Ali architecture strong share: write high-quality code to improve the Java program 151 suggestions!


I collated Java advanced materials for free, including Java, redis, mongodb, mysql, zookeeper, spring cloud, Dubbo high concurrency distributed and other tutorials, a total of 30g, which needs to be collected by myself.


Have you ever looked at the source code all night to provide a “one line” solution? Now you don’t have to. Have you ever thought and read a group of books in order to understand an algorithm? Now you don’t have to. Have you ever rigorously tested and compared n implementations to improve 0.1 second performance? Now you don’t have to. Have you ever looked for experts to solve the problem of multi thread deadlock? Now you don’t have to In the process of learning and using Java, do you spend a lot of time and energy on problems that could be mastered or solved quickly? Maybe you don’t need it now. Many of the contents of this book are paid by me. I hope it can help you avoid detours!
How long have so-called architects, designers, project managers and analysts not written code? Code is the cornerstone of everything. I don’t trust architects who haven’t written “Hello world”. When Dennis M. Ritchie decided to create a “look good” language, if he just stood on the high ground and shouted, the language is epoch-making. How excellent is it, but what’s the use if it’s not implemented? Without Dennis M. Ritchie’s personal coding implementation, C language cannot be born and UNIX operating system cannot be born. Before Linux gathered thousands of open source enthusiasts to develop and expand it, if there is no Linus coding implementation, it is only because of his shouting “I want to create an epoch-making operating system”. Is it useful? Everything is based on the premise of coding implementation, and code is the cornerstone of our progress.
This is an era of heroes, each of us wants to be worshipped, but it needs capital and strength, and our strength reflects our ability to deal with technical problems:
Can you write simple, clear and efficient code? ——Show it!
Can you build a stable, robust and fast system? ——Do it!
Can you answer a question that bothers many people? ——Answer it!
Can you fix a system bug? ——Fix it! Are you familiar with an open source product? ——Broadcast it!
Can you improve system performance? ——Tune it! ……
However, “if you want to be good at something, you must first make use of your tools”. Before “doing good at something”, first see whether our “tools” have been sharpened enough, and whether they can cut through thorns on our way forward. Whether your future career direction is architect, designer, analyst, manager, or other positions, as long as you still deal with software, you need to lay a good technical foundation. This book has condensed the core Java programming technology. If you can fully understand and put it into practice, your foundation will be more solid.

Features of this book

Deep. This book is not a grammar book. It will not teach you how to write java code, but it will tell you why StringBuilder is more efficient than string class, how to realize the self increment of HashMap, and why parallel computing generally starts from executors Not only how, but also why.
Wide. It covers a wide range, from coding rules to programming ideas, from basic syntax to system framework, from JDK API to open source products, all of which are involved, and all of the suggestions are not on paper, and are combined with the real scene.
Point. Explain a knowledge point, not a knowledge area, such as multithreading. There is no multithreading solution here, but how to stop a thread safely, how to set multithreading level, when to use lock, when to use synchronize, etc.
Essence. One suggestion is to explain and explain a problem and put forward relevant solutions, not to drag the water, but to explain only one knowledge point.
Chang. This book continues my consistent style of writing, flowing with the clouds and flowing with the flowing water. Every time I think about a theme, I will first write a belly draft to think about how to speak more smoothly. This book is not a very boring book, I always want to write it vividly and elegantly, but code is code, which can’t be deep processed in many times, the most direct is the most concise. This is a proposal. Think about it. When you write code, there is such a book at your hand that tells you how to write elegant and efficient code. What a pleasant thing!

Readers of this book

Find the coder for the “one line” solution. Programmers who want to improve their coding ability. People with lofty ideals are expected to be able to support their swords in the open source world. People who are crazy about coding.

How to read this book

First of all, this book is not for junior Java programmers. Before reading this book, you should have a preliminary understanding of the basic Java syntax at least. You’d better have participated in several projects and written some code. With these conditions, reading this book will have a greater harvest and will feel a kind of enjoyment. The chapters and suggestions in this book are relatively independent, so you can start with any suggestions in any chapter. It is strongly recommended that you place it at your desk and turn it around when you encounter problems. This book comes with a large number of source code (see for download address). It is recommended that you copy the sample code in the book when reading this book and put it in your favorites for use when necessary.


Chapter 1 General methods and guidelines in java development


Chapter 2 basic types


Chapter 3 class, object and method


Chapter 4 string


Chapter 5 arrays and sets


Chapter 6 enumeration and notes


Chapter 7 generics and reflection


Chapter 8 exceptions


Chapter 9 multithreading and concurrency


Chapter 10 performance and efficiency


Chapter 11 open source world


Chapter 12 thought as the source


Part content






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