Two days ago, a small partner left a message in the background. The recent interviews have become more and more difficult, especially the technical aspects.
Generally, technical interviewers will use their own methods to examine the technical skills and basic theoretical knowledge of programmers
Than if such a question:
- Are you familiar with the implementation principles of the project framework, Spring, Mybatis and other frameworks?
- Have you come into contact with technologies such as message middleware, load balancing, and RPC framework? Has MySQL sub-database and table been done?
- Distributed architecture design, is Redis distributed lock involved?
- ...... (1W words omitted here)
In many cases, the questions asked by the interviewer will be different from the questions in the "question bank" prepared by myself. Even after a review, I still don't know where to start the next interview.
In response to the above questions, I specifically found a "Java Job Interview Surprise Lecture", which covers: computer foundation, Java, JVM, spring, algorithm, micro-service, distributed, big factory experience, technical brain map, etc.. .A total of 1600+ pages are of very high quality! ! !
Regardless of whether you want to go to an interview recently, it is recommended that everyone keep a copy! ! After finishing the study, whether it is promotion in the factory or job-hopping and salary increase is no problem!
First look at the general content of "Java Job Interview Surprise Lecture": Java foundation, JVM, multithreading, MySQL, Spring, SpringBoot, SpringCloud, Dubbo, Mybatis, Redis, network, Linux, MQ, Zookeeper, Netty, big data, algorithm And data structures, design patterns, project practice, resume templates, and more.
Because there are too many details in the notes, after all, there are nearly 1,700 pages of documents, so I can only pick out some chapters in the knowledge points and introduce them. The small nodes of each chapter have more detailed content!
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 interface
- HashMap
- Multithreading
- java exception
- Tomcat
- concurrent programming
- Java basic interview questions
JVM part
- The main components of the JVM and what they do
- stack difference
- Dealing with Concurrency Security Issues
- out of memory exception
- JVM memory model, GC mechanism and principle
- parent delegation
- deep copy and shallow copy
- JVM performance tuning
- thread
- JVM memory area
- JVM runtime memory
- Garbage Collection and Algorithms
- Java four reference types
- GC Generational Collection Algorithm VS Partition Collection Algorithm
- GC garbage collector
- JAVA IO/NIO
- JVM class loading mechanism
- JVM interview high-frequency questions
multithreaded part
- The basic concept of thread, program and process. and their relationship
- The basic state of the thread
- How threads are created
- Principle of thread pool
- thread life cycle
- thread safety
- Usage of the volatile keyword: make variables in multiple threads visible
- The usage scenarios and principles of volatile and ThreadLocal
- The difference between synchronized and volatile
- Synchronized lock granularity, simulated deadlock scenario
- Java concurrency and parallelism
- How to effectively increase the amount of concurrency
- The way of process communication: message queue, shared memory, semaphore, socket communication, etc.
- thread communication
- Concurrent, synchronous interfaces or methods
- Synchronization locks and deadlocks
- Process Scheduling Algorithm
- CAS
- AQS
- NIO
- Multi-threaded interview high-frequency questions
MySQL section
- Database Basics
- type of data
- engine
- index
- affairs
- Lock
- view
- stored procedures and functions
- trigger
- Commonly used SQL statements
- SQL optimization
- Database structure optimization
- MySQL locks: pessimistic locks, optimistic locks, exclusive locks, shared locks, table-level locks, row-level locks
- The principle of distributed transactions 2-phase commit, synchronous asynchronous blocking non-blocking
- Database transaction isolation level, the default isolation level of MySQL
- How does Spring implement transactions
- How JDBC implements transactions
- Distributed transaction implementation
- The entire analysis of SQL, the principle of execution process, and SQL row-to-column conversion
- Implementation principle and application scenarios of red-black tree
- MySQL sub-table self-increment ID solution
- Understand the distributed id generation algorithm SnowFlake
- The data structure and algorithm principle behind the MySQL index
- MVCC
- Clustered index of MySQL index principle
- The difference between relational and non-relational databases
- MySQL interview frequently asked questions
Spring part
- Spring lOC
- The principle of Spring AOP
- Spring AOP two proxy methods
- How does Spring ensure the security of Controller concurrency?
