Difference between revisions of "Java/C2/Creating-class/English-timed"
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Revision as of 14:41, 9 July 2014
| Time | Narration |
| 00:02 | Welcome to the spoken tutorial on Creating Classes |
| 00:05 | In this tutorial, we will learn about |
| 00:08 | A class in real world |
| 00:10 | A class in Java |
| 00:12 | Structure of a Java class |
| 00:14 | Syntax for a Java class |
| 00:16 | And A simple example of Java class
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| 00:19 | Here we are using
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| 00:30 | To follow this tutorial you must know how to write, compile and run a simple Java program in Eclipse.
|
| 00:37 | If not, please see the spoken-tutorial on these topics available at spoken-tutorial.org. |
| 00:46 | Now let us see what is a class in real world.
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| 00:50 | Whatever we can see in this world are all objects.
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| 00:54 | And All the objects can be categorized into special groups.
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| 00:59 | Each group is termed as a class.
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| 01:02 | For example human being is a class.
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| 01:05 | We are all different objects of this class.
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| 01:08 | We all have different properties like eyes, legs, hands etc.
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| 01:13 | Which are common to the human being class.
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| 01:15 | Seeing, eating, walking etc are behaviors that are common to the human being class. |
| 01:22 | Now let us see what is the class in Java?
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| 01:26 | A class is the blueprint from which individual objects are created. |
| 01:31 | Structure of a Java Class ; A class defines:
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| 01:35 | A set of properties called variables
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| 01:37 | And A set of behaviors called methods. |
| 01:40 | Now, let us see the syntax for declaring classes
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| 01:44 | modifier – class -classname within curly brackets variable, constructor and method declarations.
|
| 01:52 | We will learn about these in detail in the coming tutorials. |
| 01:58 | Now let us create a simple class using Eclipse.
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| 02:03 | I have already opened Eclipse.
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| 02:09 | Now let us create a Project.
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| 02:11 | So click on File, go to New and click on Java Project.
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| 02:20 | In the New Project Wizard, enter the Project name as ClassDemo with C and D in capital.
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| 02:34 | Then click on Finish.
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| 02:38 | We see that the Project ClassDemo is created. |
| 02:43 | We will now create a Java class name Student.
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| 02:47 | So right click on ClassDemo, go to New and click on Class.
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| 02:56 | In the New Java Class wizard type the Name as Student.
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| 03:03 | We can see that the modifier here is public.
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| 03:07 | This shows that the class is visible to all the classes everywhere.
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| 03:11 | If a class has no modifier which is the default , it is visible only within its own package. |
| 03:18 | We will learn about packages in the later tutorials.
|
| 03:23 | Here I have selected public.
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| 03:26 | In the method stubs select public static void main.
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| 03:31 | Then click on Finish.
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| 03:36 | We can see that the class named Student is created.
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| 03:40 | Now, let me remove the comments.
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| 03:51 | A Student class can contain properties like Name, Roll Number, Marks etc.
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| 03:57 | So inside this class Student let me declare two variables Roll Number and Name.
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| 04:04 | So, I will type int roll underscore number semicolon.
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| 04:14 | String name semicolon.
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| 04:19 | So I have declared two variables.
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| 04:22 | Now a class also contains methods.
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| 04:25 | So let me create a method named StudentDetail.
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| 04:30 | This method will give the detail of each student.
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| 04:34 | So let me type,' void studentDetail then opening and closing brackets, curly brackets open.
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| 04:49 | Now, this method will give the roll number and name of the Student.
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| 04:53 | 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.
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| 05:23 | Next line type System dot out dot println within brackets and double quotes The name is plus name and semicolon.
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| 05:40 | 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. |
| 06:10 | Thus We have created the class student. |
| 06:20 | Now let me, save the file by pressing Control and S keys simultaneously.
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| 06:26 | Let meRun the program by pressing Control and F11 keys simultaneously.
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| 06:33 | We get the output as :
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| 06:34 | We have created a class with 2 variables and 1 method
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| 06:38 | just as we had typed in the main method.
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| 06:46 | Thus we have successfully created a class. |
| 06:50 | So, in this tutorial we learnt about a class in java and how to create a class in java. |
| 06:59 | For self assessment create a class named Employee with variables emp underscore number and emp underscore name . |
| 07:10 | And Method printEmployee which displays the Employee information. |
| 07:16 | To know more about the spoken-tutorial project.
|
| 07:19 | Watch the video available at http://spoken-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 |
| 07:32 | Conducts workshops using spoken tutorials |
| 07:35 | Gives certificates to those who pass an online test |
| 07:38 | * For more details, please write to contact@spoken-tutorial.org
|
| 07:44 | Spoken Tutorial Project is a part of the Talk to a Teacher project |
| 07:48 | It is supported by the National Mission on Education through ICT, MHRD, Government of India |
| 07:55 | More information on this Mission is available at
|
| 08:04 | Thus We come to the end of this tutorial.
|
| 08:07 | This is Arya Ratish from IIT Bomaby signing off. Thanks for joining us. |
