The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
One of my best friends has interviewed Meituan four times from last year to this year, including food delivery, order and business travel departments. Finally, he successfully won the offer at the beginning of this year. It is concluded that the general idea of interview of each department is basically the same. Such as:
- JVM parameter configuration, common debugging tools, partitioning, class loading, and other questions you need to debug online? How to solve the problem of CPU surge in an infinite loop?
- Java and package common tool usage and principle, will cooperate with the collection class together with the test, yes also will have volatile, CAS principle, etc.
- MySQL is also a must, index storage structure, index search principle, transaction isolation level and principle, these are really every question. Of course, in addition to MySQL, Redis and ES also interview long articles, mostly focused on principles. For example, ES inverted index, sharding principle, Redis zset principle and use scenarios, multiplexing, penetration, fuse and so on.
- Framework is also a necessary knowledge point, the most common is AOP principle, how to achieve their own? How does Spring Boot work? Frameworks are often tested in conjunction with design patterns, such as what design patterns are most familiar to you? What design patterns are used in Spring MVC? What problem was solved?
- The next most important thing is service governance, which has too much content. Dubbo or Spring Cloud, in short, this place is the best place to show your real work experience and the depth of problem consideration. After all, it is really difficult to deal with this place without really practicing in a huge system.
- There is also one of the most important algorithms, which depends on more practice at ordinary times, LeetCode Chinese version online, one question a day, the interview will be invincible.
There is only one key point, that is, whether he has a question bank in big factory or not, the general direction of the interview questions is so many, if you have mastered all, still worried about going to big factory?
So the point is, how to review?
In fact, step by step, not only by brushing questions before the interview so simple, more or usual accumulation. The path to Java advanced Architect is a path to Java advanced architect. The path to Java advanced architect is a path to Java advanced architect. It is a path to Java advanced architect. These include basics, Java collections, JVMS, multi-threaded concurrency, Spring principles, microservices, Netty and RPC, Kafka, diaries, design patterns, Java algorithms, databases, Zookeeper, distributed caching, data structures, and more
1, the JVM
- How many types of garbage collection algorithms are there? What are their corresponding strengths and weaknesses?
- What is the loading process for a class? Briefly describe each step
- What kinds of class loaders are predefined by the JVM? What do they do?
- What is the parental delegation pattern? What does it do?
- What is a memory overflow, a memory leak? What’s the difference between them?
- What are the behaviors that cause class loading operations?
- Introduce common tools provided by the JVM
- What is the difference between Full, Major, and Minor GC?
- When is the Full GC triggered? .
2. Java concurrency
- What are reentrant locks, optimistic locks, pessimistic locks, fair locks, unfair locks, exclusive locks, shared locks?
- How does ThreadLocal work?
- How does ThreadLocal work internally as a thread-isolation method for variables?
- What is the implementation of InheritableThreadLocal?
- And the implementation of the lock in the packet?
- How about exclusive lock ReentrantLock?
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
3. Java collections
- What’s the difference between HashSet and TreeSet?
- What is the underlying implementation of HashSet?
- How does LinkedHashMap work?
- Why do collection classes not implement Cloneable and Serializable interfaces?
- What is an Iterator?
- What is the difference between Iterator and ListIterator?
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
4. Spring Buckets
- Can the life cycle of Spring beans be answered in conjunction with the source code, or in conjunction with the meaning of the life of beans, why does Spring need to find a life cycle
- What common components (at least five) are included in the Spring container, what their roles are, and what their scenarios are; Such as BeanDefinition; Another example BeanDefinitionMap
- How does Spring auto injection work? Can you explain this problem from the source code; What we call automatic injection, how does it work? What’s the pit? How do you get a property not automatically injected
- How does Spring source code handle loop dependencies? Does Spring support circular dependencies? Health condition not supported? What is the principle of support? Can you explain it from the source code?
- How to extend Spring twice, for example by customizing an annotation that implements automatic injection; How can you develop an @xxx yourself to accomplish automatic injection without using @Autowried?
- Which extensions of Spirng are used in mybatis source code? What are the problems that mybatis cannot solve after extending Spring? For example, how to solve the second level cache
- How to extend Spring in eureka source code? For example, how to plug and unplug eureka functions dynamically, which technical points take advantage of Spring, or from source code
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
5, Redis
- What are the Redis persistence mechanisms? What’s the difference? What are the pros and cons?
- Data types supported by Redis
- Why does Redis need to put all data in memory?
- Is Redis single threaded?
- What are the cache invalidation policies of Redis?
- What is cache hit ratio? What are some ways to improve cache hit ratio?
- Redis global command and database management
- Redis designs order application scenarios
- What about Redis cache avalanche?
- What is cache penetration?
- Order of loading AOF and RDB when Redis restarts
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
6. Middleware
- Dubbo complete a call link introduction;
- How many load balancing strategies does Dubbo support?
- How does the Dubbo Provider service Provider control the maximum number of concurrent requests to be executed?
- How many configurations does Dubbo support when starting up?
- How many messaging middleware products do you know? The advantages and disadvantages of each product;
- How does messaging middleware ensure message consistency and retry mechanism?
- Spring Cloud circuit breaker mechanism;
- In contrast to Dubbo, when should Spring Cloud be used?
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
7. Distributed
- How does messaging middleware solve message loss
- Dubbo service request failed
- Does the reconnection mechanism cause errors
- Understanding of distributed transactions
- How to achieve load balancing and what algorithms can be used to achieve it?
- What is the purpose of Zookeeper and how does election work?
- Vertical split of data Horizontal split.
- Zookeeper principles and application scenarios
- They watch mechanism
- How can I handle the redis/ ZK node failure
- How to achieve unique sequence number in distributed cluster
- How to make a distributed lock
- What MQ has been used, how has it been used, how does it compare to other MQS, and is the connection to MQ thread-safe
- How is the data of the MQ system guaranteed against loss
- List all the strategies you can think of for separating databases from tables; How to solve the problem of query of whole table after dividing database and table.
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
8. Database
- MySQL InnoDB storage file structure
- How is the index tree maintained?
- Possible problem with database auto-increment primary key
- MySQL optimization
- Why use B+ tree for mysql index
- Database lock table related processing
- Index Failure Scenario
- How to safely modify the same row under high concurrency? What are optimistic locks and pessimistic locks? What are INNODB row-level locks
- Mysql > database deadlocks
MySQL database 20
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
If you want to interview not flustered, it is good to “practice internal skills”, eat through this “Internet factory Java senior engineer core interview 1000 questions analysis”, there is a need for friends trouble forward after paying attention to the end of the public account can be obtained
Internet big factory Java senior engineer core interview 1000 questions analysis
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
Java Advanced Architecture Interview
The boy finally won the Offer, all by brushing the Internet of 1000 notes of high frequency interview
If you want to interview not flustered, then take good “practice internal skills”, eat through this “Internet factory Java senior engineer core interview 1000 questions analysis”, there is a need for friends trouble to forward after attention to the following public number to obtain
