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Jps-java process StatusJPS is similar to the Linux PS command for viewing processes.JPS Name: Jps-java Virtual Machine Process Status Toolcommand usage: JPS [Options] [HostID]Options: Command option to control the output formatHostID: Specify a specific host, which can be an IP address and a domain name, or specify a s
1. View Vi/etc/udev/rules.d/70-persistent-net.rulesHere can see your network card information, find your corresponding network card nameFor example (this is the virtual machine where I add a new NIC that does not show its profile) # PCI Device 0x8086:0x100f (e1000)subsystem== "NET", action== "Add", drivers== "? *", attr{address}== "00:0c:29:52:5c:06", attr{type}== "1", kernel== "eth*" , name= "Eth0"# PCI D
Schematic diagram of Java Virtual Machine 1.4 field table set in the class file -- how the field is organized in the class file, graphic tutorial on Virtual Machine networking0. Preface
Understanding the principles of JVM virtual
Get a glimpse of the location of the Dalvik virtual machine in the Android system frame chart:Article directory: First, virtual machine briefIi. A brief description of the Java Virtual machineThree, Dalvik
1. Creation of Objects
1.1 class Load Check
When a virtual opportunity comes to a new command, it first checks whether the parameter of the instruction can navigate to a class's symbolic reference in a constant pool, and checks whether the class represented by the symbolic reference has been loaded, parsed, and initialized. If not, the corresponding class loading process is performed first. 1.2 Allocating memory
Divides a certain size of memory from
(Resource R1, Resource r2) {this.r1 = r1; THIS.R2 = R2; } @Override public void Run () {int j = 0; while (true) {synchronized (R2) {System.out.println ("the second thread got R2 ' s lock "+ j); Synchronized (R1) {System.out.println ("the second thread got R1 ' s lock" + j); }} j + +; } } }Open VISUALVM detected JVM process, we can see this tab is flashing, VISUALVM has detected my package under the deadlock class
Understanding of the Java Virtual machine stackThe virtual machine stack is the stack memory we know, and the stack memory is unique to the thread. The reference type stored in the local variable table in the stack memory is simply the memory address of the storage object. T
The class file binary character stream is loaded into memory (method area) through the ClassLoader and virtual machines. After the layout and initialization of the memory, the virtual machine bytecode execution engine can execute the functions defined by the relevant code implementation program. The object that the virtual
Structure of class fileThere are two structures in Java's class file: unsigned numbers and tables. The smallest storage unit is 8 bytes.Unsigned numbers are the basic data types used to describe numbers, UTF-8 encoded strings, and index references.Represents a complex data structure that consists of multiple unsigned numbers.which
Magic is the magic number, and the magic number takes up 4 bytes, what is the magic number to do? It actually means that the type of the file is a class file, no
C + + and other pure compilation language from the source to the final implementation of the general experience: compile, connect and run three stages, the connection is completed during the compilation, and Java during the compilation is only the Java Virtual machine can recognize the source code class file,
representing N to the Class D loader to load the class C. In the loading process, because there is no data verification, bytecode verification is required, it may trigger loading of other related classes, such as loading the parent class of this class or the implemented interface. Once any exception occurs during the loading process, the parsing process will fail.B. if C is an array type and the element type of the array is an object, that is, the N descriptor will be similar to "[Ljava. lang.
replicating data back and forth in the Java heap and the native heap. The detailed use of NiO can be found in the related articles on NIO in my Java Networking Programming series .ResourcesIn-depth understanding of the second edition of Java virtual machinesJava
1 Overview
The Virtual Machine loads the description class data from the class file to the virtual machine, verifies, converts, parses, and initializes the data, and finally forms the Java type that can be directly used by the virtual
Java Virtual Machine takes the following measures:
§ Check the catch clause table associated with the current method. Each catch clause contains its valid instruction range, exception types that can be processed, and the address of code blocks that can handle exceptions.
§ Catch clauses matching exceptions should comply with the following conditions: the exce
main a string array parameter to load the specified class, link other types used by the class, and initialize them. For example, for programs:
Class helloapp
{
Public static void main (string [] ARGs)
{
System. Out. println ("Hello world! ");
For (INT I = 0; I
{
System. Out. println (ARGs );
}
}
}
After compilation, type: Java helloapp run virtual machine in co
method call command, then, the invocation continues in the caller's execution environment.
Exception capture
An exception is called an error or exception in Java. It is a subclass of the throwable class. The cause in the program is: ① Dynamic Link error, if you cannot find the required class file. ② Runtime error, such as a reference to a null pointer. The program uses the throw statement.
When an exception occurs, the
Instant compilers within the hotspot virtual machineRecently in See Zhou Zhiming Teacher's "in-depth understanding of Java Virtual Machine" This book, after looking at a lot of harvest, so write a summary of reading it.Let's look at the following questions:
1. Why does the hotspot
description of each part of the VM. The following uses a specific example to analyze its running process.
The VM starts by calling the main method of a specified class and passes it to main a string array parameter to load the specified class, link other types used by the class, and initialize them. For example, for programs:
Class helloapp {After compilation, type: Java helloapp run virtual
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