- What design patterns are used in Spring?
- Understanding of Spring IOC, its initialization process?
- Spring's transaction management
- Spring MVC overview Spring overview
- Spring Inversion of Control (IOC)
- Spring annotations
- Spring data access
- Spring aspect-oriented programming (AOP) what is AOP
- SpringMVC interview questions
- Principles of Spring MVC
- Spring data access
- Principles of Spring
- Spring Core Components
- Spring interview high-frequency questions
Spring Boot part
- Spring Boot overview configuration
- Safety
- Compare the advantages and disadvantages of Spring Security and Shiro
- Spring Boot solves cross-domain problems
- monitor
- Integrate third-party projects
- Spring Boot implements exception handling
- Spring Boot Features
- Principles of Spring Boot
- Spring Boot implements timing tasks
- What improvements does Spring Boot make over Spring?
- 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
- Spring Boot classic interview questions
Spring Cloud part
- What is Spring Cloud
- Why do you need to learn Spring Cloud
- Development prospect of Spring Cloud
- Spring Cloud compared with Dubbo, in what scenario should Spring Cloud be used?
- Introduction to Spring Cloud Fuse Mechanism
- CAP principle and BASE theory
- Distributed transactions, distributed locks
- Design goals and advantages and disadvantages
- Overall structure
- Spring Cloud Config
- Spring Cloud Netflix
- Spring Cloud Bus
- Spring Cloud Sleuth
- Spring Cloud Stream
- Spring Cloud Task
- Spring Cloud OpenFeign
- Version relationship of Spring Cloud
- The difference between SpringBoot and SpringCloud?
- What does service registration and discovery mean? How does Spring Cloud implement it?
- What is the meaning of load balancing?
- What is Hystrix? How does it achieve fault tolerance?
- What is Netflix Feign? What are its advantages?
- The role of Spring Cloud circuit breaker
- Spring Cloud interview questions
Dubbo part
- basic knowledge
- architecture design
- registration center
- cluster configuration
- letter of agreement
- Design Patterns
- Operation and maintenance management
- SPI
- Distributed System Principles
- Dubbo's complete one-call link introduction
- How many load balancing strategies does Dubbo support?
- Which protocols does Dubbo support, the application scenarios, advantages and disadvantages of each protocol?
- How to set the timeout period of Dubbo? What registration centers does Dubbo have?
- What are the strategies for Dubbo cluster load balancing? What is Dubbo?
- Dubbo's main application scenarios? Dubbo's core functions? Dubbo's core components?
- What is the process of Dubbo service registration and discovery?
- Architecture design of Dubbo?
- Dubbo framework design—a total of 10 layers are divided: Dubbo's service call process?
- Which protocols does Dubbo support, the application scenarios, advantages and disadvantages of each protocol?
- What registration centers does Dubbo have?
- Why is Service Governance needed?
- The relationship between Dubbo and Spring
- Difference Between Dubbo and Dubbox
- The relationship between Dubbo and Spring Cloud
- The difference between Dubbo and Spring Cloud
Mybatis part
- JPA principle
- Introduction to MyBatis
- Mybatis cache
- Mybatis's first-level cache principle (sqlsession level)
- MyBatis cache
- MyBatis data source and connection pool
- Analysis and operation principle of MyBatis
- Spring MVC running process
- What is MyBatis?
- Talk about MyBatis cache
- How does Mybatis paginate? What is the principle of the pagination plugin?
- Briefly describe the operating principle of Mybatis plug-ins, and how to write a plug-in?
- Why is Mybatis a semi-automatic ORM mapping tool? What is the difference between it and fully automatic?
- How is MyBatis different from Hibernate?
