2021 explanation of the latest Java high-frequency selected interview questions, which is a must for java development

Cxy kill does not match 2021-10-14 09:05:31
explanation latest java high-frequency high


One side of the ant gold suit :

Phone call from Hangzhou in the afternoon , Ask if you are free , I'm free , Although I feel a little nervous , A little confused .

The question of the interview :

  1. HashMap and Hashtable The difference between
  2. Implement an algorithm to ensure the iteration order HashMap
  3. Let's talk about sorting algorithms , stability , Complexity
  4. say GC
  5. Guaranteed internship duration
  6. Occupation planning

As a whole , There are many basic problems on one side , So the bloggers basically answered , There are still some uses for it . So it's not bad after one side , And then the next afternoon we met again .

2021 newest Java Explanation of high frequency selected interview questions ,Java Development must see _ The backend development

Two sides of ant gold suit

On the other hand, I was the most flustered interview , Because two sides are the most important , It's the biggest executive interview , So it's very critical , As a whole , The rhythm on both sides is very fast , It's totally different from one side , The interviewer would like me to finish the answer in a concise way , So the surface is not very good , At the end of that time, I thought GG 了 , Fortunately, I was lucky in the end , The interview questions are as follows :

  1. Self introduction. .
  2. JVM How to load a class , What are the methods in the parental delegation model ?
  3. HashMap How to achieve it ?
  4. HashMap and Concurrent HashMap difference , Concurrent HashMap Is thread safe , Concurrent HashMap How to ensure Thread safety ?
  5. HashMap and HashTable difference ,HashTable Is thread safe ?
  6. There are several ways of interprocess communication ?
  7. JVM Which areas are divided into , What do you do in every district ?
  8. JVM how GC, The new generation , Old age , Lasting generation , What's in store ?
  9. GC In the algorithm of citation reachability analysis , Which objects can be used as GC Roots object ?
  10. Quick sort , The process , Complexity ?
  11. What is a binary balanced tree , How to insert nodes , Delete node , Say the key steps .
  12. TCP How to ensure reliable transmission ? Three handshake process ?
  13. TCP and UDP difference ?
  14. Sliding window algorithm ?
  15. Linux How to schedule processes under ?
  16. Linux What are your common commands ?
  17. When will the operating system deadlock ?
  18. frequently-used hash What are the algorithms ?
  19. What is a consistent hash ?
  20. How to understand distributed locks ?
  21. What are the paradigms in the database ?
  22. The structure of the index in the database ? When it's appropriate to index ?
  23. Java Medium NIO,BIO,AIO What are the differences ?
  24. What tools are used to debug programs ?JConsole, Have you used it ?
  25. Now? JVM A thread in is suspended , How to find out the reason with tools ?
  26. The relationship between thread synchronization and blocking ? Must synchronization be blocked ? Does blocking have to be synchronized ?
  27. What is the difference between synchronous and asynchronous ?
  28. Thread pool used ?
  29. How to create a singleton pattern ? Said double check , He said it was not thread safe . How to efficiently create a thread safe singleton ?
  30. concurrent Under the bag , What have you used ?
  31. What are the common databases ?redis Have you used it ?
  32. understand hadoop Do you ? say something hadoop What are the components of ?hdfs,hive,hbase,zookeeper. Under the said mapreduce Programming model .
  33. What open source protocols do you know ?
  34. What open source software do you know ?
  35. What books have you been reading recently ?
  36. Do you have any questions for me ?
  37. Know what design patterns ? Tell me which design patterns have been used
  38. How to judge whether a single linked list has rings ?
  39. How the operating system performs paging scheduling ?
  40. What is an anonymous inner class ? How to access variables defined outside of them ?

The interviewer on both sides asked me urgently , I'm quick to answer , So there are two questions that are not well answered , But the interviewer made me feel a sense of awe , Because he speaks faster , But they can all come to the point , The most important thing to say is very acceptable .

Two sides passed , I got three calls that night ( Ali's efficiency really amazes me )

2021 newest Java Explanation of high frequency selected interview questions ,Java Development must see _ The backend development _02

Three sides of ant gold suit

The three sides are already cross interviews , Basically around my project , After my previous interviews , At this time, I have a high interview experience value , So I didn't panic at all when I was on three sides , The answer is very steady , Three questions are as follows :

  1. Self introduction. , What projects have you done .
  2. java How to divide the area of the virtual machine , The kinetic energy of each zone , This piece is free to play .
  3. In the parental delegation model , From top to bottom , Which class loaders are , Which classes are loaded respectively ?
  4. Is it possible that parent class loaders and child class loaders , Load the same class ? If you load the same class , Which class to use ?
  5. HashMap Structure ,get(),put() How is it realized ?HashMap What are the problems ?
  6. ConcurrentHashMap Of get(),put(), How to achieve it ?ConcurrentHashMap What are the problems ? ConcurrentHashMap Is your lock a read lock or a write lock ?
  7. HashMap And HashTable The difference between
  8. sleep() and wait() The methods of which class , What's the difference? ?synchronized How does the underlying layer achieve ? What's the difference between code blocks and methods ?
  9. What is a thread pool ? If you design a thread pool of dynamic size , How to design , There should be some ways ?
  10. What is a deadlock ?JVM thread deadlock , How do you judge what it is because ? If you use VisualVM,dump Thread information comes out , What information will there be ? This one asks a lot … I was confused when I asked . Because I haven't actually operated = =
  11. see jvm There are piles in the virtual machine 、 Thread information , What commands have you used ? I've only used the graphical interface VisualVM...
  12. What are the garbage collection algorithms ?CMS Do you know? ? How it works ?
  13. What is a transaction in a database ? The isolation level of the transaction ? Four characteristics of transactions ? What is dirty reading , Fantasy reading , It can't be read repeatedly ?
  14. What are the structures of database indexes ? I said, B Trees and B+ Trees , He said there were only these two . I said full text inverted index . Then introduce B+ Tree structure .
  15. How to write paging query statement in database ?
  16. What is a consistent hash ? What problem to solve ?
  17. Redis Storage structure of , Or how it works , And mysql The difference between ? What are the data types ?
  18. Used in the project redis, Why choose redis, Know more about NoSQL Database ? How to use... In your project redis Of ?key What is it? ,value What is it? ?
  19. The process of merging and sorting ? Time complexity ? Spatial complexity ?
  20. What sort do you usually use ? Quick sort . Talk about the situations that apply , Which scenarios are not applicable .
  21. What do you do in the project ? Because I use Solr, He asked me Solr How it works ?

The final summary

Get rid of the algorithm , I'm not afraid anymore , There are these that need to be shared in the article Binary tree 、 Linked list 、 character string 、 Stack and queue, etc

Finally, share one more The ultimate gift bag of hand tearing Architecture ( Learning notes ): Distributed + Microservices + Open source framework + performance optimization

2021 newest Java Explanation of high frequency selected interview questions ,Java Development must see _ The backend development _03

This article has been  CODING Open source project :【 A big factory Java Analysis of interview questions + Core summary learning notes + The latest explanation video + Actual project source code 】 Included

版权声明
本文为[Cxy kill does not match]所创,转载请带上原文链接,感谢
https://javamana.com/2021/10/20211002160900563k.html

  1. Usage relations and differences of count (1), count (*) and count (a field) in MySQL
  2. 2021 Ali Java advanced interview questions sharing, Java Architect interview materials
  3. Mybatis - dynamic SQL statement - if usage - MySQL series learning notes
  4. [go to Dachang series] deeply understand the use of where 1 = 1 in MySQL
  5. [secret room escape game theme ranking list] Based on spring MVC + Spring + mybatis
  6. Redis log: the killer mace of fearless downtime and rapid recovery
  7. 5 minutes to build redis cluster mode and sentinel mode with docker
  8. Java小白入门200例106之遍历ArrayList的几种方式
  9. Java小白入门200例105之Java ArrayList类
  10. Java小白入门200例104之JDK自带记录日志类logging
  11. Practice of high availability architecture of Tongcheng travel network based on rocketmq
  12. Chapter 9 - Linux learning will - file archiving and compression tar --- zip
  13. Java小白入門200例104之JDK自帶記錄日志類logging
  14. JDK avec journalisation de classe dans 200 cas 104
  15. Java ArrayList Class for Introduction to Java LITTLE WHITE 200 example 105
  16. Plusieurs façons de traverser ArrayList à partir de 200 exemples 106
  17. Provectus / Kafka UI: open source Apache Kafka's Web GUI Graphical interface management tool
  18. Design pattern series: Singleton pattern
  19. Java小白入門200例105之Java ArrayList類
  20. Understanding Java record types
  21. Five load balancing algorithms implemented in Java
  22. Data structure must be an example to understand dynamic programming (with universal Python code)
  23. The idea and implementation of recursion in data structure (Python)
  24. The idea and implementation of linked list (Python)
  25. Data structure must be queue and double ended queue (Python)
  26. Idea and implementation of data structure must be able stack (Python)
  27. Data structure | time complexity (with video explanation)
  28. 20 flutter libraries you should know
  29. Case sharing: Online failure caused by Dubbo 2.7.12 bug
  30. Open source | didi open source, general functional components for Java authentication, authentication, management and task scheduling
  31. Flutter multi engine supports platformview and thread merging solution
  32. In depth understanding of netty: viewing netty traffic control from occasional downtime
  33. Spring AOP internal skill cultivation
  34. Interviewer: is Tomcat a symbolic parent delegation mechanism?
  35. Expérimentez la première tablette de consommation Linux. La puce et le système d'origine sont tous faits maison
  36. 2021 summary of the latest Java common open source libraries, Java interview handwritten code
  37. 2021 latest Java factory interview true questions, Kafka introduction video
  38. 01 javase - première connaissance de l'installation de Java et de l'environnement de développement
  39. The sales volume in September broke the record: Weilai and Xiaopeng both exceeded 10000, with an ideal month on month decrease of 24.7%
  40. Required for interview: HBase block cache
  41. Redis core principle and practice: implementation principle of hash type and dictionary structure
  42. MySQL deep dive: analyzing performance schema memory management
  43. Redis cache: kill interviewer 25 asked
  44. Solution of Chinese garbled code in idea integrated Tomcat console
  45. 2021 the latest java development interview, 46 interview questions take you to understand the advanced Java interview
  46. 2021 spring recruitment bat interview questions are explained in detail and explained clearly
  47. 2021 latest java developer learning route, 2021 latest Ali Java advanced interview questions and answers
  48. 2021 summary of the latest Java common open source libraries, the top java development tools necessary for developers
  49. Java communique avec les capteurs industriels via socket et DTu, RTU
  50. Does Hadoop have to run on Linux? (the root cause is the permission opening advantage of the operating system Linux)
  51. Java communique avec les capteurs industriels via socket et DTu, RTU
  52. 2021 summary of the latest java knowledge system. It took 8 days to finally understand JVM tuning
  53. Introduction au tissu de service Azure
  54. 【.Net vs Java? 】 先来看一下Java和C#的数据类型区别。
  55. 2021 summary of the latest java knowledge system, will you only have the technology of junior engineers
  56. 【.Net vs Java? 】 先來看一下Java和C#的數據類型區別。
  57. [.NET vs Java?] regardez d'abord les différences de type de données entre Java et C #.
  58. 2021 latest Java interview questions and answers, Java interviewer's favorite garbage collection mechanism
  59. 2021 latest Java interview written test, distributed ID generation algorithm in Seata project of source code analysis
  60. 2021 latest Java experience sharing, what java knowledge do we need to learn