This document provides information about the Java Virtual Machine (JVM). It defines the JVM as a software layer that allows Java bytecode to run on different platforms. It explains that the JVM converts Java bytecode into machine language that can be executed by the hardware. It also discusses the Java Runtime Environment (JRE) which provides an implementation of the JVM to run Java programs, and the Java Development Kit (JDK) which includes the JRE plus development tools. Just-in-time (JIT) compilation is also summarized as improving Java program performance by compiling bytecode sections with similar functionality together.

2. JVM
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4. JVM
Java
JAVA VIRTUAL MACHINE ?
JRE ?
JDK ?
JIT ?

5. INTRODUCTION TO JVM
JVM : JAVA VIRTUAL MACHINE
Virtual machine:
gives a program a simplified interface for
interacting with a variety of physical computers and
their operating systems.

6. JAVA VIRTUAL MACHINE
JVM is a software layer which resembles an
hardware platform.
JVM converts Java byte code into machine language
and executes it.
The byte code can be executed on any platform
where there exist JVM.

7. JVM‘s are available for many hardware and
software platforms.
JAVA::"write once, run anywhere”: use of the same byte
code for all JVM’s on all platforms.
JAVA is platform independent.
JVM is platform dependent
JAVA VIRTUAL MACHINE

9. JAVA PROGRAM AT COMPILE TIME AND EXECUTION
TIME

10. JRE
JRE-Java Runtime Environment.
JRE is an implementation of the Java Virtual Machine which
actually executes Java programs.
JRE includes the JVM, Core libraries and other additional
components to run applications written in Java.

11. JDK
JDK-Java Development Kit
JDK is a bundle of software that is used to develop Java
based applications.
Needs more disk space as it contains the JRE along with
various development tools.
JDK includes the JRE, set of API classes, Java compiler, and
additional files needed to write Java applets and applications.

12. JDK-JRE - JVM

13. JIT
JIT : Just In Time Compiler
JIT is a part of the JVM.
JIT compiler helps improve the performance of Java programs.
It compiles parts of the byte code that have similar functionality
at the same time.

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