Difference between JDK,JRE and JVM

1. Brief summary of JVM
2. Java Runtime Environment (JRE)
3. Java Development Kit (JDK)

Understanding the difference between JDK, JRE and JVM is important in Java. We will have brief overview of JVM here. If you want to gain the detailed knowledge of JVM, move to the next page. Firstly, let's see the basic differences between the JDK, JRE and JVM.

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JVM

JVM (Java Virtual Machine) is an abstract machine.It is a specification that provides runtime environment in 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

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JRE

JRE is an acronym for Java Runtime Environment.It is used to provide runtime environment.It is the implementation 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.

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JDK

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