Difference between revisions of "Java/C2/Creating-class/English-timed"
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|| '''Time''' | || '''Time''' | ||
|| '''Narration''' | || '''Narration''' | ||
| + | |||
|- | |- | ||
| − | | | + | |00:02 |
| − | | | + | |Welcome to the spoken tutorial on '''Creating classes'''. |
|- | |- | ||
| − | | 00:05 | + | |00:05 |
| − | | | + | | In this tutorial, we will learn about: |
|- | |- | ||
| − | | | + | |00:08 |
| A '''class''' in real world | | A '''class''' in real world | ||
| + | |||
|- | |- | ||
| − | | | + | |00:10 |
| A '''class''' in Java | | A '''class''' in Java | ||
| + | |||
|- | |- | ||
| − | | | + | |00:12 |
| − | | Structure of a '''Java class''' | + | |Structure of a '''Java class''' |
| + | |||
|- | |- | ||
| − | | | + | |00:14 |
|Syntax for a''' Java class''' | |Syntax for a''' Java class''' | ||
| + | |||
|- | |- | ||
| − | | | + | |00:16 |
| − | | And a simple example of '''Java class'''. | + | |And a simple example of '''Java class'''. |
| + | |||
|- | |- | ||
| − | | | + | | 00:19 |
| − | | Here we are using: | + | | Here we are using: '''Ubuntu version 11.10''', '''JDK 1.6''' and '''Eclipse 3.7.0''' |
| − | '''Ubuntu version 11.10''' | + | |
| − | '''JDK 1.6''' and | + | |
| − | '''Eclipse 3.7.0''' | + | |
|- | |- | ||
| − | | | + | | 00:30 |
| To follow this tutorial, you must know how to write, compile and '''run''' a simple Java program in '''Eclipse'''. | | 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'''. | |If not, please see the spoken-tutorial on these topics, available at '''spoken-tutorial.org'''. | ||
| Line 45: | Line 48: | ||
|- | |- | ||
| − | | | + | |00:50 |
|Whatever we can see in this world are all objects. | |Whatever we can see in this world are all objects. | ||
|- | |- | ||
| − | | | + | |00:54 |
|And all the objects can be categorized into special groups. | |And all the objects can be categorized into special groups. | ||
|- | |- | ||
| − | | | + | |00:59 |
|Each group is termed as a '''class'''. | |Each group is termed as a '''class'''. | ||
|- | |- | ||
| − | | | + | |01:02 |
|For example, human being is a '''class'''. | |For example, human being is a '''class'''. | ||
|- | |- | ||
| − | | | + | |01:05 |
|We are all different objects of this '''class'''. | |We are all different objects of this '''class'''. | ||
|- | |- | ||
| − | | | + | |01:08 |
|We all have different properties like eyes, legs, hands etc. | |We all have different properties like eyes, legs, hands etc. | ||
|- | |- | ||
| − | | | + | |01:13 |
| − | | which are common to the 'human being' class. | + | |which are common to the 'human being' class. |
|- | |- | ||
| − | | | + | |01:15 |
|Seeing, eating, walking etc are behaviors that are common to the human being class. | |Seeing, eating, walking etc are behaviors that are common to the human being class. | ||
|- | |- | ||
| − | | 01:22 | + | |01:22 |
|Now let us see what is the '''class''' in '''Java'''? | |Now let us see what is the '''class''' in '''Java'''? | ||
|- | |- | ||
| − | | | + | | 01:26 |
| A''' class '''is the blueprint from which individual objects are created. | | A''' class '''is the blueprint from which individual objects are created. | ||
|- | |- | ||
| − | | | + | | 01:31 |
| Structure of a '''Java Class'''; A '''class''' defines: | | Structure of a '''Java Class'''; A '''class''' defines: | ||
|- | |- | ||
| − | | | + | |01:35 |
| − | | | + | |A set of properties called '''variables '''. |
|- | |- | ||
| − | | | + | |01:37 |
| − | | | + | |And a set of behaviors called '''methods.''' |
|- | |- | ||
| − | | | + | |01:40 |
| − | | | + | |Now, let us see the syntax for declaring '''classes'''. |
|- | |- | ||
| − | | | + | |01:44 |
|'''modifier – class -classname''' within curly brackets '''variable, constructor''' and '''method''' declarations. | |'''modifier – class -classname''' within curly brackets '''variable, constructor''' and '''method''' declarations. | ||
|- | |- | ||
| − | | | + | |01:52 |
|We will learn about these in detail, in the coming tutorials. | |We will learn about these in detail, in the coming tutorials. | ||
|- | |- | ||
| − | | | + | |01:58 |
|Now, let us create a simple '''class ''' using '''Eclipse'''. | |Now, let us create a simple '''class ''' using '''Eclipse'''. | ||
|- | |- | ||
| − | | | + | |02:03 |
|I have already opened '''Eclipse'''. | |I have already opened '''Eclipse'''. | ||
|- | |- | ||
| − | | | + | |02:09 |
|Now let us create a '''Project.''' | |Now let us create a '''Project.''' | ||
|- | |- | ||
| − | | | + | |02:11 |
|So click on '''File,''' go to '''New ''' and click on '''Java Project.''' | |So click on '''File,''' go to '''New ''' and click on '''Java Project.''' | ||
|- | |- | ||
| − | | | + | |02:20 |
| In the '''New Project''' Wizard, enter the '''Project name ''' as '''ClassDemo''' with C and D in capital. | | In the '''New Project''' Wizard, enter the '''Project name ''' as '''ClassDemo''' with C and D in capital. | ||
|- | |- | ||
| − | | | + | |02:34 |
|Then click on '''Finish'''. | |Then click on '''Finish'''. | ||
|- | |- | ||
| − | | 02:38 | + | |02:38 |
| − | | We see that the '''Project ClassDemo''' is created. | + | |We see that the '''Project ClassDemo''' is created. |
|- | |- | ||
|02:43 | |02:43 | ||
| − | | We will now create a Java '''class''' named '''Student'''. | + | |We will now create a Java '''class''' named '''Student'''. |
|- | |- | ||
| − | | | + | |02:47 |
|So, right click on''' ClassDemo''', go to''' New''' and click on '''Class'''. | |So, right click on''' ClassDemo''', go to''' New''' and click on '''Class'''. | ||
|- | |- | ||
| − | | | + | |02:56 |
