Programmer Think

A finishing touch It is not part of the virtual machine runtime data area, nor is it a memory area defined in the Java virtual machine specification. Direct memory is a memory interval that is outside the Java heap and directly applied to the system. It comes from NIO (introduced by JDK1.4) and operates the Native memory t ...

ThreadLocal principle Before reading this article, you need to understand the concept of strong, weak and virtual in Java. The transmission address is: Detailed explanation of four references of strong, weak and virtual in Java 1, Introduction It can solve the data security problem of multithreading and associate the current thread with a ...

1. What is a JVM? What does the java virtual machine include? JVM memory model? A: JVM:java virtual machine is a virtual computer implemented by hardware or software java virtual machine includes: stack, processor and register Program counter: the type indicator of bytecode executed by the current thread. It is used to record the address of ...

At the beginning of the article, let's ask a question. If OOM occurs in one thread of a java program, can other threads in the process still run? Next, do an experiment to see if the six kinds of JVM programs can be accessed after OOM. Here I use a springboot program. /** * @author : charon * @date : Created in 2021/5/17 8:30 * @descripti ...

1. Runtime data area 1. General In the process of executing Java programs, Java virtual machine will divide the memory it manages into several Different data areas. These areas have their own purposes and the time of creation and destruction, Some areas always exist with the start of the virtual machine process, while others are establish ...

Java has introduced four references since version 1.2, and the four references range from high to low: Strong Reference>Soft Reference>Weak Reference>Virtual Reference 1. Strong References (Never Recycle) If an object has a strong reference, the garbage collector will never recycle it. When there is insufficient memory space, th ...

During this period, I changed my job. Because I went to a foreign enterprise, my requirements for English suddenly increased. Now I live by Google translation every day. In meetings, I often encounter words I don't understand. I often need to write down the pronunciation, and then slowly find the corresponding words according to the context. My ...

introduction In the process of interviewing others, the JVM memory model almost needs to be asked, although some people say that these are the interview to build an aircraft carrier and screw up the work. If you want to be a CRUD coder, you can choose not to know this. In the question and answer of JVM memory model, some people can say that o ...

OpenJDK System. Analysis of loadlibrary source code System.loadLibrary is used to inform the JVM to load Native so. After so is loaded successfully, you can see that so has been loaded into memory in / proc/self/maps. Students familiar with system layer development can guess that this is basically equivalent to dlopen/LoadLibrary call. Next, l ...

In the book "in depth understanding of Java virtual machine: JVM advanced features and best practices (3rd Edition) (Huazhang original boutique) - Zhou Zhiming", in order to enhance understanding, follow the practice. Section 3.8.1 in the book: objects are assigned in Eden first. The experimental results are as follows: Then I got ...