I have been moving bricks for several years, and I plan to change jobs in the second half of the year, and I am very close to the "Golden September and Silver October" ...
Are Java interviews just memorizing answers?
Of course, you have to memorize Java stereotyped essays in the interview. If you don’t memorize, you will not pass the interview.
Due to the economic environment, competition in the Internet industry is becoming more and more severe, and interviews are becoming more and more difficult. There are more and more technologies that we need to master, and the requirements are getting higher and higher. As a senior Internet code farmer, today I will share with you the latest and most complete stereotyped Java interview essay!
In order to better cope with the current severe industry situation, I have brought in a dozen bigwigs , summarized the situation of the first-tier manufacturers, and compiled a set of super-comprehensive interview materials for you: 1658 pages of knowledge points contained in the core technology stack of the Java interview It is also relatively comprehensive: Java foundation, JVM, multithreading, MySQL, spring, springboot, springcloud, dubbo, mybatis, redis, network IO, Linux, MQ, zookeeper, netty, big data, algorithms, projects, design patterns, etc .; After finishing this set of high-quality question sets, this interview is complete~
Since there are too many details in the "Java Interview Core Technology Stack" manual, after all, there are nearly 2000 pages of documents, so I can only pick out some chapters in the knowledge points and introduce them. There are more detailed information in the small nodes of each chapter . Content! The following is the catalog of some knowledge points. Due to the space limitation of the platform, the detailed explanations on the sub-nodes cannot be fully displayed. All the detailed knowledge explanations in the following chapters are available at the end of the article .
Due to space limitations, the detailed information in the pdf document is too comprehensive, and there are too many details, so I only take screenshots of some knowledge points for a rough introduction, and each small node has more detailed content!
Readers and friends in need can help Sanlian to support it, and reply to [Learning] by private message to get started~
Java basics:
- Java overview
- basic grammar
- object oriented
- Classes and Interfaces
- variables and methods
- inner class
- rewriting and overloading
- Object Equality Judgment
- pass by value
- Java package
- I流
- reflection
- Common APIs
- Collection container overview
- Collection interfaceMap interface
JVM:
- Tell me about the main components of the JVM and their functions?
- Talk about the JVM runtime data area
- deep copy and shallow copy
- Tell me about the difference between stacks?
- What are queues and stacks? What's the difference?
- object creation
- allocate memory for the object
- Dealing with Concurrency Security Issues
- Object access location
- JVM memory area
- JVM runtime memory
- Garbage Collection and Algorithms
- Reference types in Java 4
- GC Generational Collection Algorithm VS Partition Collection Algorithm
- GC garbage collector
- JAVA IO/NIO
- JVM class loading mechanism
Multithreading:
- JAVA multi-thread concurrency
- JAVA thread implementation/creation method
- 4 thread pools
- Thread life cycle (state)
- 4 ways to terminate threads
- The difference between sleep and wait
- The difference between start and run
- JAVA background thread
- JAVA lock
- Thread Basic Methods
- thread context switch
- Synchronization locks and deadlocks
- Principle of thread pool
- JAVA blocking queue principle
MySQL:
- Database Basics
- type of data
- engine
- index transaction
- Lock
- view
- stored procedures and functions
- trigger
- Commonly used SQL statements
- SQL optimization
- Database structure optimization
Spring:
- Principle of Spring
- Spring features
- Spring Core Components
- Spring common modules
- Spring main package
- Spring Common Annotations
- Spring third-party integration
- Principle of Spring IOC
- spring APO principle
- Principles of Spring MVC
- Implementation principles and scenarios of Spring AOP;
- The scope and life cycle of Spring beans;
- What improvements did Spring 5 make over Spring 4;
- The principle of spring MVC
Springboot:
- Spring Boot overview
- configuration
- Safety
- monitor
- Integrate third-party projects
- other
- Principles of Spring Boot
- What improvements did spring BootttSpring make?
- Spring boot hot loading
- Spring Boot sets the effective time and automatically refreshes the cache, and the time support is configured in the configuration file
- The difference between hibernate and ibatis
- Talk about the connection pool of mybatis.
Springcloud:
- Introduction to Spring Cloud fuse mechanism;
- Compared with Spring Cloud and Dubbo, in what scenarios should Spring Cloud be used?
- CAP principle and BASE theory
- Distributed transactions, distributed locks
- Spring Cloud interview questions
- Why do you need to learn Spring Cloud
- What is Spring Cloud
- Design goals and advantages and disadvantages
- Development prospect of Spring Cloud
Dubbo:
- basic knowledge
- architecture design
- registration center
- cluster
- configuration
- letter of agreement
- Design Patterns
- Operation and maintenance management
- SPI
- Dubbo's complete one-call link introduction;
- How many load balancing strategies does Dubbo support?