|In the '''New Java Class''' wizard, type the '''Name''' as '''Student.''' | |In the '''New Java Class''' wizard, type the '''Name''' as '''Student.''' | ||
|- | |- | ||
| − | | | + | |03:03 |
|We can see that the '''modifier''' here is''' public'''. | |We can see that the '''modifier''' here is''' public'''. | ||
|- | |- | ||
| − | | | + | |03:07 |
|This shows that the '''class''' is visible to all the classes everywhere. | |This shows that the '''class''' is visible to all the classes everywhere. | ||
|- | |- | ||
| − | | | + | |03:11 |
|If a '''class''' has no '''modifier''' which is the '''default''', it is visible only within its own '''package.''' | |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. | |We will learn about '''packages''' in the later tutorials. | ||
| Line 250: | Line 253: | ||
|- | |- | ||
| 06:33 | | 06:33 | ||
| − | | We get the output as : | + | | We get the output as :'''We have created a class with 2 variables and 1 method''', |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
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| Line 269: | Line 268: | ||
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| − | | | + | | 06:59 |
| For self assessment, create a '''class''' named '''Employee''' with variables '''emp''' underscore '''number''' and '''emp''' underscore '''name''' . | | 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. | |And '''method''' '''printEmployee''' which displays the '''employee''' information. | ||
| Line 285: | Line 284: | ||
|- | |- | ||
| − | | | + | | 07:22 |
| It summarizes the Spoken Tutorial project. | | It summarizes the Spoken Tutorial project. | ||
|- | |- | ||
| − | | | + | | 07:25 |
| If you do not have good bandwidth, you can download and watch it. | | If you do not have good bandwidth, you can download and watch it. | ||
|- | |- | ||
| − | | | + | | 07:30 |
| The Spoken Tutorial project team: | | The Spoken Tutorial project team: | ||
|- | |- | ||
| − | | | + | | 07:32 |
| Conducts workshops using spoken tutorials. | | Conducts workshops using spoken tutorials. | ||
|- | |- | ||
| − | | | + | | 07:35 |
|Gives certificates to those who pass an online test. | |Gives certificates to those who pass an online test. | ||
Latest revision as of 15:19, 28 March 2017
| 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. |
| 00:19 | Here we are using: Ubuntu version 11.10, JDK 1.6 and Eclipse 3.7.0 |
| 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. |
| 00:50 | Whatever we can see in this world are all objects. |
| 00:54 | And all the objects can be categorized into special groups. |
| 00:59 | Each group is termed as a class. |
| 01:02 | For example, human being is a class. |
| 01:05 | We are all different objects of this class. |
| 01:08 | We all have different properties like eyes, legs, hands etc. |
| 01:13 | which are common to the 'human being' class. |
| 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? |
| 01:26 | A class is the blueprint from which individual objects are created. |
| 01:31 | Structure of a Java Class; A class defines: |
| 01:35 | A set of properties called variables . |
| 01:37 | And a set of behaviors called methods. |
| 01:40 | Now, let us see the syntax for declaring classes. |
| 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. |
| 02:03 | I have already opened Eclipse. |
| 02:09 | Now let us create a Project. |
| 02:11 | So click on File, go to New and click on Java Project. |
| 02:20 | In the New Project Wizard, enter the Project name as ClassDemo with C and D in capital. |
| 02:34 | Then click on Finish. |
| 02:38 | We see that the Project ClassDemo is created. |
| 02:43 | We will now create a Java class named Student. |
| 02:47 | So, right click on ClassDemo, go to New and click on Class. |
| 02:56 | In the New Java Class wizard, type the Name as Student. |
| 03:03 | We can see that the modifier here is public. |
| 03:07 | This shows that the class is visible to all the classes everywhere. |
| 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. |
| 03:26 | In the 'method stubs', select public static void main. |
| 03:31 | Then click on Finish. |
| 03:36 | We can see that the class named Student is created. |
| 03:40 | Now, let me remove the comments. |
| 03:51 | A Student class can contain properties like Name, Roll Number, Marks etc. |
| 03:57 | So, inside this class Student, let me declare two variables roll_Number and name. |
| 04:04 | So, I will type int roll underscore number semicolon. |
| 04:14 | String name semicolon. |
| 04:19 | So, I have declared two variables. |
| 04:22 | Now, a class also contains methods. |
| 04:25 | So, let me create a method named StudentDetail. |
| 04:30 | This method will give the details of each student. |
| 04:34 | So let me type, void studentDetail then opening and closing brackets, curly brackets open. |
| 04:49 | Now, this method will give the roll_number and name of the Student. |
| 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. |
| 05:23 | Next line, type: System dot out dot println within brackets and double quotes The name is plus name and semicolon. |
| 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 2 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. |
| 06:26 | Let me Run the program by pressing Control and F11 keys simultaneously. |
| 06:33 | We get the output as :We have created a class with 2 variables and 1 method, |
| 06:38 | just as we had typed in the main method. |
| 06:46 | Thus we have successfully created a class. |
| 06:50 | So, in this tutorial, we learnt about the 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 [1]. |
| 07:22 | It summarizes 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 [2]. |
| 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. |
