I will introduced the first session of J2SE

Sections

*SoftWare Language
*Interpreter VS Compiler
* Java as platform independent

SoftWare Language

the programming language divided into 5 Generation langauge related to appraoch of computer system & human related

1st GL: like bianry code (1,0)

2nd GL: like Assembly

3rd GL:high level language like Java,C#

4th GL: quary language like SQL

5th GL: Artificial language like prolog

*Interprter:(المترجم) like in some conferences each one of the audience has one like interpreter to interprete the words

in other words : the interpreter interprte each instruction (instruction by instruction)

Compiler : convert to machine laguage that the computer can inderstood it

C or Java ----->compiler --------> low level(machine language)

for whole the unit of the program

*what is the meaning of platform ?

platform:is combination of the H.W + S.W(Processor + O.S)

like X86 + windowsxp or

java is platform independent the meaning of this is not depend on the platform

the C is plat form dependent to introduce that

code C ---->compiler ------>file .exe -----> interprter

the java

------>windows+X86

code Java ---->compiler ---->Byte Code ---->JVM ------>solaris+SPARK

Byte Code: like machine code

JVM : java virtual machine (convert byte code to any platform)

so the java is platform independent beacuse of JVM

To talk about JVM we must introduce the knowledge about JDK , JRE

JDK:Java development kit

Consists of

1-JRE

2- compiler

JRE: Java runtime Enviroment

consists of

1-JVM

2-interpreter

API(Application Programming Interface)

it is library contains alot of classes & interfaces

like GUI(grafical user Interface)