Foreword
Each programmer has a giant's dream, and the Internet giant Alibaba is naturally bear the brunt of the most popular, today small to share into a guy's face by Alibaba!
"Do not want into the giant ape programmer not a good program," Ha ha ha
After the Spring Festival, this is a gold and three silver four occasion, most people are ready for this finding a copy of your favorite work in two months, but since the year 2020 some special, pneumonia outbreak, our work and life have caused a great impact. So, is not the case, we do not work, do not learn of it? In fact, precisely because of the spread of the virus during infection Now is the time, so we stay home to learn is no better. For Java programmers, use two to three months time, study hard, preparing for them, until the epidemic better, the beginning of the interview, you will not be timid.
I am also ready for six months, finally got his wish to get Ali offer!
Personal situation
I am an ordinary two non-undergraduates, more than three years to develop (Java back-end), usually also more inquisitive learning, it is also extremely serious and responsible attitude towards work, to work himself into giant still very confident, my direction is Java, Java also know that the more intense competition, manufacturers more difficult to enter, but I have no fear. For this reason also half a year ago to begin preparations for the beginning of this year pushed with their own efforts to review and knowledge also got his wish success to get Ali's offer in a big brother!
Special thanks to the help and push the big brother to me in the offer!
Java middleware side
1. The technical side of the scope of the study:
● Java threads emphasis asked lock: synchronized and associated with the underlying implementation ReentrantLock
● The underlying thread pool implementation as well as common parameters
● Data structures are basically asked - over: linked lists, queues, etc.
● Java Memory Model : frequently asked JVM generational model, and the difference between the JDK1.8, finally asked the relevant JVM
tuning parameters
● implement distributed lock comparison
2. technical side:
1. self-introduction
2. what aspects of good technology ?
3. What lock types are the Java? (optimistic locking & pessimistic locking, the Synchronize & reentrant lock, etc.)
4. the important data structures, such as a basic understanding of linked lists, queues, stacks and substantially implemented
common under the category 5. JUC usage of. In-depth study of ThreadPool; BlockingQueue use of
6. Java memory generational model, GC algorithm, JVM common startup parameters; CMS algorithm process.
7. volatile keyword what is the use (including the underlying principle)
8. The thread pool tuning strategy
9. spring cloud service registration and discovery is how the design?
How Global 10. The distributed system id realization
11. Distributed Lock the program, redis and zookeeper which is good, if it is clustered deployment, which the performance of concurrency
better.
Java Middleware two faces
1. The technical scope of the study two faces:
● Q project technical implementation details associated
database relevant: Index Index underlying implementation, mysq associated row locks, and other lock table
● Related Redis: architecture, data - induced problems
● container: container design principles, etc.
2. technical two faces:
1. participate in the project, choose a technical difficulty where?
2. Sort Collections.sort underlying
principle of load balancing 3.
4. design patterns and refactoring, talk to your reconstituted appreciated
5. talk Redis cluster associated with a program which matured?
6. talk again -? - induced hash algorithm (Redis)
7. the database index, characteristics and merits of the B + tree process.
8. mysq | related row locks, table locks; optimistic locking, pessimistic locking
9. talk about the use of multi-threading and concurrency tools
10. Redis talk about the architecture and components
11. Redis data consistency (multi-node distributed environment & stand-alone environment)
12. The container Docker
Java middleware on three sides
1. The technical scope of the study on three sides
● mainly talked about the implementation of concurrent
● and middleware: architecture design ideas redis, rocketmq, kafka, etc.
● Finally, ask how the usual technology upgrade
2. Technical three sides of the subject
1. Under high concurrency, how the system is to support the large number of requests?
2. Following the above problems, extended to the middleware, kafka, redis, rocketmq, mycat and other design ideas and proper
use scenes, etc.
3. ... recently been to the site on which technology; recently read which book.
4. The work and life meet the biggest challenge, how to overcome?
5. What future plans
Java middleware four
Finally, you know, go mainly HR processes, mainly to ask future career plans.
) Review six months of preparation, direct access to Alibaba
understand learning the knowledge
that time I have been looking for information to learn, but also to go to a friend through many channels - part of the US Mission Architect write Java interview Collection
(284) I put the US Mission architecture teacher gave me a book Kenwan Java interview, which also found a Java back end and - - scenes and interview some manufacturers continue to face questions brush problems to improve their vision)
) core Java book review interview knowledge of
this core Java the knowledge of each analytical point of deep knowledge, everyone should be very helpful, it put most of the Java knowledge
gathered in - depth analysis plays out (highly recommend everyone to see - - look)
1.JVM
2. JAVA set of
3 . JAVA multithreading
4. JAVA base
5. Spring principles
6. microcells
7. Hetty and the PC
8. the network
9. log
10.Zookeeper
11.Kafks
12.Rabbi TMQ
13.Hbase.
14.MongoDB
15.Cassandra
16. design pattern
17. The load balancing
18. database
19. consensus algorithm
20.JAVA algorithm
21. The data structure
22. encryption algorithm
23. The distributed caching
24.Hadoop
25.Spark
26.Storm
27.YARIN
28. A learning machine
29. A cloud computing 
requirements of manufacturers to interview scenarios (for people called skin can enhance learning, ah ha)
I was face to these manufacturers also find a lot of questions scene brush, to enhance their own is very large (also specifically asked for copies interview answers) 
US Mission partial surface through 
good future interview scene ** 
) The last
lot of people are saying that "science useless ", the reason actually produces useless, because they are learning and the match is not what you want
on, which means that their own is not enough to learn. Whether it is learning or work, you should have the initiative, so if you have a
giant dream, then they would have their own efforts to achieve it.
