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Java jvm architecture

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Definition of JVM

JVM stands for Java Virtual Machine. It runs java bytecode generated by java compiler.

JVM Architecture Component:

Class Loader : Class loader loads the Class for execution.

Method area : Stores pre-class structure as constant pool..

Heap area : Heap is in which objects are allocated.

Stack : Local variables and partial results are store here. Each thread has a private JVM stack created when the thread is created.

Program register : Program register holds the address of JVM instruction currently being executed.

Native method stack : It contains all native used in application.

Executive Engine : Execution engine controls the execute of instructions contained in the methods of the classes.
Native Method Interface : Native method interface gives an interface between java code and native code during execution.
Native Method Libraries : Native Libraries consist of files required for the execution of native code.

Definition Of JRE

The Java Runtime Environment (JRE) provides the libraries, the Java Virtual Machine, and other components to run applets and applications written in the Java programming language. JRE does not contain tools and utilities such as compilers or debuggers for developing applets and applications.

Definition Of JDK

The JDK also called Java Development Kit is a superset of the JRE, and contains everything that is in the JRE, plus tools such as the compilers and debuggers necessary for developing applets and applications.

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