This article covers the alibaba, tencent, bytes to beat, jingdong, Java interview questions, with a line of Internet companies such as huawei, no matter you are to interview companies or ordinary Internet companies, believe these interview questions must be helpful to you, after all, giant has been the development direction of industry benchmarking, many companies interview, the interviewer will also study companies Especially in recent years, it is particularly obvious that it is an ordinary Internet company, but the interview questions are almost as difficult as big factories.

At the same time, the giant algorithm in the interview must be will be asked, and the algorithm does not only depend on on the back of the paper is useful, it is need to mathematical logic thinking, therefore, small make up for you at the end of the article will be prepared for a very good algorithm learning handbook, the emphasis is on learning thinking methods, few words said, directly to interview questions, selection of companies!

Due to the limitation of the length of the article, it is impossible to show all the interview questions to the Dachang interview questions in the form of words, this article selected some interview questions for you, more JAVA interview questions you can
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Java based

1. What are the several data types in Java and how many bytes they take up?

2. Can the String class be inherited? Why?

3. If both objects have the same hashCode(), equals() must be true, right?

4. Does String belong to the underlying data type?

5. What are the classes of operation strings in Java? What’s the difference between them?

How many IO streams are there in Java?

7. What’s the difference between BIO, NIO and AIO?

8. Is HashMap thread-safe? What maps are used in concurrency? What are their internal principles, such as storage methods, HashCode, scalability, default capacity, etc.

9. How to invert a string?

Do abstract classes have to have abstract methods?

11. What is the difference between a normal class and an abstract class?

12. Can abstract classes use final modifiers?

13. What’s the difference between ArrayList and LinkedList?

14.ConcurrentHashMap data structure (required)

15. Volatile (compulsory)

16. How Atomic classes guarantee atomicity (CAS operations)

17. Why use thread pool (compulsory)

Redis

1. Application scenarios of Redis

2. Data types supported by Redis (required)

3. The data structure of the ZSET skip table (compulsory)

4.Redis Data Expiration Policy (compulsory)

5. The specific implementation of Redis LRU expiration strategy

6. How to solve the Redis cache avalanche, cache penetration problem

7.Redis Persistence Mechanism (mandatory)

8. Why is Redis single-threaded?

9. What is cache penetration? How to solve it?

10. How many ways are there for Redis persistence?

11. Why is Redis so fast? (study)

12. How does Redis implement distributed locking?

13. How does Redis optimize memory?

14. What are the Redis weeding strategies?

15. What are the common Redis performance issues? How to solve it?

16. What should be paid attention to in the use of Redis?

ZooKeeper

1. The CAP theorem

2. ZAB agreement

3. Leader election algorithm and process

4. What is Zookeeper?

5. How many deployment modes does ZooKeeper have?

6. How does ZooKeeper ensure the state synchronization between master and slave nodes?

Mysql

1. The basics of the transaction

2. Transaction isolation level (required)

3. How to solve the problem of transaction concurrency (dirty read, phantom read) (compulsory examination)

4.MVCC multi-version concurrency control (required)

5. What are binlog,redolog, and undolog, and what do they do

6.InnoDB row/table locks * the difference between InnoDB and MyISAM, when to select MyISAM

7. Why choose B+ tree as index structure (compulsory)

8. What can be stored in the leaf nodes of the index B+ tree?

9. When the query does not move the (expected) index (required)

10. How SQL is optimized * How SQL is parsed by Explain

11. The order by principle

JVM

1. Runtime data area (memory model) (required)

2. Garbage collection mechanism (compulsory)

3. Garbage collection algorithm (required)

4. Trigger conditions for Minor and Full GC

5. Stop the World in GC (STW)

6. Features and differences of garbage collectors

7. Parental delegate model

JDBC and Parent Delegation Model Relationships

9. What does a complete GC flow look like in a JVM? How does an object progress to the old age

Spring

1.Spring IoC /AOP implementation (compulsory)

2. Implementation of dynamic proxy (compulsory examination)

3. How Spring Resolves Circular Dependencies (Level 3 Caching)

4.Spring post-processor

5. How Spring’s @Transactional is implemented

6.Spring’s transaction propagation level

7. The differences between BeanFactory and ApplicationContext

other

1. How to realize current limiting of high concurrency system

2. Design of high concurrent seckill system

3. How to design load balancing

Operating System

1. The difference between processes and threads

2. Several ways of process synchronization

3. Synchronization between threads

4. What is a buffer overflow? What is the harm and why

5. What kinds of states are there in the process

6. What’s the difference between paging and segmentation

Multithreaded piece

1. Several ways to implement multithreading, what is thread safety

2. Can volatile replace locking?

3. What’s the difference between sleep and wait

4. Sleep (0)

5. The difference between Lock and Synchronized

6. What is the principle of synchronized and where it is commonly used (e.g., the difference between loading static and non-static methods)

Data Algorithms and Structures

supplement

Also will test some computer network and so on. Like message queues, the RPC framework is less well studied. Computer networks are all about layers, TCP/UDP, three handshakes and so on. The operating system is processes and threads, the data structure of processes and how they communicate.

The sorting algorithm of the data structure is also more often tested, the test will let you write a quick row. The rest of the algorithm problem depends on the accumulation of LeetCode. In fact, the algorithm of the non-algorithm post exam is quite simple, many questions are completely to examine whether your intelligence is normal, slightly difficult to involve some algorithm ideas according to the classification of LeetCode topic type, each question to do one or two basic can fully cope with the interview.

I recommend you to learn this video, the system of learning algorithms and data structures all over the network to speak the best data structure algorithm tutorial! After learning this video, we believe that the algorithm interview questions can do with ease!

The last

Interview is job-hopping raise salary the most direct and effective way, immediately gold nine silver ten, you do a good job interview to build planes, work screw ready?

Master these knowledge points, interview in the candidate can be dazzing many, hit 9999 points. Opportunities are for those who have prepared, and only with sufficient preparation can they stand out among the candidates.

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