Java/C3/Using-final-keyword/English - Revision history

Nancyvarkey at 09:24, 24 April 2015

2015-04-24T09:24:20Z

Nancyvarkey at 05:55, 13 April 2015

2015-04-13T05:55:37Z

Nancyvarkey at 09:48, 6 August 2014

2014-08-06T09:48:03Z

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Trupti at 13:03, 5 August 2014

2014-08-05T13:03:22Z

Trupti at 12:59, 5 August 2014

2014-08-05T12:59:21Z

Trupti at 12:58, 5 August 2014

2014-08-05T12:58:02Z

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Trupti at 10:33, 5 August 2014

2014-08-05T10:33:51Z

Trupti at 10:14, 5 August 2014

2014-08-05T10:14:50Z

Trupti at 10:09, 5 August 2014

2014-08-05T10:09:35Z

Trupti at 07:31, 5 August 2014

2014-08-05T07:31:27Z

@@ Line 427: / Line 427: @@
 | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| This is because if you make any '''method''' as '''final''', you cannot '''override''' it.
-'''Manager class method getDetails overrides getDetails method in Employee class. '''
+'''Manager class method getDetails''' overrides '''getDetails method''' in '''Employee class. '''
 |-
@@ Line 483: / Line 483: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Remove the''' final''' keyword before '''Employee()'''
-| style="border:1pt solid #000000;padding:0.097cm;"| This is because, '''constructor''' cannot be '''final''' since '''constructors''' are not inherited.
+| style="border:1pt solid #000000;padding:0.097cm;"| This is because, '''constructor''' cannot be '''final''' since '''constructors''' cannot not be inherited.
 We will remove the '''final''' keyword before the '''constructor'''.
@@ Line 533: / Line 533: @@
 | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| Come back to '''Employee''' class and remove the''' final''' keyword
 | style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding:0.097cm;"| So let's come back to''' Employee''' class and remove the '''final '''keyword.
 |-
@@ Line 585: / Line 587: @@
 '''About Spoken Tutorial Project'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Watch the video available at the following link [http://spoken-tutorial.org/What http://spoken-tutorial.org/What] is a Spoken Tutorial'''
+| style="border:1pt solid #000000;padding:0.097cm;"| Watch the video available at the following link.  It summarizes the Spoken Tutorial project
-−
-* It summarizes the Spoken Tutorial project
-−
-* If you do not have good bandwidth, you can download and watch it
 |-
@@ Line 598: / Line 596: @@
 | style="border:1pt solid #000000;padding:0.097cm;"| The Spoken Tutorial Project Team
-* Conducts workshops using spoken tutorials
+* Conducts workshops
 * Gives certificates for those who pass an online test
-* For more details, please write to contact at spoken hyphen tutorial dot org
+* For more details, please write to us
 |-
@@ Line 608: / Line 606: @@
-| style="border:1pt solid #000000;padding:0.097cm;"| Spoken Tutorial Project is a part of the Talk to a Teacher project
+| style="border:1pt solid #000000;padding:0.097cm;"| Spoken Tutorial Project is supported by the National Mission on Education through ICT, MHRD, Government of India.
-* It is supported by the National Mission on Education through ICT, MHRD, Government of India
+That's it for this tutorial.
-* More information on this Mission is available at
-* [http://spoken-tutorial.org/NMEICT- http][http://spoken-tutorial.org/NMEICT- ://][http://spoken-tutorial.org/NMEICT- spoken][http://spoken-tutorial.org/NMEICT- -][http://spoken-tutorial.org/NMEICT- tutorial][http://spoken-tutorial.org/NMEICT- .][http://spoken-tutorial.org/NMEICT- org][http://spoken-tutorial.org/NMEICT- /][http://spoken-tutorial.org/NMEICT- NMEICT][http://spoken-tutorial.org/NMEICT- -] Intro
-This is Trupti Kini from '''IIT Bombay''' signing off.
+This is Trupti Kini from '''IIT Bombay'''.
-Thanks for joining.
+Thank you very much for watching.
 |}

