Let me talk about my background first. The company I worked for for a year is an outsourcing company serving the insurance industry. The code framework I mainly wrote is very old, and the code specifications are not too demanding. In terms of technology, I can use it casually, which can be achieved. function can
Introduce yourself first
me: bala bala after a bunch
The interviewer looked up at me, over?
Me: Hmm!
Interviewer: We chat like friends, first of all, you define yourself as a junior or intermediate senior programmer
Me: On the way from beginner to intermediate (why feel good about yourself???)
Interviewer: Okay, let's ask some questions about this, starting with the basics of Java. io stream you know
i: The direction is divided into the input stream. output stream. Size is divided into byte character stream
Interviewer: What interfaces do they implement? Briefly explain
me: dumbfounded
Interviewer; OK, let's change the question. Do you know the thread, a brief introduction
me: barabara
Interviewer: An introduction to high concurrency transaction levels and isolation
me: dumbfounded
Interviewer: Okay, let's go in another direction, what are the interface implementations of the collection CO...
me: barabara
Interviewer: The underlying implementation principle of HashMap
me: dumbfounded
Well, in the end, the interviewer also comforted me a little. The main purpose of writing this is to remind myself that it is time to study.
Eh~~ I also learn things like frameworks every day, I always feel that my basic knowledge is very solid
It's time to review the basics. Next, I will review from the aspects of io, collection, and thread. I will also record my review well. Writing this can also motivate myself.
Some time ago, a learning exchange group was added. The big guys in the group shared a set of "JAVA Core Knowledge Points Manual". This manual is currently version V1.0, and the content has the following 17 sections.
Java Fundamentals, Java Collections, Exception & Reflection, IO & NIO, Multithreading, JVM, Linux, MySql, Spring, Spring Cloud, Mybatis, Nginx, Redis, Dubbo, Kafka, SpringBoot, Resume.
I read it briefly, and the harvest is quite big, and I will share it with you today.
The following is a screenshot of the content. If you need to learn, there is a download method at the end of the article.
Introduction
1. Java knowledge part
1.JVM：
JVM is the only way for junior Java programmers to grow up. Before learning JVM, you only need to know that the code is compiled into Class, and the virtual machine loads the Class to run. After learning JVM, you can deeply understand the process of code compilation to loading. , the creation and garbage collection of objects in memory, and the rapid positioning of performance problems in daily development. Of course, it is also an indispensable bonus item for the interview.
2. Java Collections:
3. Multi-threaded concurrency:
4.java foundation
5. Spring principle
Second, the database part
3. Distributed high concurrency architecture part
This part is about distributed architecture knowledge, including Redis, Zookeeper, database performance optimization, load balancing, and more!
5. Knowledge of Microservices
Recently, there are many small partners who have interviewed. I hope to help more people pass the interview with Dachang smoothly. If you find it useful, please leave me a comment, like and forward it for three consecutive times~~
If you need to click the card below, you can get it for free