1. The program counter is the line number indicator of the bytecode executed by the current thread. 2. The Java virtual machine stack thread is private and has the same life cycle as the thread. Used to store information such as local variable tables, operand stacks, dynamic linked lists, method exits, etc. Local variable table storage content: basic data types (boolean, byte, char, short, int, float, long, double) object reference (different from symbol reference, symbol reference is stored in the constant pool) returnAddress type (points to a bytecode instruction The address of long and double type data with a length of 64 bits occupies 2 local variable spaces (slots), and the rest occupies 1 slot. Two exceptions: StackOverflowError: The stack depth requested by the thread > the depth allowed by the virtual machine OutOfMemoryError: Unable to apply for enough memory during dynamic expansion 3. The native method stack (Native Method Stack) is similar to the virtual machine stack, the difference is the Native Method Stack service In the Native method, the virtual machine stack service
1. Java runtime data area for JVM learning
Introduction: Program counter Line number indicator of the bytecode executed by the current thread. 2. Java virtual machine stack is thread private and has the same life cycle as the thread. Used to store information such as local variable tables, operand stacks, dynamic linked lists, method exits, etc.
2. Detailed explanation of Java memory allocation and recycling mechanism (picture)
##Introduction: This article mainly talks about the allocation and recycling mechanism of Java memory, mainly including the Java runtime data area, object creation, garbage collection algorithm and recycling strategy. The reference book is "In-depth Understanding of Java Virtual Machine" by teacher Zhou Zhiming. The author only summarizes and illustrates it based on the content in the book. This part of the content is almost all comprehensible. In order to facilitate understanding and memory, it is presented in the form of pictures, texts or tables as much as possible. 1. Runtime data area The following figure is a memory diagram of the Java virtual machine when it is running: From the figure we can see that the Java memory is divided into...
3. A detailed introduction to the memory runtime data area managed by the Java virtual machine
Introduction: This article mainly introduces For detailed information on the memory runtime data area managed by the Java virtual machine, friends in need can refer to the following
[Related Q&A recommendations]:
vba - python calls win32com.client to make a line chart in excel
The Java synchronization mechanism can be explained through the analogy of a building.
The above is the detailed content of Detailed introduction to data area. For more information, please follow other related articles on the PHP Chinese website!

Javadevelopmentisnotentirelyplatform-independentduetoseveralfactors.1)JVMvariationsaffectperformanceandbehavioracrossdifferentOS.2)NativelibrariesviaJNIintroduceplatform-specificissues.3)Filepathsandsystempropertiesdifferbetweenplatforms.4)GUIapplica

Java code will have performance differences when running on different platforms. 1) The implementation and optimization strategies of JVM are different, such as OracleJDK and OpenJDK. 2) The characteristics of the operating system, such as memory management and thread scheduling, will also affect performance. 3) Performance can be improved by selecting the appropriate JVM, adjusting JVM parameters and code optimization.

Java'splatformindependencehaslimitationsincludingperformanceoverhead,versioncompatibilityissues,challengeswithnativelibraryintegration,platform-specificfeatures,andJVMinstallation/maintenance.Thesefactorscomplicatethe"writeonce,runanywhere"

Platformindependenceallowsprogramstorunonanyplatformwithoutmodification,whilecross-platformdevelopmentrequiressomeplatform-specificadjustments.Platformindependence,exemplifiedbyJava,enablesuniversalexecutionbutmaycompromiseperformance.Cross-platformd

JITcompilationinJavaenhancesperformancewhilemaintainingplatformindependence.1)Itdynamicallytranslatesbytecodeintonativemachinecodeatruntime,optimizingfrequentlyusedcode.2)TheJVMremainsplatform-independent,allowingthesameJavaapplicationtorunondifferen

Javaispopularforcross-platformdesktopapplicationsduetoits"WriteOnce,RunAnywhere"philosophy.1)ItusesbytecodethatrunsonanyJVM-equippedplatform.2)LibrarieslikeSwingandJavaFXhelpcreatenative-lookingUIs.3)Itsextensivestandardlibrarysupportscompr

Reasons for writing platform-specific code in Java include access to specific operating system features, interacting with specific hardware, and optimizing performance. 1) Use JNA or JNI to access the Windows registry; 2) Interact with Linux-specific hardware drivers through JNI; 3) Use Metal to optimize gaming performance on macOS through JNI. Nevertheless, writing platform-specific code can affect the portability of the code, increase complexity, and potentially pose performance overhead and security risks.

Java will further enhance platform independence through cloud-native applications, multi-platform deployment and cross-language interoperability. 1) Cloud native applications will use GraalVM and Quarkus to increase startup speed. 2) Java will be extended to embedded devices, mobile devices and quantum computers. 3) Through GraalVM, Java will seamlessly integrate with languages such as Python and JavaScript to enhance cross-language interoperability.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 English version
Recommended: Win version, supports code prompts!
