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1. JVM
JRE
JAVAC
Are the main part
for the java program
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2. JVM
JVM is known as Java Virtual machine.It is an
interpreter .Java Virtual Machine is an abstract
machine.
It provides the runtime environment in which java
bytecode can be executed.
JVM is platform dependent so it is available for
many hardware and software.
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3. What is
JVM?
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4. [1] JVM is a specification where
working of Java Virtual Machine is
specified.
But implementation provider is
independent to choose the algorithm.
Its implementation has been provided
by Sun and other companies.
Specification

5. Implementation
[2] JVM is an implementation
Its implementation is called
as JRE (Java Runtime
Environment).
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6. Runtime Time Instance
[3] JVM is a Runtime Instance
Whenever we write java
command on the command
prompt to run the java class, an
instance of JVM is created.
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7. Working
of
JVM:
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8. The JVM performs following works :
1)Loads the java code
2)Verifies the code
3)Executes the code
4)Provides runtime environment

9. Architecture of JVM
1) Classloader:
It is a subsystem of JVM which is used to load the
class files.
2) Class Area(Method Area):
Class Area stores per-class structures such as the
runtime constant pool, field and method data, the
code for methods.
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10. [3] 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.
JIT compiles parts of the byte code that
have similar functionality at the same time,
and hence reduces the amount of time
needed for compilation.

11. JRE
Java
Runtime
environment

12. It is used to provide runtime environment to java
program.
It is the implementation of JVM. It physically exists.
It contains set of libraries and other files
that JVM uses at runtime.
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13. Javac
It is the primary Java compiler included in the
JDK(Java Development Key) .
Javac is itself written in java .The compiler can
also be invoked programmatically.
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14. The compiler accepts source code
conforming to the Java language
specification JLS) and generates bytecode
conforming to the
Java Virtual Machine Specification
(JVMS).

15. Working ofJavac
- The javac command compiles Javasource code (.java file)into Javabytecodes (.class file).we then use the Java interpreter tointerprete the Java bytecodes.
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16. - Java source code must be contained in files
whose filenames end with the .java extension.
The file name must be having the class name, as
classname.java, if the class is public or is
referenced from another source file.
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17. - For every class defined in each source file
compiled by javac compiler, the compiler stores
the resulting bytecodes in a class file with a
name of the form classname.class.
- When the compiler must refer to your own
classes you need to specify their location. Use
The classpath option or CLASSPATH
environment variable to do this.

18. - Class path is a sequence of directories (or zip
files) which javac searches for classes not
already defined in any of the files specified
directly as command arguments.
- The compiler looks in the class path for both a
source file and a class file, recompiling the
source (and regenerating the class file) if it is
newer.

19. This is the short description about
the JVM ,JRE and Javac .
To know more about the java for
developing purpose or getting a job
as java developer join Infocampus
Software Training Institute for the
java course.
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20. CONTACT DETAILS
#12, 1
st
& 4
th
Floor,
Outer Ring Road,
Kalamandir Road
Anand Nagar,
Marathahalli,
Bangalore,
Karnataka 560037

21. CONTACT INFOCAMPUS
@
9738001024
ENQUIRE AT:
http://www.infocampus.co.in/java-
training-bangalore.html

22. THANK
YOU