2. JVM and Machine Independency
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3. • JVM is the acronym for java virtual machine
• JVM is a platform-independent execution environment that converts Java
byte code into machine language and executes it
• Byte codes are machine code instructions for JVM
• Most programming languages compile source code directly into machine
code that is designed to run on a
specific microprocessor architecture or operating system

4. • JVM interprets compiled java binary code for a computers processor
• “Write once, run everywhere.”
• The Specification specifies an
1. instruction set,
2. a set of registers,
3. a stack,
4. a "garbage heap," and
5. a memory area
• Code for JVM contains in .class files.

6. • The main advantage of this system is the increased compatibility
• relative security of Java programs as a result of the Java Virtual Machine.
• JVM consist of following components:-
1)Byte-code verifier :- It verify the byte-code ,it check's for unusual code.
2)Class Loader :- After verifying Class Loader will load the byte-code into
the memory for execution.
3)Execution engine :-
It further consist of 2 parts :-
a)Interpreter :- It interpret the code & run.
b)JIT(Just-in-Time Compiler)

7. • 4)Garbage Collector:- It periodically check for the object on heap , whose
link is broken
So it can collect the garbage from Heap.
5) Security Manager :- It constantly monitors the code. It is 2nd level of
security.[1st level is Byte-code verifier ].

8. Thank you..

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