difference between JDK, JRE and JVM

What is  difference between JDK, JRE and JVM  

If you want to get the detailed knowledge of Java Virtural Machine, move to the next page. Firstly, let's see the basic differences between the JDK, JRE and JVM.

JVM(Java Virtual Machine)

JVM ( Java Virtual Machine) is known as virtual because jvm output is not machine dependent   which makes java as a platform independent. When we compile a java program then  output is in ‘.class’ file instead of .exe file . this class file is known as byte code. JVM is an enviourment in which java byte code is executed . JVM , JDK and Jre are not platform independent they are designed specifically for different operating system  but the byte code provided by every jvm is same which is platform indepent .

The JVM  is responsible for following tasks : Step 1 :It  Loads the code written by user. Step 2 : it Verifies the code before executing Step 3 : Executes code and generate byte code Step 4 : Provides a  runtime environment for byte code

JRE(Java RunTime Environment)

JRE is known as  Java Runtime Environment which provide enviourment for execution . jre  is the implementation of JVM. JRE contains set of libraries files which is used by JVM at runtime .

JDK (Java Development Kit)

Java Developer Kit is set of  tools which is required to develop the Java programs  and  JRE is required to  execute java  programs. Jdk contain java compile ,  Java application launcher and  Appletviewer, etc…

Java compiler convert the java code into byte code .

Jdk contain JVM +JRE and other tools .