Java Interview Essentials Summary Set
2018-08-11
Turn from: Java interview key points summary set
Article Directory
1.Basic article
1.1.Basic
1.2.Collection
1.3.Thread
1.4. lock mechanism
2. core
2.1. Datastore
2.2. cache use
2.3. Message Queuing
3. frames
3.1. spring
3.2. netty
4. Micro services
4.1. MicroServices
4.2. distributed
4.3. security issues
4.4. performance optimization
5. engineering
5.1. demand analysis
5.2. design capabilities
5.3. design mode
5.4. Business engineering
5.5. soft power
Basic Basics
- Object-oriented features
- Final, finally, finalize the difference
- What is the difference between int and Integer
- The difference between overloading and overriding
- What is the difference between an abstract class and an interface
- Talk about the use and realization of reflection
- Talk about the scenario and implementation of custom annotations
- The difference between the GET and POST methods of HTTP requests
- Session and Cookie Differences
- Session distributed processing
- JDBC process
- MVC Design Ideas
- The difference between equals and = =
Collection
- List and Set differences
- List and Map differences
- The difference between Arraylist and LinkedList
- The difference between ArrayList and Vector
- The difference between HashMap and Hashtable
- HashSet and HashMap differences
- The difference between HashMap and Concurrenthashmap
- Working principle and code implementation of HASHMAP
- Working principle and code implementation of CONCURRENTHASHMAP
Thread
- How to create threads and how to implement them
- What is the difference between sleep (), join (), yield ()
- Talk about the Countdownlatch principle.
- Talk about the cyclicbarrier principle.
- Talk about the Semaphore principle.
- Talk about the Exchanger principle.
- Talk about the difference between Countdownlatch and Cyclicbarrier
- ThreadLocal principle Analysis
- How to implement the thread pool
- Several ways to thread pool
- The life cycle of a thread
Lock mechanism
- Talk about thread safety.
- The principle of volatile implementation
- Synchronize implementation principle Java Concurrency Programming series
- The difference between synchronized and lock lock and synchronized
- CAS optimistic Lock
- ABA issues
- The business scenario of optimistic locking and its implementation method
Core piece data storage
- Considerations for MySQL Index usage
- Talk about anti-pattern design.
- Talking about the design of sub-library and table
- Distributed dilemma and countermeasures brought by sub-database and sub-table
- Talk about the path of SQL optimization
- The deadlock problem encountered by MySQL
- InnoDB and MyISAM of the storage engine
- Principles of database indexing
- Why do you use B-tree
- Differences between clustered and nonclustered indexes in SQL Server table organization and index organization (clustered index structure, nonclustered index structure, heap structure)
- Limit 20000 loading is slow how to solve
- Choosing the right Distributed primary key scheme
- Choose the right data storage solution
- ObjectId rules
- Talk about MongoDB usage scenarios
- Inverted index
- Talk about ElasticSearch usage scenarios
Cache usage
- What types of Redis are there?
- REDIS internal structure
- Talk about Redis usage scenarios
- Redis persistence mechanism
- How Redis achieves persistence
- Redis Cluster scheme and implementation
- Why Redis is a single thread
- Cache Rush
- Cache demotion
- The rationality of using caching
Message Queuing
- Usage scenarios for Message Queuing
- The solution of the message's re-sending compensation
- MQ, how to do the message must reach
- Core Design points: (1) message landed (2) message timed out or lost, re-transmitted, confirmed
- Problem: The last time the client received, but the client was confiscated to confirm, what to do next?
- The idea of power-equal solution of message
- MQ, how to do the message idempotent
- Summarize:
- The first half mq-client generates Inner-msg-id, guaranteeing the first half power. This ID is globally unique, business agnostic, guaranteed by MQ.
- In the second half of the business sent to Biz-id, the business receiver to the power of the security. This ID is unique to the single business, business-related, and transparent to MQ.
- The idea of accumulating messages
- How to implement Message Queuing yourself
- How to ensure the order of messages
Frame article Spring
- What's the difference between Beanfactory and ApplicationContext?
