Male witches

Male witches
Have you seen witches,yes in
Indian villages,worn out clothing
Haggard looking emaciated woman
Hankering after relation and love

Every body showers abuses
Calls words lest she steals
Beautiful child with her allurement
And will suck out blood till death

One day village witch seen
To allure a child with her
Toothless smile hankering
For motherly association
Catastrophe befallen all
Villagers hack led her to last breadth
Next day when children saw her
Dropped tears silently

Macabre horrific hopscotch
Games with minors
Suave sophisticated Pandher with
Accomplice Kolhi allures victims
To their mason to play murderous
Hopscotch games till breathless
And numb with cannibalistic fury
Silent moans renting the metro city

Bizzare silence of arid plane
Resound with macabre frenzy and furry
No whimper of Neha and Liza
Silent for ever,without remorse or guilt
Urban witches dance in the
Crridor of 21st century

CHAPTER II Applets

CHAPTER -II-Applets

As mentioned earlier,java is used to create two types programs.
* Stand alone Applications
* Applets
The most important use of Java is executable component can be distributed across Internet.Applet comes under this ctegory.Applets can be downloaded from any remote web sites and can be interpreted by the browser in your programs .Main uses of Applets are

1. Display Graphics


2. Accept user inputs to java applications.


3. Creating Animation


4. Playing interactive games.

Different from applicaion.

1. No main() function to invoke execution.Applet when loaded,automatically cal methods of

   Applet classto start and execute applet codes

2. Can not run independently.It runs only from inside web page
3. Can not read from or writeinto files in to files in localdisk
4. Can not communicate with other servsers except from hich it is down loaded
6. Can notrun any program from li>

Two Types of Java Programs:

All java programs can be catagorised in to two types:

1. Java Application
2. Java Applets

1st Application Program:I hope you have installed Sun Micro Ststem's JDK 1.6 version in your System.If not please down load it from Sun Microsystems and install it in your computer.It is free down load, Using JDK's editor or any other text editor create a java source file and save it say Hello_World.java .Rembeber Hello_World is the name of class file, where main() function is included.Then compile your source file with javac Hello_World.java .

If no syntax error,after compilation you will get Hello_World.class byte-codode file.This byte code file can run on any computer system equipped to handle Java programs simply typing java Hello_World at dos prompt.Now you see the result in your terminal.Let me write the program.

class Hello_World{

public static void main(String args[]){

System.out.println("To my viewers,HelloWorld!");

}

}

Being the first program, like explaing Gita Sloka,let me explain meanig of each important key word.

The first statement, class Hello_World ,the name of the class is defined as Hello_World.Since java is fully object oriented every part of program has to be included in a class file.You have to name the file as Hello_World.java.You canot save the file in any other name.This file contains only one method main().In the statement, public static void main(String args[]){-----}

main()is declared as publc static and void return type.

public keyword means this method is available to all classes in the program.

static key word declares that this method remains samefor all instances of the class.

void key word states that main() method does not return any value.main() method is taking a single parameter,String args[ ],mens it can take array of String objects as command line arguements.Further main() method contains a single statement

System.out.println("To my viewers,HelloWorld!");

The out object is a member variable of the System object which represents standard output stream which invokes println() funtion

Now cmplile the source program typing,

javac Hello_World.java

After compilation you will get executable class file as Hello_wrld.class file as Hello_World.class

file.now class file wil be inter preted by the command

java Hello_Wrld

You will now get the ouput in your monitor as

To my viewers,HelloWorld!

Any program has basically two two sections ie.

1. Code section
2. Data section.
3. Codes operate on the data and provides result to the user.Data can be provided to the program broadly in four ways.

1. Through the program itself
2. Through command line arguements
3. Online through key board
4. Persistent data handling in files and backend data bases like Oracle

In the above example we have not manipulated any data.I have contemplated to present java in two parts

1. Part-I Core java (mainly client side programming)
2. Part-II Advanced Java (mainly Server side Programming)Following J2EE slide show pertains to part-II and canbe skipped by begineers.

J2 EEE SIDES

View more presentations from bputhal.

Java Introduction

JAVA CHARACTERSITICS
Sun Micro Systems introduced java in 1995 and its cofounder Bill Joy described java as follows.
Java is just a small,simple,safe,object-oriented,interpreted,byte-coded,architecture,neutral.garbage-collected,multithreaded and strongly typed with exception-handling mechanism.
Let us understand Java characteristics little in detail:
Architecture neutral: Java file can run on any cpu architecture ie. It may be Intel ,Motorola or AMD.etc.
Platform –independent:java developed under any operating system can run on every operating system.One leading bank has replaced 80 million lines of plat- form specific banking applications with 20 million lines of java code.What a saving!
Object oriented fully:All program tokens have to be included in classes ,even main() function.In java programming,derived classes cannot have more than one super class ie.multiple in heritance is not supported.
Byte-coded:Java is compiled and interpreted language.Source code is first compiled similar to machine code but can be executed on any operating system wich has java interpreter.The interpreter reads the byt-ecode file and translates into machine language which can be directly executed by the local machine where java program is running.
Secured & Robust:Multilevel securities provided.
(1)Java pointers can be used to forge access to that part of program where access is not allowed and to access areas in memory that are supposed to be unalterable. So pointers are not supported in java.
(2)Byte code verifier: Before a java program is run,a verifier checks each byte code to make sure and assures that no viruses are there with a running applet.
Extensible: Java supports native methods written in another language,usually c++.
Multi-threaded: Java supports multiple path of execution in a program so that several tasks like rendering an image on the screen on one thread and accepting key board in put in the main thread can run simultaneously.
Exception handling mechanism:When any serious error is encountered,java creates an exception.This exception can be captured and managed by the program without system crashing.Java has its own garbage collection mechanism.User need not required to delete objects when they go out of their scope .So java is robust.
RMI supported:Java is suitable for distributed computing by providing tools for managing Remote Method Invocation .
Internet compatible: Java is net centric. Its networkability separates java from other languages.Many tell it is the language of Internet. Java applets helps to distribute executable components on Internet providing user interaction.
Flow chart for executing java programs

There are some features,whch Jav programming does not support but C++suppots:
1. Java does not support Pointers.
2. No implicit type casting.
3. No structures and unions.
4. No operator overloading .
5. No templates , header files.
6. Doesnot support multiple inheritance.

WHY SHALL WE READ JAVA?
C++ is well developed and most popular programming Language ,then why Java.
Important features of java.Some tips to remember
"AP OBSE MERI"
A:Architecture Neutral
P:Plat form independent
O:Object Oriented fully
B:Byte Code generated
S:Secured
E:Executed component is distributed across total net work
M:Multi Threaded
E:Extensible
R:Remote Method Invocation supported
I:Internet compatible