Affected by the epidemic, this year seems to give people the impression that time is passing faster than in previous years. Obviously, as soon as the Spring Festival is over, we will usher in the peak interview season of gold and silver. For programmers, the failure of the autumn recruits even means a "hard battle" in the gold three silver four, but how many people are ready for the interview? How much do you know about interviews with first-tier Internet companies?
Today, a book of "Java Interview Test Sites" is published on the whole network, which will take you to familiarize yourself with the interview test sites of 20+ Internet companies!
Due to limited space, the following content will only show part of the content and screenshots of "Java Interview Test Sites" + "Internet Interview Questions". Friends who need the full version can add vx\: Mxy98811 for free
Summary of this article
The structure of this article is mainly divided into the following three parts:
- 01 Test sites for major Internet companies (Ali+Baidu+Tencent+ByteDance+Meituan+JD)
- 02 Java interview test sites (basic skills + common skills + technical depth + technical experience + learning ability + work ability + project experience)
- 03 Real interview questions reproduce
01 Test sites for major Internet companies
Due to the limited content of the article, it is impossible for the interviewed companies to cover everything, so here we select 6 representative Internet companies, and then conduct a detailed analysis of the interviews of these two echelon Internet companies, and use a macro perspective to compare The interview test sites of these Internet companies have been summarized.
1.1 Alibaba, Baidu, Tencent
1.2 ByteDance, Meituan, JD
02 Java Interview Test Sites
2.1 Basic skills (Java basis + algorithm + data structure)
——Java foundation: Java exception classification and processing + reflection + annotation + internal class + generic + serialization + copy
——Algorithm: Algorithm problem solving + LeetCod finishing (Chinese version)
——Data structure: stack + queue + linked list + hash table + sorted binary tree + red-black tree + BTree + bitmap
2.2 Common technologies (Spring series+Mybatis+Redis+MQ+Mysql+ZooKeeper+Docker+k8s, etc.)
——Spring系列：Spring+Spring IOC +Spring AOP+Spring MVC+Spring Boot等
——Mybatis：
——Redis: cache + data structure and scene analysis + memory elimination mechanism + persistence mechanism + exception + cluster, etc.
——MQ: Concept + Architecture
——MySQL: storage + index + lock + sub-database sub-table + transaction, etc.
——ZooKeeper: Concept + Role + Working Principle
2.3 Technical depth (JVM principle + multithreading + middleware + distributed cache + framework + source code, etc.)
——JVM principle: thread + memory area + garbage collection + reference + GC + IO/NIO + class loading, etc.
——Java multi-threaded concurrency: concurrency knowledge + thread + thread pool + life cycle + lock + blocking queue + CAS, etc.
——Middleware (Tomcat):
——Distributed cache: cache avalanche + cache penetration + cache warm-up + cache update + cache degradation
——Open source framework: Spring+Spring MVC+Mybatis
——Source code interpretation:
2.4 Technical experience (high concurrency + distributed architecture design + Mysql database performance optimization + design mode, etc.)
--High concurrency:
——Distributed architecture design:
——Mysql database performance optimization:
——Design patterns: 24 design patterns and six design principles
2.5 Learning ability
- Ability to learn the latest technology
- Active GitHub user, participated in open source projects
- Like the ability to read source code
- Ability to blog
2.6 Work ability
- Impetus and execution
- Business ability and learning ability
- Communication skills and collaboration skills
- Analytical skills and problem-solving skills
- Ability to withstand pressure and challenge
- Creativity
2.7 Project experience
In interviews with large factories, the interviewer values personal project experience very much, and will also ask questions one by one about the details of the project. Therefore, you need to prepare yourself for project-related questions. Individuals only carry out some reference projects. Summary and experience sharing, you can learn the ideas.
——Xiaomi B2C Mall System: Distributed Architecture Design + High Concurrency Scenario Response Plan + Distributed Transaction Scenario Strategy + Distributed Scenario Plan + Performance Tuning
——Meituan Distributed Marketing System for Merchants: System Architecture Design + Core High Concurrency Module + Distributed Servicization + Database Performance Improvement + Million-level QPS Reading + One-hundred-thousand-level TPS Data Security
——One million concurrent online Spring Cloud Alibaba desensitization actual project: Spring Cloud Alibaba actual online project + distributed scenario implementation + project high concurrency problem actual combat + project massive data problem actual combat
03 Real interview questions reproduce
3.1 Take Ali interview questions as an example:
- Talk about the difference between List and Set
- How does HashSet guarantee non-repetition?
- Is HashMap thread safe? Why is it not thread safe?
- HashMap expansion process
- The difference between HashMap 1.7 and 1.8, explain what optimizations have been made in 1.8 and how to optimize them?
- Four references to objects
- Three ways to get reflection in Java
- Java reflection mechanism
- Arrays.sort and Collections.sort implementation principles and differences
- Application of LinkedHashMap
- Cloneable interface implementation principle
- Exception classification and handling mechanism
- The difference between wait and sleep
- How is the array allocated in memory?
- ......
Interview Question Answer
3.2 More interview questions for major Internet companies:
to sum up
As a "good soldier", I never fight unprepared battles. After all, knowing myself and the enemy can do my best. No matter what level you are at now and what depth of technology you have, you have to admit that you need to be able to learn actively at any time, and you must also prepare in advance for the interview. If you have a longer-term plan and plan for your career development, you should calm down, down-to-earth, step by step.
Next year’s gold three silver four, if you have plans to interview, then first check how much you have prepared?
The above "Java Interview Test Site Collection" is given to you, and I wish you all the best.
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