- The life cycle of Spring beans
- How spring IOC implements spring IOC is to instantiate an object by reflection and put it in the container's
- Talk about Spring AOP
- Spring AOP Implementation principles Spring AOP is implemented through dynamic proxies
- Dynamic agents (Cglib and JDK)
- How Spring transactions are implemented
- The underlying principle of Spring transactions
- How to customize annotation implementation features
- Spring MVC Run Process
- Spring MVC Startup process
- Spring's single-instance implementation principle
- What design patterns are used in the Spring framework
- Other Spring Products (srping Boot, Spring Cloud, Spring secuirity, Spring Data, Spring AMQP, etc.)
Netty
- Why Choose Netty
- Talk about the use of Netty in business
- Native NIO has epoll bug in JDK version 1.7
- What is a TCP Sticky pack/unpacking
- Workarounds for TCP sticky/unpacking
- Netty Threading Model
- Tell me about the 0 copies of Netty.
- Netty Internal Execution process
- Netty Re-connected implementation
Micro-service Micro-service
- How the front-end separation is done
- Micro-service which frameworks
- How do you understand the RPC framework
- Talk about the implementation principle of RPC
- Talk about the principle of Dubbo's realization
- How do you understand RESTful
- Talk about how to design a good API
- How to understand the idempotent nature of RESTful APIs
- How to ensure the idempotent of the interface
- Talk about CAP theorem, BASE theory
- How to consider data consistency issues
- Talk about the final consistency of the implementation plan
- What do you think of micro services
- The difference between microservices and SOA microservices, SOA, and API comparison and analysis
- How to split a service
- How MicroServices Perform database management
- How to deal with the chain call exception of MicroServices
- For quick tracking and positioning issues
- Micro-Service Security
Distributed
- Talk about the use of distributed scenarios in business
- Session Distributed Solution
- Scenarios for distributed locks
- Distribution is the implementation scheme of locks
- Distributed transactions
- Algorithm and implementation of cluster and load balancing
- Talking about the design of sub-library and table
- Distributed dilemma and countermeasures brought by sub-database and sub-table
Security issues
- Security elements and STRIDE threats
- Guard against common Web attacks
- Service-side communication security attack
- Analysis of HTTPS principle
- HTTPS downgrade attack
- Licensing and Certification
- Role-based access control
- Data-based access control
Performance optimization
- What are the performance indicators?
- How to discover performance bottlenecks
- The common means of performance tuning
- Tell me about your performance tuning in the project.
Demand analysis of engineering articles
- How do you understand and split the requirements prototype?
- Tell me about your understanding of functional requirements.
- Tell me about your understanding of non-functional requirements.
- What interactions and improvements do you propose for your product?
- How do you understand user pain points
Design capabilities
- Tell me about the UML diagram you used in your project.
- How do you think of the component
- How do you think of service
- How do you do domain modeling
- How do you divide the domain boundaries
- Tell me about your field modeling in your project.
- Talk about the outline design
Design Patterns
- What design patterns are used in your project
- Talk about the use of design patterns in common open source frameworks
- Tell me about your understanding of design principles.
- Design concepts for 23 design patterns
- Similarities and differences between design patterns, such as the difference between a policy pattern and a state pattern
- A combination of design patterns, such as the practice of strategy mode + Simple Factory mode
- The performance of design patterns, such as which performance is better in singleton mode.
Business Engineering
- How the front-end separation in your system is done
- Tell me about your development process.
- How do you communicate with the team?
- How do you conduct code reviews
- Tell me about your understanding of technology and business.
- Tell me about the Exception you often encounter in the project.
- Tell me about the hardest bug you've encountered in the project, how to solve it.
- Tell me about your deepest impression in the project and how to solve it.
- What do you think is the problem with your project?
- Have you ever experienced CPU 100%, how to troubleshoot and resolve
- Have you ever encountered memory OOM, how to troubleshoot and resolve
- Tell me about your practice of agile development.
- Tell me about your practice of devops.
- Describe one of the most valuable projects in your job, and the role in the process
Soft power
- Tell me about your highlights.
- Tell me what book you're reading recently.
- Talk about the technical books that you think are the most meaningful
- What do you do in your spare job?
- Talk about the direction of personal development
- Tell me what you think the capabilities of the service-side development engineer should be.
- Tell me what you think the architect is, what the architect does.
- Tell me about the technical experts you understand.
Java Interview Essentials Summary Set
