JVM Architecture in details | How JVM works internally By Naren

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In this session, I have explained the architecture of the Java Virtual Machine (JVM).
Whether you have used Java to develop programs or not, you must have heard about Java Virtual Machine (JVM) at some point or other.

JVM was initially designed to support only Java. However, over time, many other languages such as Scala, Kotlin, and Groovy, etc. were adopted on the Java platform. All of these languages are collectively known as JVM languages.

- Virtual Machine is a software simulation of a machine which can perform operations
similar to physical machine.
- Virtual Machine is not physically present.
- A virtual machine, usually known as a guest is created within another computing
environment referred as a "host." Multiple virtual machines can exist within a single
host at one time.

- For eg. Calculator software in operating system, which is not physically present, but
performs all the functions similar to physical calculator.

Java Virtual Machine (JVM) :

- It is a Runtime Engine responsible to run java based applications.
- It has two main tasks :
1. load .class file
2. execute .class file

- Main components of JVM :
1. Class Loader
2. Memory Areas
3. Execution Engine
=========================

Class Loader :

- It is responsible for the following three tasks :
1. Loading
2. Linking
3. Initialization
- Loading
- Linking :
In linking three activities are performed :
1. Verification
2. Preparation
3. Resolution
- Initialization

====================================

Memory Areas :

Total 5 types of memory areas :
1. Method Area
2. Heap Area
3. Stack Area
4. PC Register
5. Native Method Area

===========

Execution Engine :
It is responsible to execute java class file.

It contains mainly two components :
1. Interpreter
2. JIT Compiler

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