jdk jre jvm - JAVA

 jdk jre jvm

JDK:-

•        Java Development kit.

•       Jdk is a software development environment used to develop standalone and web applet applications.

•       It has physical existence and

The JDK contains a private Java Virtual Machine (JVM) and a few other resources such as an interpreter/loader (java), a compiler (javac), an archiver (jar), a documentation generator (Javadoc), etc. to complete the development of a Java Application.

Commands or tools of JDK

•       Javac : used to compile source and will generate a .class file( or simply byte code)of same name which you have used to save program file if program doesn’t have any error

•       Java : after have .class file(byte code) java command of jdk will interpret the .class file to machine understandable format and will produce an output that we have supposed to print.

•       Javah : header file

•       Applet viewer : used for executing applet program

Javadoc and manymore

JRE:-

•       Java Runtime Environment.

•       These are some set of software tolls used for developing java applications.

•       Used to provide runtime environment.

•       As per cloud it is PAAS

•       It is the implementation of JVM

•       It has physical existence.

JVM:-

•       JVM (Java Virtual Machine) is an abstract machine.

•        It is called a virtual machine because it doesn't physically exist.

•        It is a specification that provides a runtime environment in which Java bytecode can be executed.

•       It can also run those programs which are written in other languages and compiled to Java bytecode.

•       Loads code

•       Verifies code

•       Executes code

•       Provides runtime environment