preface
Recently saw a very realistic story: land recently mentality very collapse. The Chen Qi that enters a company together with him in the same period rose one level again, but obviously everybody is in when entering a company, Chen Qi no matter be record of formal schooling or work experience, everything is inferior to oneself, at present however short two years time jumps above oneself rank, this lets him have a few minutes really not reconciled. Land do not understand, clearly their very hard, the company requirements 996, he very anxious 007, almost as a company home. Chen Qi, on the other hand, almost got off work. Not only that, but also very “irreverent” after work to participate in a variety of interest classes. It is called cultivating interest and improving ability, but in the view of the road, it is a fool. But Of Chen Qi “do STH over and over again”, brought substantial promotion to him however, and stick to the land route that did sufficient surface kung fu on company post, besides a small promotion half a year ago, after then have no action again. Scan widely workplace, encounter land such “bottleneck” actually not a few. But the reason behind it, “underachievement” is one kind, but more, it is inefficient efforts to bring self-paralysis and deception, in fact, standing still, and in the fierce competition in the workplace, but has always been not to advance or retreat, survival of the fittest.
Through this story tells us a truth: people only continue to learn will continue to progress, a turnip a pit, step by step, pay will have a harvest otherwise do not pay must not harvest! Never too old to learn, learning is accumulated over a long period of time, bit by bit accumulated, maybe the following interview questions can help you, at least not feel blind or even confused to learn!! The only way to occupy the commanding heights of life is to learn and constantly improve yourself. Come on! The youth 、、、、、、
JAVA core knowledge
JVM, JAVA Collections, Networking, JAVA Multi-threaded Concurrency, JAVA Fundamentals, Spring Principles, Microservices, Zookeeper, Kafka, RabbitMQ, Hbase, MongoDB, Cassandra, Design Patterns, Load balancing, Databases, Consistent Hashing, JAVA Algorithms, Data structures, encryption algorithms, distributed caching. Full Version of the Java InterviewJAVA backend test integration
Java related
Interview questions
(1) JVM memory model?
(2) GC garbage collection algorithm?
(3) Explain the new generation and the old age?
(4) What are the basic types of Java? Is String a Java base type? Why is String final?
(5) What about the JVM’s threading model? What are these areas for? Java thread model vs. JVM thread model
My JAVA learning notes
(1) JAVA interview treasure book
(2) Redis learns thinking brain map
Interview questions
(1) Does EDIS understand? How to use Redis to implement distributed lock?
(2) Redis common data structure and the implementation of the underlying data structure?
(3) How to solve the concurrent Key competition problem of Redis?
(4) How to ensure the data consistency between cache and database double-write?
My Redis study notes
(1) 14 high frequency Redis knowledge points
(2) Why redis/why cache (high performance, high concurrency)
(3) Why use Redis instead of Map/Guava for cache?
(4) Redis vs. memcached
(5) Analysis of common redis data structures and usage scenarios (String, Hash, List, Set, Sorted Set)
(6) Redis sets the expiration time
(7) Redis memory flushing mechanism (MySQL has 2000W data, redis only 20W data, how to ensure that redis data are hot data?)
(8) Redis persistence mechanism (how to ensure that redis hangs and then restarts data can be recovered)
(9) Redis transaction
(10) Common Redis exceptions and solutions (cache penetration, cache avalanche, cache warming, cache degradation)
(11) Common application scenarios in distributed environment (distributed lock, distributed auto-increment ID)
(12) Redis Cluster mode (master-slave mode, Sentinel mode, Cluster Cluster mode)
(13) How to solve the problem of concurrent competing keys in Redis
(14) How to ensure data consistency between cache and database double-write?
(3) MySQL learning mind brain map
MySQL related interview questions
(1) What locks does MySQL have?
(2) What is ACID
(3) Innodb index implementation
(4) B+ tree
(5) The principle of AUTO_INCREMENT
(6) What kinds of database indexes? Why index B+ trees? What is the difference between a composite index and several individual indexes? Large table query optimization for database? Do you understand the MVCC mechanism? What’s wrong with MVCC? How to solve this problem? Mysql slow statement tuning done? Tell me how you did it.
My MySQL study notes
(1) MySQL interview
Atomicity, consistency, isolation, durability?
(3) Transaction concurrency? Transaction isolation levels, what problems are caused by each level, which level is MySQL’s default?
(4) MySQL common storage engine (InnoDB, MyISAM, MEMORY) difference?
(5) What are the applicable scenarios of the two storage engines of MySQL MyISAM and InnoDB at transaction and lock levels?
(6) Order of execution of different elements (where, jion, limit, group by, having, etc.)
(7) What is a temporary table? When does a temporary table drop?
MySQL > select * from B+Tree;
(9) SQL query statement to determine which type of index to create? How to optimize queries?
(10) What is the difference between clustered index and non-clustered index?
(11) what locks (optimistic lock pessimistic lock), select how to add an exclusive lock?
(12) Non-relational database and relational database differences, advantages comparison?
(13) Database three paradigms, according to a scenario design data table?
(14) Read/write separation of database, master-slave replication, master-slave replication analysis of 7 problems?
(15) Optimize SQL and indexes using Explain?
(16) MySQL slow query how to solve?
(17) What are inner join, outer join, cross join, Cartesian product, etc.?
(18) Mysql has what locks, deadlock determination principle and specific scenarios, deadlock how to solve?
(19) How to use varchar and char
(20) mysql high concurrency environment solution?
(21) Transaction recovery mechanism in case of database crash (REDO log and UNDO log)?
(4) Multithreaded concurrent programming learning thinking brain map
(5) Thinking/algorithm
Interview questions
(1) Use O(N) complexity to complete GBDT splitting
(2) Find the longest distance between the inversions in the unordered array
(3) A RAND5 () is given to realize a uniformly distributed RAND7 () generator
(4) there is a point, 5 km north, 10km east, 5 km south, back to the origin. There are a couple of points like that. Prove that.
(5) There is an object of n grams, a balance, and several weights. The balance has no scale. How many kinds of weights can be used at least to weigh the mass of this object? The mass and number of weights are specified by themselves.
Algorithm to brush the topic
(1) Programming skills
(2) Linear table
(3) String
(4) Stack and queue
(5) the tree
(6) Sort
(7) Search
(8) Enumeration of violence
(9) Breadth-first search
(10) Depth-first search
(11) Divide-and-conquer
(12) Greedy method
13. Dynamic programming
(14)
(15)
(6) Network related
Interview questions
(1) What is the OSI seven-layer model?
(2) For example, which layer is the network protocol?
(3) TCP UDP difference?
(4) how does TCP achieve reliable connection?
2* MSL in Time_Wait
(6) What happens if TCP suddenly fails the receiver?
(7) HTTP status code meaning, 503 504,200?
(8) GET and POST?
(9) What process does a URL go through from input to access?
conclusion
The interview is easy, but if you want to be interviewed by your favorite company, you must work hard to learn. You must consider all kinds of questions asked by the interviewer and do not take chances in the interview, because you have all kinds of interview experience before and still retain all kinds of interview questions. I would like to share it with you for free. Meanwhile, I also have some interview teaching videos for free. Please come to me and get them!! Full Version of the Java InterviewJAVA backend test integration 