@@ Line 404: / Line 404: @@
 | style="border:1pt solid #000000;padding:0.097cm;"| Type final keyword before '''getDetails.'''
 | style="border:1pt solid #000000;padding:0.097cm;"| Add '''final '''keyword before '''method getDetails'''.
 |-

@@ Line 493: / Line 493: @@
 | style="border:1pt solid #000000;padding:0.097cm;"| Now we will learn whether constructor can me declared as''' final '''or not
- For that we will again create a constructor.
+For that we will again create a constructor.
 So instead of '''static''' we will type, Employee parentheses.

@@ Line 352: / Line 352: @@
 '''Manager of: Accounts'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We got the desired output,
+| style="border:1pt solid #000000;padding:0.097cm;"|
- We have successfully initialized static final variable.
+We have successfully initialized static final variable.

@@ Line 148: / Line 148: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| '''Save''' and '''Run''' the program.
-| style="border:1pt solid #000000;padding:0.097cm;"| Now lets '''Save''' the class and '''Run''' the program.
+| style="border:1pt solid #000000;padding:0.097cm;"| Now let us '''Save''' the class and '''Run''' the program.
 |-
@@ Line 174: / Line 174: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Go to''' Employee''' class'''->'''variable''' name'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Go to the '''Employee '''class.
+| style="border:1pt solid #000000;padding:0.097cm;"|
-−
 Now come to the '''final variable''' '''name.''' in Employee class.
@@ Line 234: / Line 233: @@
-and inside the curly brackets, lets initialize the variable''' name''' with value ''' Sneha.'''
+and inside the curly brackets, lets initialize the variable''' name''' with value ''' Sneha.''' semicolon
 |-
@@ Line 324: / Line 323: @@
-For that, in the '''Employee '''class, go to the '''constructor. ''' we created
+For that, in the '''Employee '''class, come to the '''constructor. ''' we created
@@ Line 381: / Line 380: @@
 Inside the '''method''' we will type,
-newEmail is equal to inside double quotes abc@gmail.com semicolon.
+newEmail is equal abc@gmail.com semicolon.
 We have modified the final variable newEmail.
@@ Line 401: / Line 400: @@
 So lets remove the variable modification.
-'''<nowiki><<</nowiki>PAUSE>>'''
+'''<nowiki><<</nowiki>'''
 |-
@@ Line 529: / Line 528: @@
 | style="border:1pt solid #000000;padding:0.097cm;"|
 To know the actual error, lets come to TestEmployee class and comment the lines
-manager.setName("Nikita Dinesh");
 manager.setEmail("abc@gmail.com");
 manager.setDepartment("Accounts");
@@ Line 577: / Line 576: @@
 | style="border:1pt solid #000000;padding:0.097cm;"| As an assignment
+Repeat the steps of''' Using final keyword '''tutorial for the''' Bike''' and''' Vehicle class.'''
-** Are you sure about the name of the tutorial? Pls chkThe bike vehicle was given as an assignment in the previous tutorial.<br/> We need to frame it properly.Pls frame it properly.doneRepeat the steps of''' Using final keyword '''tutorial for the''' Bike''' and''' Vehicle class.'''
+whoch we use din the previous tutorial
 ** Write down the classes in java that are '''final''' classes.

@@ Line 65: / Line 65: @@
 '''final''' is a '''keyword''' or '''reserved''' word in '''Java'''.
-It can be applied to '''variables, methods '''and''' classes.'''
+It can be applied to '''variables, methods '''or''' classes.'''
 |-
@@ Line 91: / Line 91: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Point to the variable''' name'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Come to the variable called''' name.'''
+| style="border:1pt solid #000000;padding:0.097cm;"| Come to the variable ''' name.'''
 |-
@@ Line 120: / Line 120: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| This is because here the '''final''' '''variable''' is already declared and initialised.
+| style="border:1pt solid #000000;padding:0.097cm;"| This is because here the '''final''' '''variable''' name is already declared and initialised.
 We can initialize a final variable only once.

