Explain about JDK , JVM in Java

  jdk in java ,JRE and JVM

JRE:  Java Run time Environment ,It is used to provide run time environment. It is the implementation of JVM. It physically exists. It contains of set of libraries + other files.

JDK:  Java Development Kit it physically exists. It contains JRE+ development tools.

JVM :  Java virtual Machine it is a specification that provides run time environment.

JVM Performs the Loads code,Verifies Code,Executes Code.

Internal Architecutre of JVM

1. Class Loader: class loader loads the class files.
2. Class(Method) Area: This stores per class structures such as the run time constant pool field and method data the code for methods.
3. Heap:It is the run time data area in which objects are allocated.
4. Stack: Java Stack stores frames.It holds local variables and partial results.
5. Program Counter Register(PC):It contains the address of the Java Virtual Machine instruction currently being executed.
6. Native Method Stack:It contains the all the native methods.
7. Execution Engine:  It contains  Virtual Processor, Interpreter,Just In Time Compiler(JIT)

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