Chandrika: Created page with ''''Title of the script: '''Creating classes '''Author:''' arya Keywords: video tutorial, class in real world, class in java {| style="border-spacing:0;" | style="border:0.018…'

2012-11-27T10:13:35Z

Created page with ''''Title of the script: '''Creating classes '''Author:''' arya Keywords: video tutorial, class in real world, class in java {| style="border-spacing:0;" | style="border:0.018…'

New page

'''Title of the script: '''Creating classes

'''Author:''' arya

Keywords: video tutorial, class in real world, class in java

{| style="border-spacing:0;"
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Visual Cue'''
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Narration'''

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 1
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Welcome to the spoken tutorial on '''Creating Classes'''

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 2

Learning Objectives
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In this tutorial, we will learn about

* A '''class '''in real world
* A '''class '''in Java
* Structure of a''' Java class'''
* Syntax for a''' Java class'''
* A simple example of '''Java class'''

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 3

System Requirements
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Here we are using

* Ubuntu version 11.10
* JDK 1.6
* Eclipse 3.7.0<br/>

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 4

Prerequisite
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To follow this tutorial you must know how to write, compile and run a simple Java program in Eclipse.

If not, please see the spoken-tutorial on these topics available at '''spoken-tutorial.org'''.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 5

A class in real world
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us see what is a '''class '''in real world.

Whatever we can see in this world are all objects.

All the objects can be categorized into special groups.

Each group is termed as a class.

For example human being is a class.

We are all different objects of this class.

We all have different properties like eyes, legs, hands etc.

These are common to the human being class.

Seeing, eating, walking etc are behaviors that are common to the human being class.

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 6

A class in Java

| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A''' class '''is the blueprint from which individual objects are created.

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 7

Structure of a Java Class
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A class defines:

A set of properties called''' variables '''

A set of behaviors called''' methods.'''

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 8
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now, let us see the syntax for declaring classes

'''modifier – class -classname''' within brackets '''variable, constructor''' and''' method '''declarations.

We will learn about these in detail in the coming tutorials.

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Switch to '''eclipse'''

Click on '''File>> New>> Java Project'''
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us now create a simple''' class '''using '''Eclipse'''.

I have already opened''' Eclipse'''.

Now let us create a '''Project.'''

So click on '''File,''' go to '''New '''and click on''' Java Project.'''

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Point to '''New Project Wizard'''

Type '''ClassDemo'''.

Click '''Finish'''.
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the '''New Project Wizard''', enter the '''Project name '''as '''ClassDemo''' with C and D in capital.

Then click on '''Finish'''.

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Point to the''' Project ClassDemo'''.
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We see that the '''Project ClassDemo''' is created.

|-
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| So, right click on ClassDemo.

Go to '''New-> Class'''

Type Name as '''Student'''

Select '''public static void main.'''

Click''' Finish.'''
| style="border:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We will now create a''' Java class Student'''.

So right click on''' ClassDemo''', go to''' New''' and click on '''Class'''.

In the '''New Java Class wizard''' type the '''Name''' as '''Student.'''

We can see that the '''modifier''' here is''' public'''.

This shows that the class is visible to all the classes everywhere.

If a class has no '''modifier''' which is the '''default''' , it is visible only within its own '''package.'''

We will learn about '''packages''' in the later tutorials.

Now, here I have selected''' public.'''

In the method stubs select '''public static void main.'''

Then click on '''Finish'''.

We can see that class named '''Student '''is created.

Now, let me remove the comments.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| public class Student {

int roll_no;

String name;

void studentDetail() {

System.out.println(“The roll number is” + roll_no);

System.out.println(“The name is” + name);

}

<nowiki>public static void main(String[] args) </nowiki>{

System.out.println(“We have created a class with 2 variables and 1 method”);

}

}
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A '''Student class''' can contain properties like Name, Roll Number, Marks etc.

So inside this''' class Student''' let me declare two '''variables''' '''Roll Number''' and '''Name'''.

So, I will type''' int roll''' ''underscore'' '''number''' ''semicolon''.

Then '''String name '''''semicolon.''

So I have declared two '''variables.'''

Now a class also contains''' methods.'''

So let me create a method named '''StudentDetail.'''

This method will give the detail of each student.

So let me type void studentDetail opening and closing brackets, curly brackets open.

Now, this method will give the name and roll number of the Student.

So, type '''System''' ''dot '''''out '''''dot'' '''println''' within brackets and double quotes '''The roll number is plus roll''' ''underscore'' '''number''' ''semicolon''.

Next line type '''System '''''dot'' '''out''' ''dot''' ''println''' within brackets and double quotes '''The name is''' ''plus'' '''name''' and'' semicolon'''''.'''

Now, inside the main method we will type '''System''' ''dot'' '''out '''''dot'' '''println''' within brackets and double quotes '''We have created a class with two variables and 1 method.'''

Now, '''save''' the file by pressing '''Control''' and '''S''' keys simultaneously.

'''Run '''the program by pressing '''Control '''and '''F11''' keys simultaneously.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight the output
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We get the output as :

'''We have created a class with 2 variables and 1 method '''

just as we had typed in the main method.

Thus we have successfully created a '''class'''.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 9

Summary
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| So, in this tutorial we learnt '''about a class '''in java and '''how to create a class in java'''.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 10
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| For self assessment create a '''class''' named '''Employee '''with '''variables emp''' ''underscore'' '''number''' and''' emp''''' underscore'' '''name''' .

Method '''printEmployee '''which displays the '''Employee''' information.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 11
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Watch the video available at [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial http://spoken-][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial tutorial.org/What_is_a_Spoken_Tutorial]

* It summarises the Spoken Tutorial project

* If you do not have good bandwidth, you can download and watch it

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 12
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The Spoken Tutorial Project Team

* Conducts workshops using spoken tutorials

* Gives certificates for those who pass an online test

* For more details, please write to contact@spoken-tutorial.org

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 13
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Spoken Tutorial Project is a part of the Talk to a Teacher project

* It is supported by the National Mission on Education through ICT, MHRD, Government of India
* More information on this Mission is available at
* [http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org/NMEICT-Intro]

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 14
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We come to the end of this tutorial.

Thanks for joining us.

This is Arya Ratish signing off.

Good bye and Jai Hind.

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|

|-
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:0.018cm solid #000000;border-left:0.018cm solid #000000;border-right:0.018cm solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|

|}

Java/C2/Creating-class/English - Revision history

Chandrika: Created page with ''''Title of the script: '''Creating classes '''Author:''' arya Keywords: video tutorial, class in real world, class in java {| style="border-spacing:0;" | style="border:0.018…'