Recently, a younger brother told me that interviews are too difficult now, and it’s no longer the time to memorize a few interview questions and get an offer. Recently, my friend interviewed Ali for a job change, and then I exchanged some of the interview questions he encountered, and then I sorted it out, and then shared it with friends in need and also checked for missing vacancies. However, there is no answer to these questions. The answer can be Baidu or go directly to the end of the article to download the answer I compiled. There is no routine to download directly. Welcome to whoring!
one side
- 1. Start by introducing yourself;
- 2. The realization principle of HashMap, what is hash collision, and how to solve hash collision?
- 3. The principle of ConcurrentHashMap and the difference from HashTable?
- 4. The difference between HashSet and TreeSet and the underlying implementation principle
- 5. The key-value is stored in the HashMap, and the value is repeated but all of the Comparable type can be compared; how to sort this collection according to the value, and introduce the implementation method
- 6. What is the difference between ReentrantLock and synchronized keywords?
- 7. Synchronized modifies the static method, what is the specific lock?
- 8. Troubleshooting methods for cpu and memory abnormalities at work; explain the analysis process and positioning solutions in detail
- 9. Next is the project. The problems in the project are relatively simple; Then there are various basics, jvm memory model, nio, bio, aio, high concurrency, sychronized and volltail, HashMap, data structure and expansion; There are also some scene topics, How to design the system in the case of large concurrency/mass quantity. Take two points from it to ask, one is system decoupling, the other is sub-database sub-table; the last one is coding problem, the key in HashMap is a custom object, there are more questions about sorting jvm, how about online release Realize distribution, redis commands, data structure, internal database lock mechanism, online problem solving, sql optimization, etc.;
Two sides
- 1. The principle of ClassLoader, cite application scenarios and working examples, introduce the class loading process and application in work
- 2. The realization principle of HashMap, what is hash collision, and how to solve hash collision?
- 3. The principle of ConcurrentHashMap and the difference from HashTable?
- 4. The difference between HashSet and TreeSet and the underlying implementation principle
- 5. The key-value is stored in the HashMap, and the value is repeated but all of the Comparable type can be compared; how to sort this collection according to the value, and introduce the implementation method
- 6. What is the difference between ReentrantLock and synchronized keywords?
- 7. Synchronized modifies the static method, what is the specific lock?
- 8. Troubleshooting methods for cpu and memory abnormalities at work; explain the analysis process and positioning solutions in detail
- 9. The principle and optimization of a jvm;
- 10. sql optimization;
- 11. The framework principle used now, such as using dubbo, will ask about the principle of dubbo, and how h5 calls dubbo, etc.;
- 12. Next is the project, the problem in the project is relatively simple;
- 13. Then there are various foundations, jvm memory model, nio, bio, aio, high concurrency sychronized and volltail, HashMap, data structure and expansion;
- 14. There are also some scene problems, how to design the system in the case of large concurrency/mass quantity. Take two points from it to ask, one is system decoupling, the other is sub-database sub-table; 15. The last one is coding problem, the key is a custom object in HashMap, sort
Three sides
- 1. The method implemented by the executor service and the parameters that can be set;
- 2. An algorithm is proposed to find the nth node from the bottom in the linked list;
- 3. I also asked the difference between thread and runable;
- 4. What is a clustered index;
- 5. Redis asked a solution to a practical problem. If a value of redis is particularly large, what solution is there;
- 6. Redis memory elimination mechanism;
- 7. The default isolation level of mysql;
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- Heap sort
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- paxos protocol
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- Cross-computer room deployment, problems encountered and solutions, the annual rate of 9999 is 11. MMM's DB architecture, the master is never fully synchronized, the master is hung up, what will be the impact of unsynchronized content, how to restore
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- What is the difference between ng and tomcat? Can the two roles be interchanged? That is: tomcat as a reverse proxy, ng as a service container. Explain the reason.
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- DNS protocol
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- volatile realization principle
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- NAT: public network ip and LAN ip conversion
- 16. Class loading delegation mechanism, lock application, project architecture
Four sides:
- jit, nio, sorting algorithm, hashmap, more project details~
- 1. Talk about what you are mainly responsible for in the project, what is the structure of the project you are responsible for, what you are responsible for, etc.;
- 2. JVM class loading mechanism;
- 3. JVM memory model, what is the stack space, and under what circumstances the stack memory will overflow;
- 4. JVM tuning;
- 5. JVM garbage collection mechanism;
- 6. I am more concerned about whether you understand financial knowledge and whether you have experience in financial project development;
- 7. Jvm fence problem, the use of threadlocal;
- 8、JVM
- 9. Multithreading
- 10. List intersection
- 11. Solve the problem of high CPU usage when the project is running
- 12. Several mechanisms for thread synchronization
- 13. Linux retrieves the log and matches the top10 with the most requests
Due to the limited space, only these are listed, and more
students who need it in the network disk can download them directly from the lanzou network disk below.
I hope everyone likes and supports it~~
Download link : https://wws.lanzous.com/iDLFIjptp2f Below the
link
is a screenshot of part of the question set: