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

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