. There are several kinds of requests in restful, how to submit the put request in the form?
9. How to prevent security issues in the web?
10. The overall architecture of the web system;
11. How does hibernate implement declarative transactions?
12. Java concurrent package;
13、volatile；
14. Which books do you usually read?
15. Spring underlying data structure?
16. How to perform reflection and how to improve the performance of reflection?
17. How to implement java proxy and why do I need to implement an interface?
18. Three-way handshake of TCP protocol?
19. What annotations has springmvc used?
20. Which proxy can be used in springAOP and what is the difference?
21. Why is it divided into three layers?
22. What is the difference between mybatis and hibernate, why not write sql statement directly with hibernate?
Two sides:
1、hashmap,hashtable区别。
2. Have you ever understood the source code of hashmap?
3. JVM related, mainly the process of memory allocation. When will GC be triggered, and what tools or commands are used to monitor?
4. Class loading and class isolation mechanism.
5. Spring's ioc, aop, things, and then mentioned database things by the way, two-phase commit, the level of database locks, the special features of MySQL database locks (page-level locks)
6. The purpose and difference of arrayblockingqueue and linkedblockingqueue in java thread pool.
7. The design pattern is related, mainly explaining how to ensure the uniqueness of the ID in the database cluster, assuming that it is concurrently 200,000 times per second.
8. How to calculate the number of ecs used when designing a 100,000 concurrent-level website backend;
9. The similarities and differences and uses of memcached and redis.
10. Nosql database related, mainly talking about mongodb
11. Among the integers of 10G, take the largest one;
12. The use and advantages and disadvantages of synchronized, volatile, and reentrant locks.
13. Basic understanding and application of java nio related core api
14. Consistency hash
15. What single points of failure exist in a large system?
16. Hadoop optimization related
Three sides:
1. What is restful web service?
2. Concurrent collection package?
3. What data structures are used in the project?
4. TCP interrupts the connection and waved four times?
5. MD5 with salt;
6. https related;
7. Alipay interface development;
8. Know which locks and what is the difference?
9. Still JDK source code;
10. What problems did the project encounter and how to solve them?
11. What are the new features of JDK1.8?
12. Talked about career development and career planning;
HR surface:
1. Introduce yourself, grab the point of introduction and let you talk in detail?
2. Why not find other companies?
3. Other interview procedures?
4. Considering where to work, is Beijing the only option?
5. Why come to Ali? How much do you know about the Alibaba technical team?
3. Answers to Alibaba Interview Questions
Due to space issues, the answers to the interview questions are organized in a pdf file. If you need the answers to the interview questions,
One-click triple + comment, and then add my VX (tkzl6666) to receive it for free.
Interview answer
4. Summary of the success of this interview
1. Mindset (confident mentality)
We cannot deny our potential because of our low academic qualifications. We must believe that we can do it and we must know that we are now a society that values more ability. Self-confidence is the foundation of all success. Only if you believe in yourself, others can believe in you. Once a person denies himself from the bottom of his heart, the interview process is prone to lack of fluency, illogical speech, unclear organization, and incomplete answers. These are the "fatal injuries" that many interviewers are prone to appear in interviews, so believe in yourself. It is very important to face calmly.
2. Collect and organize test questions analysis
For us, if we want to grow into an industry leader, the only way is to continuously improve our skills, broaden our knowledge, and reach a certain height and depth through learning. Of course, we don't know what the interviewer will ask, so it is necessary to have a clear combing of the knowledge points of Java. Organize some interview questions for practice, and organize and adjust the core knowledge of Java clearly.
The following is my collation and hope to help you:
Java part: Java basics, collections, concurrency, multithreading, JVM, design patterns
Data structure algorithm: Java algorithm, data structure
Open source framework part: Spring, MyBatis, MVC, netty, tomcat
Distributed part: architecture design, Redis cache, Zookeeper, kafka, RabbitMQ, load balancing, etc.
Microservice part: SpringBoot, SpringCloud, Dubbo, Docker
Spring family bucket + Redis, etc.
Other related e-books: source code + tuning
Of course, you have to brush more questions. After all, many questions have a certain commonality. If you brush enough questions, you can draw inferences from one another. Even in the interview, when you are asked the original question, you can talk freely. So find more original interview questions over the years, and train yourself by topic. For example, this is an interview question I compiled myself:
Interview Question Bank
Four, concluding remarks
For interviews with major factories, I want to emphasize that self-confidence is really important. It is the key to determining your performance in the interview process. It will determine whether you can perform exceptionally during the interview. Otherwise, it is likely that you will miss the offer because of a small mistake. , So we must pay attention to it. Another reminder, full review is the key to eliminating your nervous state of mind. As long as you review enough, you will naturally have more confidence in the interview process.
All the study materials and interview materials in the above content can be provided free of charge. I hope everyone can have a smooth interview and win your favorite offer!