Yesterday, during a short break, a high school classmate contacted me and said that he wanted to invite me to dinner. Of course, I did not hesitate to agree to such a good thing!
Wait...could you ask me to borrow money?
So panic, what should I do? It has been promised.
In the following conversation, he told me that he had gotten offers from five major Java companies, including Ali, JD.com, and Ping An, but they were two juniors and three intermediates.
I asked him, it’s been two years since we graduated, plus one year of internship, and it counts as three years of work experience.
He said, firstly, he was delayed for one and a half years because of family affairs. Secondly, he had no competitive advantage in his academic qualifications, he didn't know whether he could enter Ali, and he didn't know the depth of his skills. He also said that if I hadn't shared a set of systematic interview questions and a document about interview strategy in the group years ago, he would have changed his career.
Looking back, I seem to have shared two documents with my friends a year ago. I shared them only because I thought they were good and useful.
Nowadays, my classmates can obtain java job offers from 5 major factories at the same time through these materials. I am very pleased.
Here comes the point...
He told me that during this period of time, he traveled around the country, coupled with telephone interviews, and interviewed nearly 10 Internet companies. He had a lot of experience. He also accumulated several sets of real interview questions, and asked me if I want to.
he! actually! ask me! Do you want? !
Brother, if you don't send it within two minutes, see you in the drift bottle in the future!
Hot big factory real question, would you like it?
The real interview questions are all hot, not only the questions, but also the complete answer analysis, which has been sorted out. Friends of programmers who need it can forward this article
Hangzhou-Alibaba Cloud, Java Elementary
- The difference between List and Set
- How does HashSet guarantee non-repetition
- Is HashMap thread-safe? Why is it not thread-safe (it is better to draw a picture to show that it is not safe in a multi-threaded environment)?
- HashMap expansion process
- The difference between HashMap 1.7 and 1.8, explain what optimizations have been made in 1.8, and how?
- ↑(It is very common in the interview process of large factories to focus on a technical point layer by layer)
- Four references to objects
- Three ways to get reflection in Java
- Java reflection mechanism
- Arrays.sort and Collections.sort implementation principles and differences
- Application of LinkedHashMap
- Cloneable interface implementation principle
- Exception classification and handling mechanism
- The difference between wait and sleep
- How the array is allocated in memory
Examples of answers:
Beijing-Jingdong, Java Elementary
- Under what circumstances will objects be disposed of by the garbage collection mechanism?
- What objects can be regarded as GC Roots?
- If the object is unreachable, will it be collected by the garbage collector?
- Tell me about common encoding methods?
- How many bytes does Chinese in utf-8 encoding occupy; how many bytes does int type?
- What is the difference between static proxy and dynamic proxy, in what scenarios?
- Java's exception system
- Talk about your understanding of analysis and assignment
- Modify the signature of the equals method of object A, then when the HashMap is used to store this object instance, which equals method will be called?
- What is the mechanism to achieve polymorphism in Java?
- How to serialize a Java object into a file?
- Talk about your understanding of Java reflection
- Talk about your understanding of Java annotations
- Talk about the principle of generics and give examples
- Understanding of String in Java
- Why should String be designed to be immutable?
Examples of answers:
Beijing-Baidu, java intermediate
- What is the difference between BeanFactory and ApplicationContext
- The life cycle of Spring Bean
- How to implement Spring IOC
- Talk about Spring AOP
- Spring AOP implementation principle
- Dynamic proxy (cglib and JDK)
- Spring transaction implementation
- The underlying principle of Spring transaction
- How to customize annotations to implement functions
- Spring MVC running process
- Spring MVC startup process
- Spring's singleton implementation principle
- What design patterns are used in the Spring framework
- Why choose Netty
- Talk about the usage scenarios of Netty in business
- Native NIO has an epoll bug in JDK 1.7
- TCP sticky/unpacking solution
- Netty thread model
- Talk about Netty's zero copy
- Netty internal execution process
Examples of answers:
Shenzhen-Ping An, java intermediate
- Introduce the main items on the resume, draw a frame diagram, and explain the process
- Ask questions about skills on your resume
- Various application scenarios of redis
- Redis persistence mechanism
- mysql tuning
- Do you know the difference between Docker, Docker and virtual machine?
- Talk about the structure of rabbitmq
- The relationship between rabbitmq queue and consumers?
- Rabbitmq switch types
- Where are kafka and kafka features used in the project?
- Rabbitmq, RocketMq, kafka comparison
- Introduce springcloud core components and their functions, and springcloud workflow
- Introduce the springcloud heartbeat mechanism, and how does the consumer discover the server (Ribbon)?
- Disadvantages of eureka
- Eureka caching mechanism?
- What is the difference between rpc and http, and the usage scenarios?
- How to maintain consistency in distributed transactions?
- Under what circumstances is distributed development used?
- Jvm memory model, the characteristics of each part?
- Class loader, parent delegation model?
- Class loading mechanism
- The structure of the java heap, after a bean is new, the direction of the memory space?
- How to make the stack overflow, how to make the method area overflow?
- Write a few jvm optimization configuration parameters
- What are the GC mechanisms?
- spring related...
- Data structure related...
- Concurrency related...
- Thread pool related...
- Database related...
- (He had an interview with Ping An, I was a little surprised, I feel Ping An is not looking for an intermediate programmer, this is an architect)
Examples of answers:
Shenzhen-Yinsheng Payment, java intermediate
- Talk about the working principle of springcloud
- What component is used to make the request?
- How many seconds is the registration center heartbeat?
- How do consumers discover service providers?
- If multiple consumers call the same interface, what is eruka's default allocation method?
- Talk about common springboot annotations and their implementation?
- What is spring transaction annotation? Under what circumstances will things roll back?
- Talk about the spread and isolation level of spring things?
- What is the mysql engine? Their difference?
- How does innodb implement mysql transactions?
- Talk about mysql index?
- Talk about the principle of b+ tree?
- Let you design an index, how would you design it?
- Also asked the difference between git and svn?
- Some underlying principles and processes of git commands?
Examples of answers:
