Jinjiuyin-10 failed in interviews with major companies, and ended up joining the Alibaba java post. What have I experienced?

I started to prepare in February, more than a month, and think that I am also very serious about preparing. Helplessly, I met ByteDance in the early stage. Meituan and Tencent did not prepare enough when they first started the interview. Taking advantage of the beginning of ByteDance, they did not approve the interview in advance, and delivered to several departments. Get interview experience.

With the previous experience of meeting with three major factories, I finally got Ali's high-paying offer last week. (Interview questions are attached below)

one side:

1. Introduce yourself
2. The most impressive project done in school, the entire model design of the project?
3. java memory model
4. Garbage collection mechanism
5. The underlying data structure of hashmap, what about after java1.8?
6. Is hashmap thread safe?
7. How does concurrenthashmap achieve thread safety?
8. final keyword
9. The difference between stringbuilder and stringbuffer?
10. What situation is easy to cause by stringbuilder in multithreading situation?
11. The framework used in the project?
12. How does spring IOC aop work?
13. Which sorting algorithm are you most familiar with?
14. Linked list reversed?

Two sides

1. 1T large file, 4G memory, design a specific algorithm to count the first 1000 numbers, how to determine the number of files, how to operate it, how complicated is it, and how to do each step is very detailed.
2. How to design a spike system, or continue to explore and deepen
3. mysql search engine
4. The process of url, specifically how to operate in spring

Three sides

1. Talk about a few of your favorite data structures and talk about where you usually use them
2. Horizontal talk about Java memory model
3. Talk about dynamic programming as an example
4. Do you know how to design large distributed systems?
5. These technologies say you are familiar with
6. Talk in detail about the mathematical modeling competition
7. Talk about your future plans

Let me share with you the analysis of 498 questions in this Java senior engineer interview that I spent a month in order to enter the big factory. This is a compilation of the core interview questions for Java senior engineers from 15 Internet companies!  I hope everyone can get an offer

Note: If you need this "core interview with Java senior engineers from 15 Internet companies" (and more learning materials), you can share it with everyone for free . The WeChat of the assistant in the picture below: (vip23373) Add it and you can get it for free. As a developer, these core knowledge is really not to be missed, so that you can improve your technology in the interview.

Java concurrency

• What is the difference between daemon thread and local thread in java?
• The difference between thread and process?
• What is context switching in multithreading?
• The difference between deadlock and livelock, the difference between deadlock and starvation?
• An ArrayList is deleted during the loop, will there be a problem, why?
• The @transactional annotation is invalid under what circumstances and why.
• What are the basic interfaces of the Java collection framework?
• What is the difference between HashSet and TreeSet?
• What is the underlying implementation of HashSet?
• How does LinkedHashMap work?
• Why does the collection class not implement the Cloneable and Serializable interfaces?
• What is the difference between Array and ArrayList? When should I use Array instead of ArrayList?
• What are the best practices for the Java collection framework?

Java concurrent analysis

 

MyBatis frequent interview questions

• What is the difference between MyBatis and Hibernate?
• What is the difference between #{} and ${}?
• What should I do when the attribute name in the entity class is different from the field name in the table?
• How to write like statement in fuzzy query?
• How does Mybatis pagination? What is the principle of the paging plugin?
• How does Mybatis encapsulate the sql execution result as a target object and return it?
• What are the mapping forms?
• How to pass multiple parameters in mapper?
• What is the use of Mybatis dynamic sql? How does it work? What are the dynamic SQL?

MyBatis problem analysis

 

Microservice interview questions

• What do you know about microservices?
• What are the advantages of microservice architecture?
• What are the characteristics of microservices?
• What are the best practices for designing microservices?
• What are the advantages and disadvantages of the microservice architecture?
• Monolithic, what is the difference between SOA and microservice architecture?
• What challenges do you face when using microservice architecture?
• What are the main differences between SOA and microservice architecture?

Microservice interview questions analysis

 

Spring Boot, Spring Cloud interview questions

• Why use Spring Boot?
• What are the core configuration files of Spring Boot? What is the difference between them?
• What are the formats of Spring Boot configuration files? What is the difference between them?
• What is the core annotation of Spring Boot? Which annotations are mainly composed of?
• What are the ways to enable Spring Boot features?
• Does Spring Boot need a separate container to run?
• What are the ways to run Spring Boot?
• How do you understand Starters in Spring Boot?
• How to run some specific code when Spring Boot starts?
• What are the ways to read configuration in Spring Boot?
• How many ways does Spring Boot implement hot deployment?
• How to configure Spring Boot multiple sets of different environments?
• Is Spring Boot compatible with old Spring projects and how to do it?
• What is Spring Cloud?
• Introduce the commonly used components of Spring Cloud?
• How does Spring Cloud implement service registration?
• What is load balancing? what's the effect?
• What is a service circuit breaker?
• Please introduce the main function of Ribbon?

Spring Boot, Spring Cloud interview questions analysis

 

Redis interview questions

• What are the advantages of Redis over Memcached?
• What are the differences between Memcache and Redis?
• What are the benefits of using Redis?
• What is the maximum capacity that a string value can store?
• What is the persistence mechanism of Redis? Their advantages and disadvantages?
• Redis recycling strategy (elimination strategy)?
• There are 2000w data in MySQL, and only 20w data in redis, such as
• How to ensure that the data in redis is hot data?
• What are the advantages and disadvantages of Jedis and Redisson?

Redis interview questions analysis

 

Dubbo interview questions

• Is the service call blocking?
• What are the layers of Dubbo's overall architecture design?
• Can a service be directly connected to the same service when there are multiple registrations?
• How many solutions does Dubbo cluster fault tolerance have?
• How is the Dubbo configuration file loaded into Spring?
• What is the difference between Dubbo SPI and Java SPI?

Dubbo interview questions analysis

 

JVM and tuning

• The memory structure of the JVM.
• The working process of JVM method stack, what is the difference between method stack and local method stack.
• How do references in the JVM stack relate to objects in the heap.
• You can learn about escape analysis techniques.
• Common algorithms of GC
• The garbage collection process of CMS and G1, which two of the various stages of CMS are Stop the world, and whether CMS will generate fragments, is the advantage of G1.
• The process and advantages of the parent delegation model.
• Commonly used JVM tuning parameters.
• When did the subject enter the old age?
• What is memory overflow, memory leak? What is the difference between them?
• What are the behaviors that cause class loading operations?
• Introduce the common tools provided by JVM
• What is the difference between Full GC, Major GC, and Minor GC?
• When is Full GC triggered?
• Under what circumstances will stack overflow
• Talk about strong references, soft references, weak references, phantom references and their relationship with gc

JVM interview questions analysis

 

Finally, I would like to emphasize again. If you want to change job interviews without panic, then read through this " Analysis of 498 Questions of Core Interview for Java Senior Engineers of Internet Companies ", and you can share it with you for free if you need it. After one-click triple connection, look at the WeChat of the assistant: (vip23373) Add it and get it for free. As a developer, these core knowledge are really not to be missed, so that you can improve your technology in the interview.