Jvm

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Java virtual machine (JVM)

Muhammed Thanveer Melayishernoobi@gmail.comMuhammed Thanveer MMuhammed Thanveer MLinkedin Profile

Java Virtual Machine

• JVM (Java Virtual Machine) is an abstract machine.It is a specification that provides runtime environmentin which java bytecode can be executed.

• JVMs are available for many hardware and software platforms (i.e.JVM is plateform dependent).

The JVM performs four main tasks:

• Loads code• Verifies code• Executes code• Provides runtime

environment

Java Runtime Environment

• .It is used to provide runtime environment.It is theimplementation of JVM.It physically exists.It contains set of libraries + other files that JVM uses at runtime.Implementation of JVMs are also actively released by other companies besides Sun Micro Systems.

JDK

JDK is an acronym for Java Development Kit.It physically exists.It contains JRE + development tools.

Difference between JRE, JDK and JVM

• JRE and JDK come as installer while JVM are bundled with them.

• JRE only contain environment to execute java program but doesn’t contain other tool for compiling java program.

• JVM comes along with both JDK and JRE and created when you execute Java program by giving “java” command.

•

Read more: http://javarevisited.blogspot.com/2011/12/jre-jvm-jdk-jit-in-java-programming.html#ixzz3HVdFOV00

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