Trupti at 07:25, 3 May 2014

2014-05-03T07:25:13Z

Trupti: Created page with ''''Title of script''': Calling '''methods''' of the '''super class''' '''Author: Arya Ratish''' '''Keywords: '''super keyword, video tutorial, Java, Eclipse IDE {| style="bo…'

2014-05-03T07:23:02Z

Created page with ''''Title of script''': Calling '''methods''' of the '''super class''' '''Author: Arya Ratish''' '''Keywords: '''super keyword, video tutorial, Java, Eclipse IDE {| style="bo…'

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'''Title of script''': Calling '''methods''' of the '''super class'''

'''Author: Arya Ratish'''

'''Keywords: '''super keyword, video tutorial, Java, Eclipse IDE

{| style="border-spacing:0;"
| style="border:0.05pt solid #000000;padding:0.106cm;"| <center>'''Visual Cue'''</center>
| style="border:0.05pt solid #000000;padding:0.106cm;"| <center>'''Narration'''</center>

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Slide 1
| style="border:0.05pt solid #000000;padding:0.106cm;"| Welcome to the spoken-tutorial on '''Calling methods of the super class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Slide 2
| style="border:0.05pt solid #000000;padding:0.106cm;"| In this tutorial we will learn  :

* when to use the '''super keyword'''
* how to call '''methods '''of the '''super class'''
* how to invoke the '''constructor '''of the '''super class'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Slide 3

Software Requirements
| style="border:0.05pt solid #000000;padding:0.106cm;"| Here we are using

* Ubuntu Version 12.04
* JDK 1.7
* Eclipse 4.3.1

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Slide 4

Prerequisites
| style="border:0.05pt solid #000000;padding:0.106cm;"| To follow this tutorial, you must have basic knowledge of '''Java and Eclipse IDE.'''

You must also have knowledge of '''subclassing '''and '''method overriding'''.

If not, for relevant tutorials, please visit our website.

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Slide 5

Using '''super keyword'''

| style="border:0.05pt solid #000000;padding:0.106cm;"| A '''subclass '''can use a '''superclass''' '''data '''or '''method '''using the '''super keyword.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Slide 6

Using '''super keyword'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| 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.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Go to the '''IDE.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Now, let us go to the '''IDE '''and to the '''project '''we created earlier.

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Go to the '''Manager class.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Let us go to the '''Manager class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Come to the '''getDetails() method.'''

Remove '''Name '''and '''Email.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Now, come to the '''getDetails() method.'''

In the '''return '''statement, let us remove '''Name '''and '''Email.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Go to the '''Employee class.'''

Highlight the '''getDetails() method.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Let us come to the '''Employee class.'''

This is the '''parent class '''or '''super class.'''

We already have a '''getDetails() method '''here'''.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Highlight the '''return statement.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| This method '''returns '''the '''name '''and '''email.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| So, we can use the '''getDetails() method '''in the '''Manager class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Go to the '''Manager class.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| We will come to the '''Manager class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| We will call  '''getDetails() method '''from the '''Employee class, '''inside the '''Manager class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Come to the '''getDetails() method.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| So, come to the '''getDetails() method.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Inside the '''return statement '''type '''super '''''dot '''''getDetails().'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Inside the '''return statement '''type

'''super dot getDetails()  '''''plus within double quotes '''''Manager of '''''plus '''''department.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| '''Run '''the '''program.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Now, let me '''run''' the '''program '''again.

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Highlight the '''output.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| We can see that we get the '''Manager details.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Come back to the '''Employee class.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Come back to the '''Employee class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| Let us include a '''constructor '''here.

