The most important words
Due to the impact of the epidemic, countless industries have been affected. In the cold winter of the Internet, many programmers have been laid off, and the overall environment is extremely difficult.
After being laid off by the company, I started looking for a job anxiously, bumping into the wall again and again, completely eroding my confidence, and suddenly felt that the interview has become more and more difficult.
So, I began to adjust my status and focus on deepening technical knowledge. It seems that everything has started to turn for the better, and finally I won the p7 post offer.
Ever since, I want to share my learning experience and interview experience summarized by dozens of Internet companies in the last month of 2020 with my colleagues (Java programmers). I hope you will enjoy the warmth of spring next year. bloom!
Deeply cultivate technology, gnaw down 22 technical points
The Internet industry is renewing very quickly, and the industry's normal state is continuous learning, so you can't leave any of these mainstream technologies!
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① Concurrent programming
Java concurrent programming is the most difficult to understand in the entire Java development system, but it is also one of the most important knowledge points. Therefore, it is more difficult to learn, which causes many people to stay away. However, whether it is a workplace interview or the implementation of a high-concurrency and high-traffic system Inseparable from concurrent programming, talents who can truly master concurrent programming are in short supply in the market.
②JVM
The meaning of JVM is to achieve cross-platform, and JVM is also a technology that middle and senior programmers must master. Basically, interviews must ask. Learning JVM is also for a deeper understanding of Java. In many cases, you have to analyze a problem at the bytecode level before you can get an accurate conclusion. The bytecode is part of the virtual machine. Finally, it is also to better solve online troubleshooting problems in the future.
③Netty
Netty is currently the most popular high-performance Java network programming framework with a wide range of applications. The underlying technologies including RocketMQ, Kafka, elasticsearch, and Dubbo all use the Netty framework. Through the study of Netty, you can also exercise your programming thinking, and play an integrated role in other Java knowledge systems.
④Data structure and algorithm
I believe that many people who have had interviews with big factories have felt that now big factories are paying more and more attention to algorithm interviews, but it is because it is fairer and can see your coding ability and thinking ability.
⑤MySQL
MySQL, as an open source lightweight database, is more popular among open source databases because it is free of charge and compact and easy to install. It is often used in Internet companies and is often asked in interviews. The better SQL statements are written, the more popular you are!
⑥Redis
At present, most of the company's storage is mysql + redis, mysql as the main storage, redis as the auxiliary storage is used as a cache to speed up access and read speed, improve performance.
⑦Spring
Spring is undoubtedly the most important technology for us who are engaged in Java. It is not too much to say that learning Java is learning Spring. It is almost difficult for a programmer who does not know Spring to find a job. Spring is the core of the Spring family and the foundation of SpringBoot. It’s over with a deep bite.
Spring source code analysis:
⑧SpringMVC
⑨MyBatis
When there is no MyBatis, we traditionally use JDBC. With MyBatis, we only need to provide SQL statements. The rest, such as establishing a connection, operating Statment, and other JDBC-related exceptions, are all handled by MyBatis.
⑩Dubbo
Dubbo is Alibaba's open source distributed service framework. Its biggest feature is that it is structured in a layered manner. In this way, the various layers can be decoupled (or loosely coupled to the maximum).
⑪Spring Boot
SpringBoot itself does not provide the core features and extended functions of the Spring framework, but is only used to quickly and agilely develop a new generation of applications based on the Spring framework. At the same time, it integrates a large number of commonly used third-party library configurations (such as redis, mongoDB, JPA, RabbitMQ, Quartz, etc.). These third-party libraries in SpringBoot are used out of the box with almost zero configuration, and only a very small amount of configuration code is required. You can focus more on business logic.
The advantages are obvious:
- Make development easier, provide rich solutions, and quickly integrate various solutions to improve development efficiency;
- Make the configuration simple, provide a wealth of Starters, integration of mainstream open source products often only requires simple configuration;
- It makes deployment simple. It embeds the startup container itself, and only needs one command to start the project. It is very easy to implement combined with Jenkins and Docker automated operation and maintenance;
- To make monitoring simple, with its own monitoring components, use Actuator to easily monitor the status of the server.
⑫Spring Cloud
The SpringCloud project is different from other Spring's excellent projects. It is no longer a basic framework class, but
a higher-level, comprehensive large-scale project with an architectural perspective. Its goal is to build a set of standardized microservice solutions
, allowing When architects and developers use the concept of microservices to build application systems, they
can find corresponding components to deal with problems in all aspects . To quote a metaphor that netizens jokingly called: Spring Cloud can be said to be
a
"family bucket" package provided by the Spring community for the microservice architecture . As the "package" components in the package by a community
install and integrate, making the fit between the various components of the "package" become more harmonious, which can effectively reduce our group in the
energy spent on the selection and integration of parts, So it can help us quickly build a basic microservice architecture system.
⑬Spring Cloud Alibaba
The reason for learning SpringCloud Alibaba is: Compared with SpringCloud, the various components in the SpringCloud Alibaba technology stack have better performance. Many technologies are products that have been open sourced through continuous summarization and optimization after many years of testing on Double 11 and Double 12. It is based on the above two very important reasons that it is necessary for us to learn SpringCloud Alibaba technology.
⑭Docker
Docker is the world's leading software container platform.
Developers can use Docker to eliminate the problem of "works on my machine" during collaborative coding.
Operation and maintenance personnel can use Docker to run and manage applications in parallel in isolated containers to obtain better computing density.
Enterprises can use Docker to build agile software delivery pipelines, and release new features for Linux and Windows Server applications with faster speed, higher security, and reliable reputation.
⑮K8S
Containers provide application-level host abstraction; Kubernetes provide application-level cluster abstraction.
⑯MongoDB
⑰Nginx
Nginx is a high-performance http server/reverse proxy server and email (IMAP/POP3) proxy server. The official test nginx can support 50,000 concurrent links, and the consumption of resources such as cpu and memory is very low, and the operation is very stable.
⑱RabbitMQ+RocketMQ
Decoupling, asynchronous, peak clipping
⑲Kafka
⑳Zookpeer
㉑Mycat
㉒ELK
Respond to interviews and keep repeating
Dear readers, due to the length of this article, in order to avoid affecting the reading experience, I will summarize it below. If you need it, please add the following WeChat: (vip23373) Add it to get the download method for free , as a developer. The core knowledge is really not to be missed, so that you can improve your skills in the interview.
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