This year, it feels like time is slipping even faster than usual because of the pandemic. Obviously, once the Spring Festival is over, we will usher in the interview season again. For programmers, the failure of autumn recruitment means a “hard battle” in Gold, silver and silver, but how many are ready for the interview? How much do you know about the interviews of first-tier Internet companies?
Today, a “Java interview test sites complete” the whole network launch, take you familiar with 20+ Internet company interview test sites!
The complete PDF version, please forward it, and add assistant VX: Yunduoa2019 after paying attention to it, or scan the qr code below and follow the guidance of the assistant to obtain it by yourself
This article briefly
The structure of this paper is mainly divided into the following three parts:
- 01 Internet Factory (Alibaba + Baidu + Tencent + Bytedance + Meituan + JINGdong)
- (Basic skills + common technology + technical depth + technical experience + learning ability + working ability + project experience)
- 03 Interview questions reappeared
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01 Internet factory test site
Due to the limited content of the article, it is impossible for the interviewed companies to cover all aspects. Therefore, this paper selects six representative Internet companies, and then makes a detailed analysis of the interviews of these two groups of Internet companies, and summarizes the interview examination points of these Internet companies from a macro perspective.
1.1 Alibaba, Baidu and Tencent
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1.2 Bytedance, Meituan, JINGdong
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02 Java Interview Questions
2.1 Basic Skills (Java foundation + algorithm + Data structure)
Java Basics: Java exception classification and handling + reflection + Annotations + inner classes + generics + serialization + copy
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— Algorithm: Algorithm solution +LeetCod collation (Chinese version)
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— Data structure: stack + queue + linked list + hash table + sorted binary tree + red black tree +BTree+ bitmap
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2.2 Common technologies (Spring series +Mybatis+Redis+MQ+Mysql+ZooKeeper+Docker+ K8S, etc.)
— Spring series: Spring+Spring IOC +Spring AOP+Spring MVC+Spring Boot, etc
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– Mybatis:
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— Redis: cache + data structure and scenario analysis + memory flushing mechanism + persistence mechanism + exception + cluster etc
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— MQ: Concept + Architecture
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MySQL: storage + index + lock + database + transaction
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ZooKeeper: Concept, role, and working principle
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2.3 Technical depth (JVM principle + multi-threading + middleware + distributed cache + framework + source code, etc.)
JVM principles: Thread + memory area + garbage collection + reference +GC+IO/NIO+ class loading etc
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Java multithreaded concurrency: concurrency knowledge + threads + thread pool + lifecycle + lock + blocking queue +CAS, etc
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— Middleware (Tomcat) :
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— Distributed cache: cache avalanche + cache penetration + cache warming + cache update + cache degradation
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Open source framework: Spring+Spring MVC+Mybatis
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— Source code interpretation:
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2.4 Technical experience (high concurrency + distributed architecture design +Mysql database performance optimization + design mode, etc.)
— High concurrency:
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— Distributed architecture design:
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Mysql database performance optimization:
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Design mode: 24 design modes and six design principles
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2.5 Learning ability
- The ability to learn the latest technology
- Active GitHub user, involved in open source projects
- Enjoy the ability to read source code
- The ability to get used to blogging
2.6 Work Ability
- Propulsion and execution
- Business ability and learning ability
- Communication and collaboration skills
- Analytical and problem solving skills
- Ability to work under pressure and challenge
- The innovation ability
2.7 Project Experience
In the interview of a large factory, the interviewer attaches great importance to personal project experience and will ask questions one by one about the details of the project. Therefore, it is necessary to make preparations for project-related questions. I only summarize and share experience with some reference projects, so that I can learn the ideas.
— Xiaomi B2C mall system: distributed architecture design + solutions for high concurrency scenarios + strategies for distributed transaction scenarios + solutions for distributed scenarios + performance tuning
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— Meituan merchant distributed marketing system: system architecture design + core high-concurrency module + distributed servialization + database performance improvement + million-level QPS reading + 100,000-level TPS data security
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— Online 1 million concurrent Spring Cloud Alibaba desensitization actual project: Spring Cloud Alibaba actual online project + distributed scene realization + project high-concurrency problem actual practice + project massive data problem actual practice
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03 Interview questions reappeared
3.1 Take Ali’s interview as an example:
- Let’s talk about the difference between a List and a Set
- How is a HashSet guaranteed not to repeat itself?
- Is HashMap thread safe? Why not thread-safe?
- Expansion process of HashMap
- What is the difference between HashMap 1.7 and 1.8?
- Four kinds of references to objects
- Java gets reflection in three ways
- Java reflection mechanism
- Arrays.sort and collections. sort
- The application of LinkedHashMap
- Cloneable interface implementation principle
- Exception classification and handling mechanism
- The difference between ‘wait’ and ‘sleep
- How are arrays allocated in memory?
- .
Answers to interview questions
3.2 More Interview questions for First-tier Internet Companies:
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conclusion
As a “good soldier”, I never fight a battle unprepared, after all, only to know your enemy. No matter what level you are at and how deep your skills are, you have to admit that you need to take the initiative to learn at any time and prepare for the interview in advance. If you have a long-term plan for your career development, it’s important to take a steady, down-to-earth approach.
Next year’s golden three silver four, if you need to interview the plan, so first check how much you prepared?
I wish you all the best.
The complete PDF version, please forward it, and add assistant VX: Yunduoa2019 after paying attention to it, or scan the qr code below and follow the guidance of the assistant to obtain it by yourself