@@ Line 482: / Line 482: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Type '''final '''before the constructor
-| style="border:1pt solid #000000;padding:0.097cm;"| Add '''final '''before the '''constructor'''.
+| style="border:1pt solid #000000;padding:0.097cm;"| Add '''final ''' keyword before the '''constructor'''.
 |-
@@ Line 492: / Line 492: @@
 '''modifier final not allowed here'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We get error once.
+| style="border:1pt solid #000000;padding:0.097cm;"| We get error
 '''Illegal modifier for the constructor in type Employee'''
@@ Line 503: / Line 503: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| Next, we will learn about''' final class.'''
+| style="border:1pt solid #000000;padding:0.097cm;"| Now, we will learn about''' final class.'''
@@ Line 518: / Line 518: @@
 '''The type Manager cannot subclass the final class Employee'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We get an
+| style="border:1pt solid #000000;padding:0.097cm;"| We get an error,
-−
-'''“The type Manager cannot subclass the final class Employee.”'''
-−
 |-
-| style="border:1pt solid #000000;padding:0.097cm;"| Slide 10
+| style="border:1pt solid #000000;padding:0.097cm;"| Highlight the compilation error,
-| style="border:1pt solid #000000;padding:0.097cm;"| This is because if you make any '''class''' as '''final''', you cannot '''extend''' it.
-|-
+'''The type Manager cannot subclass the final class Employee'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Remove the keyword '''final '''before '''Employee '''class
+| style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| Remove the '''keyword''' '''final '''before '''Employee class'''.
+To know the actual error, lets come to TestEmployee class and comment the lines
+manager.setName("Nikita Dinesh");
-|-
+manager.setEmail("abc@gmail.com");
-| style="border:1pt solid #000000;padding:0.097cm;"| '''Save''' and '''Run''' the program.
+manager.setDepartment("Accounts");
-| style="border:1pt solid #000000;padding:0.097cm;"| Now '''Save''' and '''Run''' the program.
-−
-|-
-| style="border:1pt solid #000000;padding:0.097cm;"| Highlight the output,
-−
-−
-−
-| style="border:1pt solid #000000;padding:0.097cm;"| This time we get the output,
-−
-'''Name: Sneha'''
-'''Email: abc@gmail.com'''
+Save the class and run the program
-'''Manager of: Accounts'''
+Save the class and run the program.
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| Let us summarize.
+| style="border:1pt solid #000000;padding:0.097cm;"| Now lets summarize
 |-
@@ Line 564: / Line 558: @@
-| style="border:1pt solid #000000;padding:0.097cm;"| In this tutorial we have learnt:
+| style="border:1pt solid #000000;padding:0.097cm;"| In this tutorial we learnt:
 * When to invoke final keyword.