- What are the benefits of MyBatis?
- Briefly describe the mapping relationship between Mybatis Xml mapping file and Mybatis internal data structure
Redis part
- 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 Redis clusters are synchronized
- What is the data addition process of Redis: hash slot
- What are the elimination strategies of Redis
- Redis Cluster Basics
- Redis Cluster master-slave mode
- Why is Redis so fast?
- What are the problems with Redis using multithreading?
- Which data structures does Redis support Redis jump table?
- Redis is single-process and single-threaded, how can it be highly concurrency?
- How does Redis use Redis to implement distributed locks?
- How is the atomicity of Redis distributed lock operation implemented inside Redis?
network part
- 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
- Tell me about the browser access to http://www.taobao.com , what kind of process has it gone through
- HTTP protocol, HTTPS protocol, SSL protocol and complete interaction process
- Detailed explanation of the principle of Ping process
- TCP/IP protocol detailed notes - ARP protocol and RARP protocol
- The process of DNS domain name resolution
- Four processes of Http session
- Network 7-layer architecture
- Principle of TCP/IP
- TCP three-way handshake/four-way wave
- HTTP principle
- CDN principle RPC
- Znode has four forms of directory nodes
- load balancing
- Layer 4 Load Balancing vs Layer 7 Load Balancing
- Negative Balance Algorithm/Strategy
- LVS
- Keepalive
- Nginx reverse proxy load balancing
Linux part
- what is linux
- What is the difference between Unix and Linux?
- What is the Linux kernel?
- What are the basic components of Linux?
- Linux architecture
- What is the basic difference between BASH and DOS?
- Linux boot process?
- What is the default run level of the Linux system?
- What method of interprocess communication does Linux use?
- What system log files does Linux have?
- Does it help to install multiple desktop environments on a Linux system?
- What is swap space?
- What is the root account and what is LILO?
- What are CLIs?
- What are GUIs?
- What are the advantages of open source?
- What is the importance of the GNU project?
- disk, directory, file
- Safety
- Shell
- disk management command cd command
- swap partition
- overcommit_memory
- Check the CPU and memory load under the Linux system
- classic interview questions
message middleware part
- Why use 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 of MQ? How to solve these problems?
- What is RabbitMQ?
- Rabbitmq usage scenarios
- Basic concepts of RabbitMQ
- Working mode of RabbitMQ
- How to ensure the order of RabbitMQ messages?
- How is the message distributed?
- How are messages routed?
- What transport is the message based on?
- How to ensure reliable transmission of RabbitMQ messages?
- How to ensure that messages are not repeatedly consumed? In other words, how to ensure the idempotency of message consumption?
- Design MQ Ideas
- How does the message middleware ensure the consistency of the message and how to implement the message retry mechanism?
- delivery guarantee semantics
- "Exactly once" semantic scheme for producers
- "Exactly once" semantic scheme for consumers
- ISR collection
- Please explain what is Apache Kafka?
- Please explain what is the traditional messaging method?
- Please explain what advantages Kafka has over traditional technologies?
- What is the meaning of broker in Kafka?
- What is the maximum message that the Kafka server can receive?
- Explain what is Zookeeper for Kafka? Can we use Kafka without Zookeeper?
- Explain how users of Kafka consume information?
- Explain how to improve throughput for remote users?
Zookeeper part
- 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 registration Watcher implementation
- Server-side processing Watcher implementation
- Client callback Watcher
- ACL permission control mechanism
- Chroot Features
- session management
- server role
- Server working status data synchronization under Zookeeper
- How does zookeeper guarantee the order-consistency of transactions?
- Why is there a Master master node in a distributed cluster?
- How to deal with ZK node downtime?
- What are the deployment modes of Zookeeper?
- What are the Java clients of Zookeeper?
- What is Chubby, and what do you think of it compared with zookeeper?
- Say a few zookeeper'commonly used commands.
- The connection and difference between ZAB and Paxos algorithm?