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Type

'''public Employee(String name, String email_address)  {'''

'''this.name=name;'''

'''this.email_address=email_address;'''

'''}'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| So inside the '''Employee class, '''type

'''public space''' '''Employee '''''within brackets '''''String name, String email_address '''

Within curly brackets, type

'''this dot''' '''name is equal to name semicolon'''

'''this dot''' '''email_address is equal to email_address semicolon'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| Also comment the '''setter '''and '''getter methods.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Type

'''public String getDetails() '''

'''{'''

'''return("Name: " + name + "\n" + "Email: " + email_address);'''

'''}'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Inside the '''getDetails() method,  '''

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

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| A '''subclass '''inherits all of the '''methods '''and '''variables '''from a '''parent class'''.

Note that it does not '''inherit constructors.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| But, '''constructors '''can call the '''non-private constructors '''of its '''superclass.'''

We do this using the keyword '''super '''from the '''child class constructor.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Come to the '''Manager class.'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| We will see that now.

For that, come to the '''Manager class.'''

Now, we will include a '''constructor '''here.

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Type

'''public Manager(String name, String email_address, String dept) {'''

'''super(name,email_address);'''

'''department=dept;'''

'''}'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Type

'''public space''' '''Manager '''''within brackets '''''String '''''space '''''name, String space''' '''email ''' '''address, String space''' '''dept '''

Then within curly brackets, type

'''super '''''within brackets '''''name, email address semicolon'''

Then type,

'''department is equal to''' '''dept semicolon'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| Here we will comment the '''setter and getter methods.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Type

'''public String getDetails() {'''

'''return ( super.getDetails()+"\n"'''

'''+"Manager of: " + department);'''

'''}'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Then, in the '''getDetails() method '''type '''department '''instead of '''getDepartment.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| Now, come to the '''TestEmployee class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Comment '''manager.setName("Nikkita Dinesh");'''

'''manager.setEmail("abc@gmail.com");'''

'''manager.setDepartment("Accounts");'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Comment the call to the '''setter methods.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Type

'''Manager manager= new Manager("Nikkita Dinesh", "abc@gmail.com", "Accounts");'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Now, inside the call to the '''Manager constructor '''type ''within quotes '''''Nikkita Dinesh, [mailto:abc@gmail.com abc@gmail.com], Accounts'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| Now, run the '''program.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| Highlight

'''Name: Nikkita Dinesh'''

'''Email: abc@gmail.com'''

'''Manager of: Accounts'''

| style="border:0.05pt solid #000000;padding:0.106cm;"| We get the output as shown.

We get the '''Manager details.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"|
| style="border:0.05pt solid #000000;padding:0.106cm;"| In this way, we can call the '''constructor '''of the '''super class.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| '''Slide 7'''

'''Summary'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| In this tutorial we have learnt:

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

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| '''Slide 8'''

'''Assignment'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| Assignment

* Open the previous assignment.
* Call the '''Vehicle class run method '''in the '''Bike class.'''
* The output should be:
** '''The Vehicle is running.'''
** '''The Bike is running safely.'''

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| '''Slide 9'''

'''About Spoken Tutorial Project'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| * Watch the video available at the following link
* It summarizes the Spoken Tutorial project

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

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| '''Slide 10'''

'''About Spoken Tutorial workshops'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| 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

|-
| style="border:0.05pt solid #000000;padding:0.106cm;"| '''Slide 11'''

'''Acknowledgement'''
| style="border:0.05pt solid #000000;padding:0.106cm;"| 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

This is '''Arya Ratish '''from '''IIT Bombay '''signing off.

Thanks for joining.

|}

@@ Line 31: / Line 31: @@
 | style="border:0.05pt solid #000000;padding:0.106cm;"| Here we are using
-* Ubuntu Version 12.04
+* '''Ubuntu Version 12.04'''
-* JDK 1.7
+* '''JDK 1.7'''
-* Eclipse 4.3.1
+* '''Eclipse 4.3.1'''

Java/C3/Calling-methods-of-the-superclass/English - Revision history

Trupti at 07:25, 3 May 2014

Trupti: Created page with ''''Title of script''': Calling '''methods''' of the '''super class''' '''Author: Arya Ratish''' '''Keywords: '''super keyword, video tutorial, Java, Eclipse IDE {| style="bo…'