View source for Java/C3/Calling-methods-of-the-superclass/English-timed



{| border=1
| <center>'''Time'''</center>
| <center>'''Narration'''</center>

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| 00:01
| Welcome to the spoken-tutorial on '''Calling methods of the super class.'''

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| 00:07
| In this tutorial we will learn ;  when to use the '''super keyword'''

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| 00:13
| How to call '''methods '''of the '''super class'''

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| 00:17
| How to invoke the '''constructor '''of the '''super class'''

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| 00:22
| Here we are using

'''Ubuntu Version 12.04'''
'''JDK 1.7'''
'''Eclipse 4.3.1'''

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| 00:32
| To follow this tutorial, you must have basic knowledge of '''Java and Eclipse IDE.'''

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| 00:39
| You must also have knowledge of '''subclassing '''and '''method overriding''' in Java.

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| 00:45
| If not, for relevant tutorials, please visit our website.

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| 00:51
| A '''subclass '''can use a '''superclass''' '''data '''or '''method '''using the '''super keyword.'''

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| 00:58
| The '''super keyword ''':
refers to the '''instance variable''' of the '''parent class.''' 
is used to invoke '''parent class constructor'''.
is used to invoke '''parent class method.'''

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| 01:13
| Now, let us go to the '''IDE '''and to the '''project '''we created earlier.

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| 01:19
| Let us go to the '''Manager class.'''

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| 01:22
| Now, come to the '''getDetails() method.'''

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| 01:26
| In the '''return '''statement, let us remove '''Name '''and '''Email.'''

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| 01:32
| Now, let us come to the '''Employee class.'''

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| 01:36
| This is the '''parent class '''or '''super class.'''

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| 01:41
| We already have a '''getDetails() method '''here'''.'''

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| 01:46
| This method '''returns '''the '''name '''and '''email.'''

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| 01:51
| So, we can use this '''getDetails() method '''in the '''Manager class.'''

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| 01:57
| We will call '''getDetails() method '''from the '''Employee class, '''inside the '''Manager class.'''

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| 02:04
| So, come to the '''getDetails() method ''' in the manager class.

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| 02:10
| Inside the '''return statement '''type '''super dot getDetails() '''''plus slash n '''''Manager of '''''get '''''department.'''

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| 02:22
| Now, let me '''run''' the '''program '''

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| 02:25
| We can see that we get the '''Manager details.''' thus we can call the method of superclass inside the subclass

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| 02:36
| Now let us come to the  '''Employee class.'''

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| 02:41
| Let us include a '''constructor '''here.

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| 02:44
| So inside the '''Employee class, '''type  '''public space''' '''Employee '''''within brackets '''''String name, String email_address '''

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| 02:59
| Within curly brackets, type '''this dot''' '''name is equal to name semicolon'''. '''this dot''' '''email_address is equal to email_address '''

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| 03:17
| Now let us comment the '''setter '''and '''getter methods.'''

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| 03:23
| Inside the '''getDetails() method, '''

instead of '''getName '''type '''name, '''
instead of '''getEmail '''type '''email_address.'''

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| 03:37
| A '''subclass '''inherits all of the '''methods '''and '''variables '''from a '''parent class'''.

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| 03:44
| Note that it does not '''inherit constructors.'''

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| 03:49
| But, '''constructors '''can call the '''non-private constructors '''of its '''superclass.'''

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| 03:55
| We do this using the keyword '''super '''from the '''child class constructor.'''

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| 04:01
| We will see that now. 

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| 04:04 
|For that, come to the '''Manager class.''' We will include a '''constructor '''here.

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| 04:10
| So, type '''public space''' '''Manager '''''within brackets '''''String '''''space '''''name, String space''' '''email ''' underscore '''address, String space''' '''dept '''

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| 04:30
|Then within curly brackets, type '''super '''''within brackets '''''name, email underscore address semicolon'''

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| 04:44
|Then type, '''department is equal to''' '''dept semicolon'''

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| 04:51
| Here we will comment the '''setter and getter methods.'''

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| 04:56
| Then, in the '''getDetails() method '''type '''department '''instead of '''getDepartment.''' 

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| 05:05
| Now, come to the '''TestEmployee class.'''

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| 05:09
| Comment the call to the '''setter methods.'''

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| 05:15
| Now, inside the call to the '''Manager constructor '''type ''within quotes '''''Nikkita Dinesh,  abc@gmail.com, Accounts'''

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| 05:32
| Now, run the '''program.'''

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| 05:35
| We get the output as shown. We get the '''Manager details.'''

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| 05:40
| In this way, we can call the '''constructor '''of the '''super class.'''

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| 05:45
| In this tutorial we have learnt:

the '''super keyword '''
calling the method of the '''super class '''and
invoking constructor of '''super class'''

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| 05:56
| As an Assignment
Open the previous assignment.
Call the '''Vehicle class run method '''in the '''Bike class.'''

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| 06:04
| The output should be:
'''The Vehicle is running.'''
'''The Bike is running safely.'''

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| 06:10
|  To know more about the Spoken Tutorial Project,  Watch the video available at the following link

|-
| 06:17
| It summarizes the Spoken Tutorial project . If you do not have good bandwidth, you can download and watch it

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| 06:26
| 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 at spoken hyphen tutorial dot org

|-
| 06:42
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 06:46
| It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
| 06:54
| More information on this Mission is available at  http://spoken-tutorial.org/NMEICT- Intro

|-
| 07:05
|This is '''Arya Ratish '''from '''IIT Bombay '''signing off. Thanks for joining.

|}