java virtual machine launcher

Original post address: http://www.roboticfan.com/blog/user_2005/104/20101218232353.shtml When the JVM (Java Virtual Machine) is started, an initial class loader hierarchy consisting of three class loaders is formed: Bootstrap classloader|Extension classloader|System classloader 1. bootstrap classloader-Bootstrap (also called the original) Class Loader. This load

I. Class File Content Note: Each Java class can only have one class file or interface. In the following discussion, U4 represents four bytes, while U2 represents two bytes. The content of the class file is as follows: Magic (magic number)-U4 (U4 indicates 4 bytes) 0 xcafebabe, which is used to easily identify Java class files and non-Java class files;

start from scratch and write your own Java Virtual machine Preface It's hard to write a Java virtual machine yourself. Hard. It's hard. It's not difficult.The answer is different, because the

Package Com.itm.path;public class testsystemproperty{public static void Main (string[] args) {System.out.println ("Ja VA runtime Environment version: \ n "+system.getproperty (" java.version ")); System.out.println ("Java Runtime Environment vendor: \ n" +system.getproperty ("Java.vendor")); System.out.println ("Url:\n of Java Vendor" +system.getproperty ("Java.vendor.url")); System.out.println

The following is a summary of the individual's understanding of the deep Java virtual machine Basic concepts: A Java Virtual machine can refer to an abstract specification, or to a specific implementation, or to a

8.1 dynamic connection and resolution The class file stores all its reference symbols in a constant pool. Each class file has a constant pool, and each class or interface loaded by the Java Virtual Machine has an internal version of the constant pool, called the runtime constant pool. The runtime constant pool is an implementation-specific data structure that is

Program Counter Program counter What do you do?With it, the bytecode interpreter can know which of the next bytecode instructions to execute.This program counter is required either to remove an instruction or branch, loop, jump, interrupt, or thread recovery.Where does the program counter exist?The virtual machine differs from the hardware, and the program counter of the composition principle is stored with

2.2 Run-time areaA Java Virtual machine is divided into several different data regions,1. Program counter, the bytecode interpreter is working by changing the value of the counter to take a scare jump. The bytecode command to execute Understanding the String.intern () methodFunction: If a string constant in the pool contains a string equal to this

First, loadThe load (Loading) stage is a phase of the class Loading process. During the load phase, the virtual machine needs to complete the following three things:A. Get a binary byte stream that defines this class by using the full restricted name of a class.B. Convert the static storage structure represented by this byte stream into the run-in data structure of the method area.C. Generate a Java.lang.Cl

"Deep Java Virtual machine" bis: Class file structurePlatform agnosticJava is a platform-independent language, thanks to the Java source code-compiled file that stores bytecode, the class file, and the implementation of the Java Virtual