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The Execution Engine will run the byte code that has been assigned to a memory area.

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Every new thread will have its own native method stack, same like stack and PC register. Native Method Area -This will store information about native methods, which are written in a language other than Java, such as C or C++. Once the instruction is completed, the PC register will be updated with the next instruction. Program Counter Register -Each thread will have its own PC Register, which will store the address of the currently executing instruction. When a frameвЂ™s method invocation is finished, it is destroyed. For each method call, a frame will be produced and pushed into the runtime stackвЂ™s storage. When threads start, the JVM creates a separate runtime stack in which method calls are stored.

Stack -In Java, stack memory is used for static memory allocation and thread execution. Heap -The heap area, which is created during virtual machine startup and from which memory is allocated for all class instances and arrays, represents the runtime data area. Method Area, Heap Area, Stack, Program Counter(PC) Registers, and Native Method Area are the five sub-areas of the JVM memory area.Д¬lass Area -Every classвЂ™s class level data is stored here, such as the runtime constant pool, field and method data, and method code. The memory area of the JVM is where data is stored. This is the final step in the Class Loading process, where all static variables are assigned their original values and static blocks are executed.

Resolve -All symbolic memory references are replaced with the original references from Method Area.

Prepare -For all static variables memory will be allocated and assigned with default values.

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Verify -Bytecode verifier will verify whether the generated bytecode is proper or not if verification fails we will get verification error.

A programmer can use the Class class object to get information about a classвЂ™s methods, variables, and constructors, among other things. This class type object is a predefined Class object in the java.lang package.

Details on the Modifier, Variables, and Method information, and so on.ДЄfter loading dot class file immediately JVM create an object for the loaded class on the heap memory of type.

Whether the вЂњ.classвЂќ file is a Class or Interface or Enum.

(If there are no parent class JVM decides loaded class as a parent class)

The immediate parent class of the loaded class.

The fully qualified name of the loaded class.

When JVM loads a class, it stores the following information in the method area. When we run a Java program, the class loader loads it first. The JVMвЂ™s Classloader subsystem is in responsible of loading class files (.class) into memory. BootStrap ClassLoader, Extension ClassLoader, Application ClassLoader are the three class loader which will help in achieving it. This component will load classes for you. It is responsible for the following three activities LetвЂ™s take a deeper look at each component.

Each java application runs inside its own java virtual machine.

If you start three java applications at the same time, on the same computer, you will get three java virtual machine instances running.

When the application completes, the instance terminates.

When a java application starts, a runtime instance of JVM is created.

JVM will also create a non-daemon (user threads) thread to execute the Java program. As a result, after the program is finished, the JVM instance is destroyed.

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If we install JRE on mac environment, it will deploy the code to create the JVM for mac environment.ДЄ Java Virtual Machine (JVM) instance will be built for each program. If we are installing JRE on a windows machine, it will deploy the code, which will require to create the JVM for windows environment. When you install JRE, it will deploy all the codes which can create a JVM. When you download JRE, JVM comes with it. The Java Virtual Machine (JVM) is a component of the Java Run Environment (JRE). It converts Java bytecode to machine code. The Java Virtual Machine (JVM) is a engine that offers a runtime environment for Java programs.

There is no hardware but it creates a platform or environment to run some kind of a language as input and convert it to different language or different output which someone else can understand. , PVM -Parrot Virtual Machine в†’ Create a environment for dynamic language. eg -JVM, CLR -Common Language Runtime в†’Helps.

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You may have the software or application which helps us to run other programs.

Application based VM (AVM) or Process based VM -In here It will allow you to run a single process as an application on a host machine.These environments are completely independent. System based VM (SVM) -This creates the environment for you to work for multiple users or multiple instances over that.