@@ Line 383: / Line 383: @@
 newEmail is equal to inside double quotes abc@gmail.com semicolon.
+We have modified the final variable newEmail.
-−
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| '''Save''' &''' Run''' the program.
-| style="border:1pt solid #000000;padding:0.097cm;"| Once again '''Save''' & '''Run '''the program.
+| style="border:1pt solid #000000;padding:0.097cm;"| Once again  we will '''Save''' & '''Run '''the program.
 |-
@@ Line 394: / Line 393: @@
 '''final parameter newEmail may not be assigned'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We will get a compilation error.
+| style="border:1pt solid #000000;padding:0.097cm;"| We get error.
+The final local variable newEmail cannot be assigned.
-'''“final parameter newEmail may not be assigned”'''
 |-
@@ Line 402: / Line 400: @@
 | style="border:1pt solid #000000;padding:0.097cm;"| This is because '''final''' variable as parameter to a '''method '''cannot be modified by that '''method.'''
+So lets remove the variable modification.
 '''<nowiki><<</nowiki>PAUSE>>'''
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| Now let’s learn about''' final''' '''method'''.
+| style="border:1pt solid #000000;padding:0.097cm;"| Now we will learn about''' final''' '''method'''.
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Go to '''Employee '''class
-Go to the method''' setEmail'''
+Come to the method''' getDetails''' in employee class.
-| style="border:1pt solid #000000;padding:0.097cm;"| Come back to the '''Employee class'''.
+| style="border:1pt solid #000000;padding:0.097cm;"| Come to the method''' getDetails''' in employee class.
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Type final keyword before''' getDetails.'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Add''' final''' '''keyword''' before''' getDetails '''to make it final.
+| style="border:1pt solid #000000;padding:0.097cm;"|
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| '''Save''' and '''Run''' the program.
-| style="border:1pt solid #000000;padding:0.097cm;"| And as before, '''Save '''and '''Run''' the program.
+| style="border:1pt solid #000000;padding:0.097cm;"| '''Save '''and '''Run''' the program.
 |-
@@ Line 439: / Line 429: @@
 '''Cannot override the final method from Employee'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We get compilation error,
+| style="border:1pt solid #000000;padding:0.097cm;"| We get error,
-'''“Cannot override the final method from Employee.”'''
+'''class Manager overrides final method getDetails.()'''
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| This is because if you make any''' method''' as '''final''', you cannot''' override''' it.
+| style="border:1pt solid #000000;padding:0.097cm;"|
 |-
@@ Line 462: / Line 455: @@
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Go to '''Eclipse IDE'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Let us switch back to '''Eclipse IDE.'''
+| style="border:1pt solid #000000;padding:0.097cm;"| Switch back to '''Eclipse IDE.'''
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Go to '''Employee''' class
-| style="border:1pt solid #000000;padding:0.097cm;"| Now, let us see whether '''constructor''' can be declared as '''final '''or not.
+| style="border:1pt solid #000000;padding:0.097cm;"|
+In Employee class remove final keyword before method getDetails.
-Come to the''' Employee class.'''
+Remove static keyword before final variable name.
 |-
@@ Line 479: / Line 472: @@
-| style="border:1pt solid #000000;padding:0.097cm;"| Let us create a '''constructor''' again as''' Employee.'''
+| style="border:1pt solid #000000;padding:0.097cm;"|
-Type
+So instead of static we will type,
 |-
@@ Line 504: / Line 492: @@
 '''modifier final not allowed here'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We get a compilation error once again.
+| style="border:1pt solid #000000;padding:0.097cm;"| We get error once.
-'''“modifier final not allowed here”'''
+'''Illegal modifier for the constructor in type Employee'''
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
 | style="border:1pt solid #000000;padding:0.097cm;"| This is because '''constructor''' cannot be''' final''' since '''constructors''' are not inherited.
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"|
-| style="border:1pt solid #000000;padding:0.097cm;"| Next, let us learn about''' final class.'''
+| style="border:1pt solid #000000;padding:0.097cm;"| Next, we will learn about''' final class.'''
 |-
 | style="border:1pt solid #000000;padding:0.097cm;"| Type '''final '''keyword before the class '''Employee.'''
-| style="border:1pt solid #000000;padding:0.097cm;"| Add''' final''' '''keyword''' before the '''class''' '''Employee.'''
+| style="border:1pt solid #000000;padding:0.097cm;"| Add''' final''' '''keyword''' before the '''class''' '''Employee.''' to make it final.
 |-
@@ Line 532: / Line 518: @@
 '''The type Manager cannot subclass the final class Employee'''
-| style="border:1pt solid #000000;padding:0.097cm;"| We get the compilation error again. The error msg says-
+| style="border:1pt solid #000000;padding:0.097cm;"| We get an
 '''“The type Manager cannot subclass the final class Employee.”'''