- Typical application scenarios of Zookeeper What are the functions of Zookeeper?
- Tell me about Zookeeper's notification mechanism?
- The relationship between Zookeeper and Dubbo?
- How to communicate between Zookeeper clusters
- Zookeeper interview questions
Netty part
- Introduction to Netty
- Netty high-performance design
- Netty architecture design
- Netty interview questions
- What is Netty?
- What are the characteristics of Netty?
- What are the advantages of Netty?
- What are the application scenarios of Netty?
- What are the aspects of Netty's high performance?
- What is the difference between BIO, NIO and AIO?
- What is NIO made of?
- Netty's threading model?
- Reasons and solutions for TCP sticky/unpacking?
- What is Netty's zero-copy?
- What kind of important components are there in Netty?
- How many ways does Netty send messages?
- How many threads does Netty start by default? When does it start?
- What serialization protocols do you know?
- How to choose a serialization protocol?
- What heartbeat type settings does Netty support?
- What is the difference between Netty and Tomcat?
- NIOEventLoopGroup source code?
- Netty principle
- Netty RPC implementation
- Netty classic interview questions
big data part
- Hadoop
- SPARK concept
- SPARK Core Architecture
- SPARK Core Components
- SPARK programming model
- SPARK Computational Model
- SPARK running process
- SPARK RDD process
- SPARK RDD
- Storm
- cluster architecture
- YARN
- The principle of load balancing
- Principles and Implementation of Six Web Load Balancing
- http redirection
- DNS negative balance
- Reverse proxy load balancing
- IP load balancing (LVS-NAT)
- Direct Routing (LVS-DR)
- IP tunnel (LVS-TUN)
- Tomcat concurrency
- Exchange type
- base concept
- columnar storage
- Hbase core concept
- Hbase core architecture
- Hbase write logic
- HBase vs Cassandra
- CLH queue
Algorithms and Data Structures Section
- red black tree
- Application of red-black tree on STL
- AVLtree
- binary search tree
- Definition of red-black tree
- B-tree definition
- B+ tree
- Trie tree ((dictionary tree)
- The difference between greedy algorithm and dynamic programming
- BitMap literally means
- Bitmap application
- Bitmap sorting complexity analysis
- BitMap Algorithm Process
- BitMap Algorithm Evaluation
- Seven Search Algorithms
- — Consistency Algorithm
- JAVA algorithm
- data structure
- Encryption Algorithm
- sequential search
- binary search
- interpolation lookup
- Fibonacci lookup
- tree table lookup
- block search
- hash lookup
Project actual combat part (complete project white paper + video + source code)
- log
- Slf4j
- Log4j
- LogBack
- Taking online car-hailing as an example, cut into distributed projects
- Demand Analysis of Internet High Concurrency Projects
- Business loopholes in high-concurrency scenarios, a correct understanding of technology-enabled business
- High concurrency microservice architecture design in actual production projects
- Reasonably formulate business architecture diagrams to support high concurrency and scalability challenges
- How to Precipitate Mid-Taiwan Capabilities in Project Development
- Project dismantling technology selection and technical architecture diagram
- Design of order dispatching function in online car-hailing business
- Open platform interface design in online car-hailing
- Application of CAP Theorem in Actual Production
- On the guarantee of data consistency in online car-hailing: distributed locks
- Data Consistency Guarantee in Online Car Hailing: Distributed Transactions
design pattern section
- 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
- combination mode
- Observer pattern
- facade mode
- memo mode
- visitor pattern
- state mode
- interpreter mode
- Flyweight mode
- bridge mode
- template method pattern
Due to the limited space of the platform, more and more detailed content cannot be displayed one by one. We can only briefly introduce some of the content (after all, there are nearly 2,000 pages of documents). The following is a screenshot of some of the content
Ps: Due to space limitations, all the notes cannot be displayed for everyone, so let everyone refer to them in the form of screenshots of the main content