In 2020, JVM has become an indispensable part of Java programmers and a ladder for Java developers to move to a higher level.

We must not only be able to write code in Java as a system, but also know how to understand and analyze what happens inside a Java program after it runs, and then how to make it run better. Just like our old drivers who want to drive for many years, just knowing how to drive will definitely not be a good driver. If the car is driven more, there will always be more or less large and small malfunctions. Old drivers need to know what is wrong and what to do, otherwise it will cause frequent breakdowns and affect our itinerary.

However, although there are a lot of JVM-related materials on the market, it is obviously difficult for everyone to learn systematically. At the same time, JVM knowledge is also a compulsory subject for the first-line technical interview. Therefore, today I will share with you a note document that comprehensively sorts out the knowledge and experience of systematically learning JVM, including JVM technology and memory model, JVM parameters and built-in tools, GC algorithm, GC log, memory and threading and other related issues. And advanced advanced methods and actual combat, such as in-depth analysis of common interview questions, not only meet everyone's needs for rapid and systematic learning and comprehensive knowledge, but also take into account everyone's interview experience guidance.

No nonsense, first look at the general catalog and content

Due to space reasons, only the table of contents and screenshots of each chapter are shown here. If there is a need, this JVM complete document from entry to tuning fine notes can be obtained for free at the end of the article!

One, JVM concept