Difference between revisions of "Java/C2/Creating-class/English-timed"

|| ''Time'''

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| Welcome to the spoken tutorial on '''Creating Classes'''

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|   In this tutorial, we will learn about

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| A '''class '''in real world

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| A '''class '''in Java

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| Structure of a''' Java class'''  

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| Syntax for a''' Java class'''

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| And A simple example of '''Java class'''

 

 

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| Here we are using

 

* Ubuntu version 11.10  

* JDK 1.6 and

* Eclipse 3.7.0  

 

 

 

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| To follow this tutorial you must know how to write, compile and run a simple Java program in Eclipse.

 

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

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|And All the objects can be categorized into special groups.

 

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|Each group is termed as a class.

 

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|For example human being is a class.

 

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|We are all different objects of this class.

 

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| Which are common to the human being class.

 

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| 01:22   

|Now let us see what is the class in '''Java'''?

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| A''' class '''is the blueprint from which individual objects are created.

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|Structure of a '''Java Class''' ; A class defines:

 

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

 

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

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| Now, let us see the syntax for declaring classes

 

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

 

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

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|Now let us create a simple''' class '''using '''Eclipse'''.

 

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

 

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

 

 

 

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| In the '''New Project Wizard''', enter the '''Project name '''as '''ClassDemo''' with C and D in capital.

 

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| We see that the '''Project ClassDemo''' is created.

| We will now create a''' Java class ''' name '''Student'''.

 

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

 

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

 

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

 

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

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| Here I have selected''' public.'''

 

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

 

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

 

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

 

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

 

|  '''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''' then opening and closing brackets, curly brackets open.

 

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

 

|So, type '''System''' ''dot '''''out '''''dot'' '''println''' within brackets and double quotes '''The roll number  is ''' we can type it as number is ;  close the double quotes '''plus roll_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.'''

|Thus We have created  the class '''student'''.

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

 

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

 

 

 

|  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.

 

|   So, in this tutorial we learnt '''about a class '''in java and '''how to create a class in java'''.

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| For self assessment create a '''class''' named '''Employee '''with '''variables emp''' ''underscore'' '''number''' and''' emp''''' underscore'' '''name''' .

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

|  To know more about the spoken-tutorial project.

 

|  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]

| 07:22

| It summarises the Spoken Tutorial project  

| 07:25

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

 

 

| 07:30   

|   The Spoken Tutorial Project Team

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| Conducts workshops using spoken tutorials  

| 07:35

|Gives certificates to those who pass an online test  

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

 

 

| 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]

 

 

| Thus We come to the end of this tutorial.

 

|This is Arya Ratish from IIT Bomaby  signing off.  Thanks for joining us.