Blog: bugstack.cn
Precipitation, share, grow, let yourself and others can gain something! 😄
One, foreword
I expanded 💥, after reading most of the Java articles explained by interview, I found that many contents of the explanation are biased to translation, copy books, theory to answer the type of explanation, and finally make the knowledge in the fog.
Like when I ask you,
- Have you proven why HashCode uses 31 as a multiplier?
- What is the function of the perturbation function, and what other scenarios are it in use?
- What exactly are zipper addressing and open addressing, and how do you solve the collision problem?
- Did you know that ThreadLocal’s implementation also uses the golden ratio?
- CLH, MCS, are how to achieve fair lock, what is the code?
- Jvmti can be used for non-intrusive monitoring of thread pool state. Have you used it?
Is there any question that is difficult to answer even if you read the source code of the Java core API?
This is because Java code itself is based on the data structure and algorithm of the mathematical logic of the concrete implementation, and those mathematical knowledge hidden in the code if you do not know, then you will ignore it, so do not understand the source code.
The visual blind spot of knowledge, like driving at night. The lights aren't bright enough and you can only see 30% of the way. The faster you go, the more dangerous it is!
Therefore, this book is not a simple interview questions, is not inside the volume. Instead, it begins with a simple mathematical knowledge point related to programmers and goes into the core technology of Java. And each chapter is equipped with practical verification of the source code, can be compared with the feeling of masturbation together!
The book consists of 5 chapters, 29 sections, 417 pages, 115,000 words and took four months to complete. It covers data structures, algorithmic logic, concurrent programming, JVMS, as well as resumes and interviews with major Internet companies.
💋 In view of the author’s limited level, if the book contains difficult to understand the content, must be the author in the process of writing the lack of necessary description and strict calibration, thank you for your opinions or questions submitted to me, but also welcome to interact with me more, mutual progress and growth together.
Second, the introduction of
Hello, World of Java! Hello, Java world!
Welcome here. I’m glad you got the book. If you read every chapter of this book, it will not only help you in your job interview, but also give you a deeper understanding of Java core technologies.
The Java Manual is a PDF book that explains core Java technologies in an interview title and tries to prove to you that code is a concrete implementation of mathematical logic. Why do you say so? As you peruse the books, you’ll find a lot of math: disturbance functions, load factors, zipper addressing, open addressing, Fibonacci hashing, the use of the golden ratio, and more.
Coding is only in the determination of the design of the specific implementation, and the design part includes: data structure, algorithm logic and design mode, and this part of the data structure and algorithm logic in the Java core API reflected incisively and vividly. So, that’s why these are so popular interview questions, even though we might all feel like we’re building rockets.
So why would you want a 2.0 Turbo +9AT when the 🚕 car is running at 75 horsepower? Do you touch the guardrail on both sides of the bridge every time you walk? Then why are you afraid to cross a bridge without guardrail?
Most of the time, your additional capabilities are a reflection of your value. Don’t assume that your capabilities are just a business development CRUD every day. Sometimes it’s not the product that makes you write CRUD, it’s your ability to design CRUD only for the product’s functionality.
Data structures, algorithmic logic, and source code skills are all things that empower your business and are the foundation for writing better, more scalable applications, so it’s important to learn them well.
So, I highly recommend that you read this book in depth, and if it’s just a primer, so much the better, you can go deeper and absorb more and deeper content into your head.
1. Fit for the crowd
- Research and development personnel with programming background and 1-3 years working experience
- Want to read Java core source code, but the total feel do not understand
- Too much theory, but no practice
- Job interviews are riddled with questions
2. What can I learn
- How to write resume, how to face big factory, how to supplement deficiency
- Data structures and algorithmic logic used in the Java core API
- Mathematical knowledge required, disturbance functions, load factors, zipper addressing, open addressing, Fibonacci hashing, etc
- Learn the ability to learn, follow the author’s analysis and learning, enhance their own learning ability
3. Read advice
Although this book is source code analysis, theoretical practice, but will not let the reader feel boring. Author: Small fu Ge, in each of the knowledge has written the results of practical verification, for each chapter has the corresponding source code implementation. Small partners in reading can control the source code practice, and in the source code also includes some necessary materials (100 thousand word list verification perturbation function), tools, ICONS, etc., to let everyone personally experience the fun of knowledge. Also let all serious reading readers, after seeing can let understand is really understand!
4. Screenshots of books
Three, directories,
Chapter 1 talks about interviews
- Episode 1: What Interviewers ask me
- Section 2: Recognize your own technology stack blind spots
- Section 3: How to Write a Resume
- Section 4: What big companies like to talk about
Chapter 2 data structures and algorithms
- Section 1: Why does HashCode use 31 as a multiplier
- Section 2: HashMap Source Code Analysis (PART 1)
- Section 3: HashMap Source Analysis (Part 2)
- Section 4:2-3 Trees and Red-black Tree Learning (I)
- Section 5:2-3 Trees and Red-black Tree Learning (ii)
- Section 6: ArrayList in detail
- Section 7: LinkedList, ArrayList, insert analysis
- Section 8: Double-endian queue, delay queue, blocking queue
- Section 9: Java.util. Collections, Sorting, dichotomy, shuffling, rotation algorithms
- Section 10: StringBuilder vs. String
- Section 11: ThreadLocal source code analysis
Chapter 3 code farm lock
- Section 1: Volatile
- Section 2: Synchronized
- Section 3: ReentrantLock and Fair Locking
- Section 4: AQS principle analysis and practical application
- Section 5: AQS Shared locks, Semaphore, CountDownLatch
Chapter 4 Multithreading
- Section 1: How thread.start () starts
- Section 2: Thread, state transition, method use, principle analysis
- Section 3: ThreadPoolExecutor
- Section 4: Thread pools and JVMTI monitoring
Chapter 5 THE JVM virtual Machine
- Section 1: JDK, JRE, JVM
- Section 2: JVM class loading practices
- Section 3: JVM memory model
- Section 4: JVM troubleshooting tools
- Section 5: GC garbage collection
4. Download PDF📚
- Java Face Book Manual PDF complete edition of a book
- A complete version of the source code, a total of 27 cases
- Learning links: github.com/fuzhengwei/…
Five, 🎉 close
Early in July 19 to 20, is little Fu Ge do technology, the main state of confused, no fan base, no writing experience, there is no technical articles to precipitate, and, of course no operation skills, and a year later a circle seems to be breaking into the technology of the valve is finally on the fans’ tolerance, understanding and support, to grow up slowly. There is also a book relearning Java Design Pattern, which can be counted as 210,000 + downloads on the whole network. GitHub project has topped Trending for many times, becoming a global hot project. Also accumulated a nest of their own fans, thank you!
As for the Java Tutorial, this is not the end of the book, and I will continue to write manuals related to Spring, SpringBoot, Rpc, Mysql, and middleware. Similarly, the experience is not only the experience, but also the study and in-depth understanding of the core technology. All the output of the content is a purpose, so that more people can do knowledge, so that understand is really understand!
Wish you all have your own harvest and ability improvement in the learning process, wish you a happy New Year in advance, peace and good luck!