Difference between revisions of "Java/C2/Creating-object/English-timed"

Revision as of 14:53, 30 March 2015

Time	Narration
00:01	Welcome to the spoken tutorial on Creating objects.
00:05	In this tutorial, we will learn about: Reference Variables Constructing objects and Memory Allocation for objects.
00:13	Here, we are using : Ubuntu 11.10 JDK 1.6 and Eclipse IDE 3.7.0
00:23	To follow this tutorial, you must know how to create a simple class using Eclipse.
00:29	If not, please see the Spoken Tutorial on these topics available at Spoken hyphen Tutorial dot org.
00:38	We know that variables and methods together form the members of a class.
00:43	To access the members of a class, we need to create an object for the class.
00:48	Now, let us see what an object is.
00:52	An object is an instance of a class.
00:55	Each object consist of state and behavior.
00:58	Recall the example of 'human being' class, we had discussed in the earlier tutorial.
01:04	Object stores its state in fields or variables.
01:08	It exposes its behavior through methods.
01:11	Now let us learn about reference variables.
01:15	We know about the 8 primitive data types in Java.
01:19	All other types refer to objects rather than primitives.
01:23	Variables that refer to objects are reference variables.
01:28	Let us go back to the Student class which we have already created in the earlier tutorial.
01:37	Now, let me remove the main method from this class.
01:49	Now, Save the file by pressing Control and S keys simultaneously.
01:55	Now create another class named TestStudent inside the same project.
02:00	I have already created it.
02:03	In this class I have the main method.
02:06	Now, inside the main method I will create an object of the Student class.
02:11	For that, inside the main method, type:
02:17	Student space stud1 equal to new space Student opening and closing brackets, semicolon.
02:34	Thus, we have created an object of the Student class.
02:37	Here, Student is the name of the class for which the object is to be created.
02:47	stud1 is a reference variable referring to one object of the Student class.
02:53	And the new keyword allocates space for the new object to be created.
02:59	Please note that stud1 is not the object of the Student class.
03:03	It only holds the reference of the new object created.
03:09	Now, let us see what stud1 contains.
03:13	So, next line, type: System dot out dot println within brackets and double quotes stud1 contains space plus stud1 and then semicolon.
03:44	Now, save and run the file TestStudent dot java.
03:53	We get the output as follows.
03:56	So, here Student is the name of the class of the new object created.
04:03	The second part is the memory address of the new object created.
04:08	We can access the fields and methods of the Student class using stud1.
04:15	We will learn about these in the coming tutorials.
04:18	Now, I will create one more object of the Student class.
04:24	So, I will type: Student space stud2 equal to new space Student opening and closing brackets semicolon.
04:47	Now, type: next line System dot out dot println within brackets and double quotes stud2 contains space plus stud2 and then semicolon.
05:19	Now, let us save and run this file.
05:25	We can see that, here, stud1 and stud2 refer to two different objects.
05:31	That is, stud1 and stud2 are referring to two different students.
05:37	They have different roll numbers and names.
05:44	Now, we can make a change here.
05:51	Here, type: Student stud2 equal to stud1.
06:01	Now, save and run this file.
06:06	We can see that, here, both stud1 and stud2 refer to the same object.
06:12	That means, both stud1 and stud2 are referring to the same student with a roll number and name.
06:31	So, in this tutorial, we learnt about:
06:34	* Reference variables
06:35	* Creating object using new operator
06:38	*And assigning references.
06:41	For self assessment,
06:43	Create another class named TestEmployee.
06:46	Create an object of the Employee class with reference variable as emp1.
06:52	To know more about the spoken tutorial project,
06:55	watch the video available at [1].
06:58	It summarizes the Spoken Tutorial project.
07:01	If you do not have good bandwidth, you can download and watch it.
07:05	The Spoken Tutorial project team:
07:07	Conducts workshops using spoken tutorials.
07:10	Gives certificates for those who pass an online test.
07:14	For more details, please write to contact@spoken-tutorial.org
07:20	Spoken Tutorial Project is a part of the Talk to a Teacher project.
07:24	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:31	More information on this mission is available at [2].
07:40	Thus, we have come to the end of this tutorial.
07:43	This is Arya Ratish from IIT Bombay, signing off.
07:46	Thanks for joining us.

Contributors and Content Editors

Arya Ratish, Devisenan, Gaurav, PoojaMoolya, Sandhya.np14, Sneha

Difference between revisions of "Java/C2/Creating-object/English-timed"

Revision as of 14:53, 30 March 2015

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@@ Line 8: / Line 8: @@
 |-
 | 00:05
-|  In this tutorial we will learn about:
+|  In this tutorial, we will learn about:
+* '''Reference Variables'''
+* Constructing '''objects''' and
-* Reference Variables
+* Memory Allocation for '''objects'''.
-* Constructing objects and
-* Memory Allocation for objects
 |-
 | 00:13
-|  Here, we are using :
+| Here, we are using :
 * Ubuntu 11.10
 * JDK 1.6 and
 * Eclipse IDE 3.7.0
 |-
 |  00:23
-|   To follow this tutorial you must know how to create a simple '''class '''using '''Eclipse'''.
+| To follow this tutorial, you must know how to create a simple '''class''' using '''Eclipse'''.
 |-
 | 00:29
-|If not please see the '''spoken-tutorial''' on these topics available at
+|If not, please see the Spoken Tutorial on these topics available at
+'''Spoken''' hyphen '''Tutorial''' dot org.
-'''spoken '''''hyphen''''' tutorial '''''dot '''''org.'''
 |-
 | 00:38
-| | We know that''' variables''' and '''methods''' together form the '''members''' of a '''class'''.
+| | We know that '''variables''' and '''methods''' together form the members of a '''class'''.
 |-
 | 00:43
-|To access the members of a class , we need to create an object for the class.
+|To access the members of a '''class''', we need to create an '''object''' for the class.
 |-
 |00:48
-| | Now let us see what an''' object '''is.
+| | Now, let us see what an '''object''' is.
 |-
 | 00:52
-|An '''object '''is an '''instance''' of a class.
+|An '''object''' is an '''instance''' of a class.
 |-
 | 00:55
 |Each object consist of '''state''' and '''behavior'''.
 |-
 | 00:58
-|Recall the example of '''human being class''' we had discussed in the earlier tutorial.
+|Recall the example of 'human being' '''class''', we had discussed in the earlier tutorial.
 |-
 | 01:04
 |Object stores its state in '''fields''' or '''variables.'''
 |-
 | 01:08
-|It exposes its behavior through''' methods'''.
+|It exposes its behavior through '''methods'''.
 |-
 |  01:11
-|  Now let us learn about''' reference variables.'''
+|  Now let us learn about '''reference variables.'''
 |-
 | 01:15
 |We know about the 8 primitive data types in Java.
 |-
 | 01:19
-|All other types refer to objects rather than primitives.
+|All other types refer to '''objects''' rather than primitives.
 |-
 | 01:23
-|Variables that refer to objects are '''reference variables'''.
+|'''Variables''' that refer to '''objects''' are '''reference variables'''.
 |-
 |   01:28
-|  Let us go back to the '''Student class''' which we have already created in the earlier''' tutorial'''.
+| Let us go back to the '''Student class''' which we have already created in the earlier '''tutorial'''.
 |-
 | 01:37
 |Now, let me remove the '''main''' '''method''' from this '''class'''.
 |-
 | 01:49
-|Now'''Save '''the '''file''' by pressing '''Control '''and '''S '''keys simultaneously.
+|Now, '''Save''' the file by pressing '''Control''' and '''S''' keys simultaneously.
 |-
 | 01:55
-|Now create another '''class''' named '''TestStudent '''inside the same''' project.'''
+|Now create another '''class''' named '''TestStudent''' inside the same '''project.'''
 |-
 | 02:00
 |I have already created it.
 |-
 | 02:03
-|In this '''class '''I have the''' main method.'''
+|In this '''class''' I have the '''main method.'''
 |-
 | 02:06
-|Now inside the main''' method '''I will create an''' object '''of the''' Student class.'''
+|Now, inside the '''main method''' I will create an '''object''' of the '''Student class.'''
 |-
 | 02:11
-|For that, inside the '''main method''', type
+|For that, inside the '''main method''', type:
 |-
 | 02:17
-|'''Student '''''space''''' stud1''' ''equal to'' '''new''' ''space'' '''Student''' ''opening and closing brackets, semicolon''.
+|'''Student''' space '''stud1''' equal to '''new''' space '''Student''' opening and closing brackets, semicolon.
 |-
 | 02:34
-|Thus we have created an '''object''' of the '''Student class'''.
+|Thus, we have created an '''object''' of the '''Student class'''.
 |-
 | 02:37
-|Here,''' Student''' is the name of the''' class '''for which the '''object '''is to be created.
+|Here, '''Student''' is the name of the '''class''' for which the '''object''' is to be created.
 |-
 | 02:47
-|'''stud1''' is a '''reference variable''' referring to one '''object '''of the '''Student''' class.
+|'''stud1''' is a '''reference variable''' referring to one '''object''' of the '''Student''' '''class'''.
 |-
 | 02:53