My shoe:
- JPA principle
- Mybatis cache
- Mybatis's first-level cache principle (sqlsession level)
- MyBatis cache
- MyBatis data source and connection pool
- Introduction to MyBatis
- Analysis and operation principle of MyBatis
- Spring MVC running process
- What is MyBatis?
- Talk about the cache answer of MyBatis
Redis:
- Redis overview
- type of data
- Persistence
- Deletion strategy for expired keys
- memory related
- Partition
- distributed problem
- other problems
- How does message middleware ensure message consistency
- How to implement the message retry mechanism?
- Redis data types
- How does the redis cluster synchronize
- What is the data addition process of redis: hash slot
Network I/O:
- computer network architecture
- TCP/IP four-layer architecture. TCP/IP protocol family
- common interview questions
- Socket communication, as well as long connection, subpackage, and connection abnormal disconnection processing.
- In http, the difference between get post
- HTTP message content
Linux:
- Linux overview
- Does it help to install multiple desktop environments on a Linux system?
- What is swap space?
- What is the root account
- What is LILO?
- What are CLIs?
- What are GUIs?
- What are the advantages of open source?
- What is the importance of the GNU project?
RocketMQ：
- Why use MQ? Advantages of MQ
- What are the advantages and disadvantages of message queues? What are the advantages and disadvantages of RabbitMQ?
- What message middleware does your company use in the production environment?
- What are the advantages and disadvantages of Kafka, ActiveMQ, RabbitMQ, RocketMQ?
- What are the common problems with MQ? How to solve them?
- What is RabbitMQ?
- Rabbitmq usage scenarios
- Basic concepts of RabbitMQ
- Working mode of RabbitMQ
- How to ensure the order of RabbitMQ messages?
Zookeeper：
- What is ZooKeeper?
- What does ZooKeeper provide?
- Zookeeper file system
- How does Zookeeper ensure the state synchronization of master and slave nodes?
- Four types of data node Znode
- Zookeeper Watcher Mechanism - Data Change Notification
- Client registers Watcher implementation
- Server-side processing Watcher implementation
- Client callback Watcher
- ACL permission control mechanism
- Chroot Features
Netty：
- Introduction to Netty
- Netty high-performance design
- Netty architecture design
- Netty interview questions
- Netty
- Netty principle
- Netty high performance
- Netty RPC implementation
- Netty classic interview questions
Big Data:
- HadoopSpark
- Storm
- YARN
- The principle of load balancing
- Tomcat concurrency
- Exchange type
- base concept
- columnar storage
- Hbase core concept
- Hbase core architecture
- Hbase write logic
- HBase vs Cassandra
algorithm:
- Understanding of red-black trees (balanced tree, binary search tree), usage scenarios
- Application of red-black tree on STL
- Do you understand and check it? (low frequency)
- The difference between greedy algorithm and dynamic programming
- — Consistent Hash Description
- How to sort 10 billion numbers?
- Hash Divide and Conquer – Statistics of the top 10 IPs with the most occurrences in massive data
- Sorting Algorithm Time Complexity
- Judging whether there is a ring in the linked list ----- Questions about the ring in the single linked list
- The principle of common hash algorithm
- Seven Search Algorithms
- — Consistency Algorithm
- JAVA algorithm
- data structure
- Encryption Algorithm
project:
- log
- slf4j
- Log4j
- LogBack
Design Patterns:
- singleton pattern
- factory pattern
- abstract factory pattern
- builder mode
- prototype pattern
- adapter pattern
- decorator pattern
- Proxy mode
- mediator pattern
- command mode
- chain of responsibility model
- strategy pattern
- iterator pattern
end:
Interview, hard or not? Is the end result good or bad? It depends on the interviewer's background (aura + skills), mentality and cognition, and communication skills. And some mainstream large-scale Internet company interviews (Alibaba, JD.com, Meituan, Didi) require you to show your abilities during the interview, so as to gain the appreciation and affirmation of the interviewer.
And programmers need to go through layers of interviews when applying for a job. As the saying goes, sharpening a knife does not cut firewood by mistake, and doing a good job of preparation before the interview can help you better deal with the interviewer's questions and emergencies during the interview.
Due to space limitations, the detailed information in the pdf document is too comprehensive, and there are too many details, so I only take screenshots of some knowledge points for a rough introduction, and each small node has more detailed content!
Readers and friends in need can help Sanlian to support it, and reply to [Learning] by private message to get started~
It is not easy to sort out, I hope everyone can get their favorite offer after reading this information!