CORE JAVA

Introduction:

*Java=C++  - Complexity + Web Applications*

1. Java language developed by SUN people,

                                   SUN: Stand For University Network

Q: What is language?

Ans:   Language is used for communication purpose

       Every language depending on 2 conditions

i.         Syntax     : it is concentrated on grammar.

ii.        Semantics: it is concentrated on meaning of the statement.

Types of Languages:

 Languages are basically divided into 3 types they are

i.         Symbolical Language: it is used for communication b/w animals.

ii.        Natural Language: it is used for communication b/w person to person.

              Eg: English , Telugu , Hindi etc.

iii.      Programming Language: it is used for communication b/w a programmer and system.

              Eg: C , C++ , JAVA , .NET etc.

Levels of Programming Languages:

S.No	Levels of P.L	Generations of P.L	Instruction format	Translator	Example
1	Low Level	1st  GEN	11000011		Binary Language
2	Mid level	2nd GEN	Mov AB	Assembly	Assembly Language
3	High Level	3rd GEN	Main() { }	1.complier 2.Interpreter	C C++ JAVA .NET
		4th GEN	Select * from emp	complier	Pl/sql,A.I
		5th

Note:  Language à Programming Language à Statements à Programs à Software

Statement: it is one type of instruction and instructing computer to perform a task.

Program: A group of Statements are called as PROGRAM.

Software: A group of related programs are called as SOFTWARE.

SOFTWARE CATEGORIES

Note:  Linker and Loader both are parts of COMPLIER.

Before conversion source code i.e called as PROGRAM .

After conversion of source code i.e called as APPLICATION .

Types of Application Software’s :

        Application software basically divided into two categories they are

i.          Standard alone applications

ii.        Web applications

Standard alone applications: all system level applications are called as standard alone applications, for example C, C++

Web applications: Any application executed inside a web browser such applications are called as “web applications”.

Differences b/w Standard alone and web applications:

Standard alone applications	Web applications
1.These applications do not wanted n/w	Web applications wanted network
2.Command prompt required. Ex: cmd or command	Web browser is required. Ex: IE opera Mozilla etc.
3.Creation, compliation, execution and output all these are performed on single machine.	Creation, compilation both are done at server side, execution and output performed on client side using web browser.
4.Minimum 1 system is required.	Minimum 2 systems are required.
5.Example : c, c++	Example : java, .net

Drawbacks of C++ :

1.   Most of the cases depending on pointers.

2.  Network, web,  Gui Applications are not easy to develop.

3.  Multithreading applications also very difficult to develop.

4.  Execution handling is not in a better style.

Note: To overcome all the above problems we need a special language i.e “JAVA”.

Differences b/w java and .net:

JAVA	.NET
1.java is platform independent .	1. .net is platform dependent.
2.java is open source.	2. .net is closed source.
3.java is suitable to any technology or any operating system.	3. .net is suitable to only windows operating system.

Note: Because of these problems .net is unable to cross the java so java is better or best language for development of internet applications.

Following figure shows web application, server side and client side technologies. 

TO DOWNLOAD THIS FILE CLICK HERE DOWNLOAD        

TO DOWNLOAD JVM ARCHITECTURE MATERAL CLICK HERE DOWNLOAD 

TO DOWNLOAD CONSTRUCTORS MATERAL CLICK HERE DOWNLOAD 

TO DOWNLOAD FINAL KEYWORD MATERAL CLICK HERE DOWNLOAD