java history, java Support System and java Envrionment(JDK and JRE)

Java History step by step

    Java is developed by sun microsystems of USA in  1991.

•Developed by James Gosling and team

•It is developed to manipulate consumer electronic devices (TVs, VCR, toaster etc) in 1990.

•In 1991 it is named as Oak

•In 1992 the team is named as green project team(touch-screen)

•In 1993 the team transformed the text based internet into graphical-rich environment

•1994 , the team developed a browser called hotjava

•1995 , oak was named as java

•1996, java is established as leader for internet programming as well as object oriented programming.

Java support system

Support system	Description
Internet connection	Local computer could be connected to the internet
Web server	A program that accepts requests for information and sends the required documents.
Web browser	A program that provides access to www and runs java applets.
HTML	A language for creating hypertext for the web
APPLET tag	For placing java applet in HTML document.
Java code	Complied java code that is referred to in the applet tag and transferred
Bytecode	To the user computer

Java Envrionment 

•JDK (Java Development Kit) contains development tools

•JRE (Java Runtime Environment) contains classes and methods  also known as JSL(Java Standard Library)  and API (application Programming Interface)

JDK (Java Development Kit)

Development tool	Description
Appletviewer	Enables us to run java applets
Java	Java interpreter, which runs java programs by reading and interpreting bytecode files
Javac	Java compiler, translates java source code into bytecode files
Javadoc	Creates HTML format documentation from java source code files
Javah	Produces header files for use with native methods
Javap	Java disassembler, enables us to convert bytecode file into a program description
jbd	Java debugger, which helps us to find errors in our programs