I compiled a free Java Advanced information, covering Java, Redis, MongoDB, MySQL, Zookeeper, Spring Cloud, Dubbo distributed high concurrency and other tutorials, a total of 30G, needs its own collection.
Portal: https://mp.weixin.qq.com/s/osB-BOl6W-ZLTSttTkqMPQ

introduction

Have you ever been to provide a "One Line" solutions and night to view the source code? Now you no. Have you ever in order to understand an algorithm and wrestling, reading books? Now you no. Have you ever 0.1 seconds in order to enhance performance and rigorous testing and comparison of the N kinds of implementation? Now you no. Have you ever multi-threaded deadlock in order to avoid problems anywhere to master common diagnosis and treatment? Now you no. ...... learn and use Java in the process you spent a lot of time and effort could have quickly grasp or solve the problem? Maybe you do not have now, a lot of this book is the price I have to pay in return, hope it helps you to avoid detours!
Those so-called architects, designers, project managers, analysts, how long have not written code? Code is the cornerstone of all, I do not trust even the "Hello World" are not written architect. When we look at the software industry ancestors bar, Dennis M.Ritchie decided to create a "look good" language, if only cry standing height, the language is a landmark, it is how good, but not to achieve, what is the use of it? No DennisM.Ritchie personally Coding, C language can not be born, UNIX operating system can not be born. Prior to gather tens of thousands of Linux open-source enthusiasts in its development and expansion, if there is no code to achieve Linus, he alone scream "I want to create operating system, an epoch-making" useful? Everything is coded to achieve as a precondition, the code is the cornerstone of our progress.
This is an age of heroes, every one of us wants to be worshiped, but it needs capital and strength, and our strength is reflected in our ability to deal with technical issues:
you can write simple, clear and efficient code? --Show it!
You can structure a stable, robust and efficient system? --Do it!
Can you answer a question many people are troubled by N? --Answer it!
You can repair a system Bug? --Fix it! You are very familiar for an open source product? --Broadcast it!
You can improve system performance? --Tune it! ......
However, "we must first of its profits", before the "good work", to see if our "control" has been sharpened enough, whether overcoming all obstacles in the way of our progress . Whether your future career direction are architects, designers, analysts, managers, or other positions, as long as you also deal with the software, you will be necessary to lay the technical foundation. The book of the core Java programming techniques are concise, if we can all understand and put into practice, you will be more solid foundation.

The book features

deep. This book is not a grammar book, it will not teach you how to write Java code, but it tells you why StringBuilder will be higher than the efficiency of the String class, HashMap how the increment is done, why are generally parallel computing from the Executors not only tells you started ...... How (how to do), but also tells you Why (why do).
wide. Covers a wide range, from the encoding rules to programming ideas from basic grammar to the framework, from JDK API to open source products, all are covered, but not all of the recommendations on paper, are combined with the real scene.
point. Explain a point of knowledge, rather than a range of knowledge, such as multi-threaded, multi-threaded here does not provide solutions, but to let you know how to safely stop a thread, how to set up multi-threaded checkpoints, when to use lock, when the with synchronize, and so on.
fine. Concise, destroy Huanglong, a suggestion is a question of interpretation and explanation, as well as propose related solutions, not dragging its feet, only to explain for a knowledge point.
smooth. After my book continues the consistent writing style, graceful, his right, every time you want a good theme, a plan will be a hit, think about how to speak more smoothly. This book is not a very boring book, I was trying to write it vivid and elegant, but the Code is the Code, does not allow a lot of time processing, which is the most direct and most concise. This is a proposal, think about it, when you write code, there is such a book in your hand, tell you how to write elegant and efficient code, it would be a how pleasant thing ah !

This book is for readers

Look for "One Line" (line) to solve the coder scheme. Programmers want to improve their own coding capabilities. In the open source world we can expect people with lofty ideals sword and rows. Encoding lovestruck man.

How to Read This Book

At the outset, this book is not for beginning Java programmers, to have a preliminary understanding of basic Java syntax, at least until reading this book, it is best worked on several projects, wrote some code, with these conditions, read this the book will have a greater harvest, you will feel is a pleasure. Various sections and various suggestions in this book are relatively independent, so you can start from any suggestion of any chapter to read. It is strongly recommended that you place it on your desk, thumb through when they encounter problems. The book comes with a large number of source code (see Download chapter website www.hzbook.com), I suggest that you copy the example code in the book at the time of reading this book, put it in your favorites, ready for use when needed.

Chapter 1 Java methods and guidelines for the development of generic