Preface 2020 finally ushered in the last month, this year, the world is not stable, surrounded by the epidemic, gradually cured and immune, although there is no big difference between domestic and usual, but for the economic impact, I do not know how many years back? Large and small companies facing bankruptcy or bankruptcy, for us in the workplace, is undoubtedly a fatal blow, ok, back to the theme, as a JAVA blogger, look at the recent situation of JAVA ~
This year has seen a lot of people moving from Java to other industries, and a lot of people trying to get a piece of the market. Year after year, year after year. Of course, Java programmers are still in high demand, and there are many opportunities for advancement in Java jobs. But on the other hand, senior talent shortage, many even have work experience of programmers are not up to the requirements of large factory recruitment, compared to Ali, see you from senior talent still a few steps?
How do you learn? Two tips
First, assess your self-study ability.
Second, find effective study guides.
Today we provide some of this year’s dachang real questions, on the one hand, can help the friends who are preparing for the interview, on the other hand, because I prepared is the primary – intermediate – advanced three levels of dachang real questions, so you can try your own level, see yourself in which section?
Ali Cloud – Java Intern/Beginner List and Set difference
How is a HashSet guaranteed not to repeat itself
Is HashMap thread safe, and why not?
Expansion process of HashMap
What is the difference between HashMap 1.7 and 1.8?
Four kinds of references to objects
Java gets reflection in three ways
Java reflection mechanism
Arrays.sort and collections. sort
Cloneable interface implementation principle
Exception classification and handling mechanism
The difference between ‘wait’ and ‘sleep
How are arrays allocated in memory
Answer display:
Baidu – Java intermediate
What’s the difference between BeanFactory and ApplicationContext
The life cycle of Spring beans
How is Spring IOC implemented
Tell me something about the Spring AOP
Implementation principles of Spring AOP
Dynamic Proxy (Cglib and JDK)
Spring transaction implementation
Underlying principles of Spring transactions
How do I customize the annotation implementation
Spring MVC runs the process
Spring MVC startup process
Spring’s singleton implementation principles
What design patterns are used in the Spring framework
Why Netty
This section describes the Netty application scenario
The native NIO has an epoll bug in JDK 1.7
What is TCP sticky/unpack
TCP sticky/unpack solution
Netty threading model
Talk about Netty’s zero copy
Netty internal execution process
Answer display:
Ant Financial — Java Advanced
Topic 1:
1. What has changed between JDk1.7 and JDk1.8 Map (bottom level)?
2. ConcurrentHashMap
3. What is the difference between parallelism and concurrency?
4. What changes have taken place between jdk1.7 and jdk1.8 Java virtual machines?
5. If you were asked to design middleware yourself, how would you do it?
6. What is middleware?
7. Have you used ThreadLock before? What does it do?
8. What is the difference between Hashcode () and equals ()?
9. When is an index set in a mysql database but cannot be used?
Mysql optimization will not,mycat branch, vertical branch, horizontal branch?
11. Distributed transaction solution?
12 SQL statement optimization will not, say what you know?
Mysql storage engine
14. Red black Tree principle?
Topic 2:
1. What are the three distributed locks?
2. How does Redis work?
3. Redis data structure, usage scenarios?
4. What are the types of Redis clusters?
5. Codis principle?
6. Are you familiar with financial business? Bookkeeping? Ant Financial has requirements for this part.
Answer display:
Good ~ show finished, probably estimate oneself is bronze or king?
Some time ago, while chatting with group friends, I sorted out some different kinds of interview questions they saw this year, so I have the following set of questions, and also share with you ~
All the big factory interview questions, has been integrated for everyone (including the answer) need to get free troublePlease forward it and add assistant VX: Yunduoa2019 after following it or scan the qr code below and follow the guidance of the assistant to obtain it by yourself
Based on article
The JVM article
MySQL article
Redis article
The spring piece
Operating System
Multithreaded piece
Data structure
Network article
Because space is limited, so I have put together for you (including the answer) need to get free troublePlease forward it and add assistant VX: Yunduoa2019 after following it or scan the qr code below and follow the guidance of the assistant to obtain it by yourself
