Shulou(Shulou.com)06/02 Report--

This article will explain in detail about the Offer-- face pilot JAVA back-end review and finishing, the content of the article is of high quality, so the editor will share it for you to do a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

[module 1] JAVA

1. Java Foundation

Data type classification

Methods of the Object class

The String class has a deep understanding

How does switch case support String

The difference between equals and =

Object-oriented features

The difference between abstract classes and interfaces

The difference between overloading and rewriting

Access modifier

The difference between final, finally and finalize

What's the difference between int and Integer?

Talk about the use and realization of reflection

JDBC process

2. Java collection

The difference between List and Set

The difference between List and Map

The difference between Arraylist and LinkedList

The difference between ArrayList and Vector

The difference between HashMap and Hashtable

The difference between HashSet and HashMap

The difference between HashMap and ConcurrentHashMap

The working principle and Code implementation of HashMap

The working principle and Code implementation of ConcurrentHashMap

3. Java thread concurrency

-Thread

The way and implementation of creating thread

What's the difference between sleep (), join () and yield ()?

Talk about the principle of CountDownLatch

Talk about the principle of CyclicBarrier

Talk about the principle of Semaphore

Talk about the principle of Exchanger

Talk about the difference between CountDownLatch and CyclicBarrier

Analysis of ThreadLocal principle

Talk about the implementation principle of thread pool

Several ways of thread pool

Life cycle of a thread

-- JMM

-- locking mechanism

Talk about thread safety

Principle of volatile implementation

Principle of synchronize implementation

The difference between synchronized and lock

CAS optimistic lock

ABA problem

Business scenario and implementation of optimistic Lock

[module 2] JVM

[module 3] Database

1. Relational database: MySQL

Primary

-- basic grammar use

-- use of basic functions

intermediate

-- SQL execution process

-- intersection, union, subtraction of multiple join, etc.

-- Database design

-- SQL optimization

-- implementation of the plan

-- Index principle

-- B+ tree principle

Advanced

-- principle of master-slave replication

The principle of sub-database and sub-table

-- performance tuning

-- backup and recovery

-- highly available HA solution

2. Key- value database: Redis

[module 4] Design patterns

[module 5] Network Communication

[module 6] Linux

[module 7] frame

1 、 Spring

What's the difference between BeanFactory and ApplicationContext?

Life cycle of Spring Bean

How to implement Spring IOC

Talk about Spring AOP.

Principle of Spring AOP implementation

Dynamic agents (cglib and JDK)

Spring transaction implementation

The underlying principles of Spring transactions

How to customize annotations to implement functions

Spring MVC running process

Spring MVC startup process

The principle of singleton implementation of Spring

What design patterns are used in the Spring framework

2 、 Mybatis

3 、 Spring Boot

4 、 Spring Cloud

5. Micro-service

How to separate the front and rear ends

What are the frameworks of microservices?

How do you understand the RPC framework?

Talk about the implementation principle of RPC

Talk about the implementation principle of Dubbo

How do you understand RESTful?

Talk about how to design a good API

How to understand the idempotency of RESTful API

How to ensure the idempotency of the interface

Talk about CAP Theorem and BASE Theory

How to consider data consistency

Talk about the realization scheme of the final consistency

What do you think of microservices?

The difference between micro-service and SOA

How to split a service

How to manage database by micro-service

How to deal with the chain invocation exception of micro-service

For fast tracking and positioning problems

Security of microservices

6. Distributed

Talk about the scenario of using distribution in business

Session distributed scheme

Scenarios of distributed locks

Distribution is the implementation scheme of lock

Distributed transaction

Algorithm and implementation of Cluster and load balancing

Talk about the design of sub-library and sub-table

The distributed predicament caused by sub-database and sub-table and its countermeasures

[module 8] Middleware

[module 9] algorithm

[module 10] Engineering part

Demand analysis

How do you understand and split the requirement 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 the product?

How do you understand the pain points of users?

Design ability

Tell me about the UML diagram you used in the project.

How do you consider componentization?

How do you think about service?

How do you do domain modeling

How do you demarcate domain boundaries

Tell me about the domain modeling in your project

Talk about outline design.

Design pattern

What design patterns are used in your project?

Analysis of the use of Design patterns in commonly used Open Source frameworks

Tell me about your understanding of design principles.

The design concept of 23 design patterns

Similarities and differences between design patterns, such as the difference between policy patterns and state patterns

The combination of design patterns, such as the practice of strategy pattern + simple factory pattern

The performance of the design pattern, such as the singleton mode, which is better.

Business engineering

How is the front and rear separation in your system done?

Tell me about your development process.

How do you communicate with the team?

How do you conduct code review

Tell me about your understanding of technology and business.

Tell me about the Exception you often encounter in the project.

Talk about the hardest Bug you feel when you meet in the project, and how to solve it.

Tell me about the most impressive difficulties you encountered in the project and how to solve them

What do you think are the shortcomings of your project?

Have you ever encountered CPU 100% and how to troubleshoot and solve it

Have you ever encountered memory OOM and how to troubleshoot and solve it?

Tell me about your practice of agile development.

Tell me about your practice on development, operation and maintenance.

Introduce a project that is most valuable to you at work, and your role in the process.

Soft power

Tell me about your bright spot.

Tell me what books you've been reading lately.

Tell me about the technical books that you find most meaningful.

What do you do after work?

Talk about the direction of personal development.

Tell me what abilities you think server-side development engineers should have.

Tell me what you think the architect is like and what the architect does.

Tell me about the technical experts you understand.

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