Advanced java training in bangalore

Working of
Java Virtual Machine
(JVM )
in Java ...

To write and execute a program
we need the following :
1) Editor – To type a program into, for example
notepad, notepad++ etc.
2) Compiler – To convert high level language
program into machine code Advanced Java
Training in Bangalore

3) Linker – To combine different program files
reference in your main program together.
4) Loader – To load the files from the secondary
storage device like Hard Disk, Flash Drive , CD into
RAM for execution. The loading is automatically
done when we execute our code.
5) Execution – Actual execution of the program
which is handled by OS(Operating System) &
processor.

Java code
compilation
and execution :

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[1] Once we write a program , we have to save with
the class name.java.
[2] Once we execute a program .java file converts
into .class file
[3] JVM convert the .class file into machine code.
[4] JVM divide the memory into stack and memory
memory.

[4] Then JVM call the class loader , class loader go
back to the main class and find the all stack
members and load into heap memory.
[5] Again control go back java course in bangalore
to the JVM , it loads the all static members
into stack.
[6] Then it try to identifies the main method and
start the execution.

[7] If main method is not there , then it will
through the error and execution will stop.
[8] Once execution done JVM call garbage
collector to clear the memory.

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What is JVM ?
JVM is known as Java Virtual
Machine.
It is the engine that executes the
Java Code.
It converts bytecode into machines
code. Java/j2ee classes bangalore

1) Java compiler produces code for a Virtual
Machine.
2) JVM compiled java code into bytecode. This
bytecode gets interpreted on machines
3) Between host system and Java Bytecode is an
intermediate language.
4) JVM is responsible for allocating a memory
space.

[1] Classloader:
Classloader www.aspendailynews.comis a
subsystem of JVM which is used to load the
class files into the memory.
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[2] Class Area(Method Area):
Class Area stores per-class structures such as
the runtime constant pool, fields and
methods, code for methods.

[3] Stack:
Java Stack stores frames.It holds local variables
and partial results, and plays a part in method
invocation and return.
[4] Native Method Stack:
Native Method Stack contains all the native
methods used in the application.
[5] Heap:
Heap is the runtime data area in which objects
are allocated and stored.

[6] Program Counter Register:
PC (program counter) register contains the address
of the Java virtual machine instruction currently
being executed.
[7] Execution Engine :
Execution Engine contains
i) A virtual processor
ii) Interpreter: Read bytecode stream then execute
the instructions.
iii) Just-In-Time(JIT) compiler: It is used to improve
the performance.

The JVM performs following
works : Advanced java training in
bangalore
1) Loads the java code
2) Verifies the code
3) Executes the code
4) Provides runtime environment

Java is both compiled
and interpreted
language :

Compiler :
A compiler is a program which converts a
program from one level of language to another.
Example conversion of C++ program into
machine code. java/j2ee classes bangalore
The java compiler convert high level java code
into bytecode .

Interpreter :
A interpreter is a program which converts a
program at one level to another programming
language at the same level.
In Java , the JVM converts the bytecode into
the native machine code

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