Introduction of java Lect-2

Introduction of java Lect-2

What is Java?

            Java is Pure Object  Oriented  platform Independent  (Architecture neutral) Language  developed by James Gosling from Sun Micro system(sun)in 1991. The first publicly available version of Java (Java 1.0) was released in 1995.

  

Note:-   Java technology is both a programming language and a platform. 

Note:-   Sun Microsystems was acquired by the Oracle Corporation in 2010

Note:-   Over time new enhanced versions of Java have been released.

Note:- The current version of Java is  Java 1.7 which is also known as Java 7

Note:- From the Java programming language the Java platform evolved.

Note:- The Java platform allows software developers to write program code in other languages than

         

             the Java programming language.

  History of Java Language

• In 1991 a group of Sun Microsystems engineers Led by James Gosling ,decided to develop a  Language for consumer device (Like- cable Box, Microwave ,Washing Machine etc)  
• They Wanted the language to be small because  these device don’t’ have powerful CPU.

• They also wanted the language to be hardware independent since different manufactures would use different CPU.

• The project was Name Green….

• They decided to compile the code to an intermediate machine like code for imaginary CPU called Virtual Machine (VM),actually there is a real CPU,that implement this virtual CPU

• This intermediate code called Byte Code

• Byte code Completely Hardware Independent