60 open-ended test questions, recite them and get a pay rise directly

01 One topic

1、String str = new String(“abc”); Can build several objects ？String str1 = “abc”,str == str1?//false;

2、 What data structures have you used ？（ This is a routine ）

3、 Tell us your opinion ArrayList and LinkedList The difference between ;

4、 say something HashMap The underlying implementation of , Expansion mechanism , Thread safety problem ;（ When it comes to red and black trees , Why use red black tree instead of binary search tree ？）

5、 say something JVM Memory model , Followed by quotation , Then the garbage collection algorithm , To be specific, let's talk about the implementation of generational Algorithm ;

6、 State of thread ; call start（） What's going to happen , What methods will be executed ;

7、 Do you know thread pools ？ Why introduce thread pool , What are the parameters ？

8、synchronized Modify the difference between instance methods and static methods ;volatile Do you know the key words ？

9、Spring Used those notes ？ How to implement dependency injection ？AOP How to achieve ？（ agent ）;AOP What kind of agent is used in ？

10、 Algorithm problem

（1） Traverse once , Find the middle node of the single linked list （ Return one of the even lengths ）;

（2） For 100 million non repeating int Sort , But only memory 200M( Bucket sort );

(3） Use pattern, Yes "abbad",“ Beijing Hangzhou Hangzhou Beijing Shanghai ” check

(4) A small ball from 200 Landing at a height of meters , The examples mentioned every time are half of the last time , Excuse me at N After talking about this How much distance has passed ？

(5) Pure algorithm problem .25 horse ,5 Track (s) , No timer , How many times can I find the fastest one 5 horse ？

11、 Order order scenario test case design

02 Two topics

1、 Ask and introduce yourself , And the technology stack

2、redis What are the basic data structures

3、mq The role of

4、 How to solve burst operation , For example, different devices on the same account at the same time Click to receive a coupon

5、 How to automate daily execution . How long does it last? How to shorten the time

6、jmeter How to guarantee pressure measurement tps Always at a value

7、 How to solve the problem of too high pressure measurement memory

8、spring How to use database in ？2、spring IOC The understanding of the ？3、spring bean To understand and use ？4、 When the payment callback is delayed , What plans can be made to monitor ？ How to implement it from the code ？

9、 Introduction to index data structure , and B+ Tree difference

10、 Under what circumstances can you query without returning to the table

11、MySQL Transaction isolation level

12、 How to ensure the data consistency between the database and the cache

13、Redis Why single threaded

14、Redis Persistence strategy

15、Redis Cluster pattern

16、 What if the sentry hangs up （ So sentinels should also be clusters ）

17、Redis A cluster election master The process

18、MQ How to prevent message loss

19、 Introduce a process pool , How to get the number of threads in the thread pool , Which thread pools have been used

20、 What is the problem with using unbounded waiting queues

21、 Introduce the lock

22、 Introduce the lock upgrade process

23、 Introduce to you ReEntrantLock Underlying implementation , Introduce to you

24、 How to find the position of a string in a file

25、HashMap, Source level , Why thread is not safe

26、 Deadlock

27、Synchronized and ReentrantLock Locking mechanism , How to judge the re-entry lock , Can it be a deadlock ？

28、 Difference between process and thread ？

29、 How to ensure synchronization between processes ？

30、 Distributed lock

31、 object GC

31、 Garbage collection algorithm

32、JVM Parameters

33、OOM What are the scenes ？ Why does it happen ？

34、JVM Let's talk about the memory structure

35、 Heap and stack sharing ？

36、 There was a comparison Http and RPC Do you ？

37、HttpClient Please talk about the specific implementation ？（ What is involved ）

38、SpringMvc working principle ？

39、Session Cookie difference ？

40、 Shallow copy , Deep copy

41、wait and sleep The difference between

42、 Thread pool parameters , Description of the whole process

43、CAS and AQS What is it , principle

44、ThreadLocal principle , matters needing attention , Parameter passing

45、servlet Is it thread safe , How to transform

46、jvm Problem tools ,jps,jinfo,jmap

47、 I know jvm Tuning? ？ What commands have you used ? How do you usually tune ？

48、 How do you usually tune in a project JVM What about ？

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