-|And the''' new keyword''' allocates space for the new '''object''' to be created.
+|And the '''new''' keyword allocates space for the new '''object''' to be created.
 |-
 | 02:59
 |Please note that '''stud1''' is not the '''object''' of the '''Student class'''.
 |-
 | 03:03
 |It only holds the reference of the new '''object''' created.
 |-
 |  03:09
 |  Now, let us see what '''stud1''' contains.
 |-
 | 03:13
-|So next line type '''System''' ''dot '''''out''' ''dot '''''println''' within brackets and double quotes '''stud1''' '''contains''' space ''plus '''''stud1''''' ''and then''' '''''semicolon''.
+|So, next line, type: '''System''' dot '''out''' dot '''println''' within brackets and double quotes '''stud1''' '''contains''' space plus '''stud1''' and then semicolon.
 |-
 | 03:44
-|Now, '''save '''and''' run '''the '''file TestStudent''' ''dot''''' java'''.
+|Now, '''save''' and '''run''' the file '''TestStudent''' dot '''java'''.
 |-
 |  03:53
 | We get the output as follows.
 |-
 | 03:56
-|So here '''Student '''is the name of the '''class '''of the new '''object '''created.
+|So, here '''Student''' is the name of the '''class''' of the new '''object '''created.
 |-
 | 04:03
 |The second part is the '''memory address''' of the new '''object''' created.
 |-
 | 04:08
-|We can access the '''fields '''and '''methods''' of the '''Student class''' using '''stud1'''.
+|We can access the '''fields''' and '''methods''' of the '''Student class''' using '''stud1'''.
 |-
@@ Line 216: / Line 172: @@
 | 04:18
 |  Now, I will create one more '''object''' of the '''Student class'''.
 |-
 | 04:24
-|So, I will type '''Student '''''space '''''stud2 '''''equal to '''''new '''''space '''''Student '''''opening and closing brackets semi-colon.''
+|So, I will type: '''Student''' space '''stud2''' equal to '''new''' space '''Student''' opening and closing brackets semicolon.
 |-
 |  04:47
-| Now type next line '''System''''' dot'' '''out '''''dot '''''println''' ''within brackets and double quotes '''''stud2 contains space '''''plus '''''stud2 '''and then ''semicolon.''
+| Now, type: next line '''System''' dot '''out''' dot '''println''' within brackets and double quotes '''stud2 contains''' space plus '''stud2''' and then semicolon.
 |-
 | 05:19
-|Now, let us save and run this file.
+|Now, let us '''save''' and '''run''' this file.
 |-
 |  05:25
-| We can see that here '''stud1 '''and '''stud2 '''refers to two different '''objects'''.
+| We can see that, here, '''stud1''' and '''stud2''' refer to two different '''objects'''.
 |-
 | 05:31
-|That is, '''stud1 '''and '''stud2''' are referring to two different students.
+|That is, '''stud1''' and '''stud2''' are referring to two different students.
 |-
@@ Line 247: / Line 199: @@
 |-
 |   05:44
-|  Now, we can make a change here.
+| Now, we can make a change here.
 |-
 | 05:51
-|Here type '''Student stud2''' ''equal to'' '''stud1.'''
+|Here, type: '''Student stud2''' equal to '''stud1.'''
 |-
 | 06:01
-|Now, '''save''' and '''run''' this''' file'''.
+|Now, '''save''' and '''run''' this file.
 |-
 | 06:06
-|   We can see that here both''' stud1''' and '''stud2 '''refers to the same '''object.'''
+| We can see that, here, both '''stud1''' and '''stud2 '''refer to the same '''object.'''
 |-
 | 06:12
-|That  means both '''stud1 '''and '''stud2 '''are referring to the same '''student''' with a roll number and name.
+|That means, both '''stud1''' and '''stud2 '''are referring to the same '''student''' with a roll number and name.
 |-
 |  06:31
-|  So in this tutorial we learnt about
+| So, in this tutorial, we learnt about:
 |-
 | 06:34
-|Reference variables
+|* Reference variables
 |-
 |06:35
-| Creating object using new operator
+|* Creating object using new operator
 |-
 | 06:38
-|And  Assigning references
+|*And  assigning references.
 |-
 | 06:41
-|  For self assessment
+| For self assessment,
 |-
 | 06:43
-| create another '''class''' named '''TestEmployee'''.
+| Create another '''class''' named '''TestEmployee'''.
 |-
 | 06:46
-| Create an '''object '''of the '''Employee class'''  with ''reference variable'' as '''emp1'''.
+| Create an '''object''' of the '''Employee class'''  with '''reference variable''' as '''emp1'''.
 |-
 |  06:52
-| To know more about the spoken tutorial project.
+| To know more about the spoken tutorial project,
 |-
 | 06:55
-|Watch the video available at [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial http://spoken-][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial tutorial.org/What_is_a_Spoken_Tutorial]
+|watch the video available at [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial].
 |-
 | 06:58
-| It summarises the Spoken Tutorial project
+| It summarizes the Spoken Tutorial project.
 |-
 | 07:01
-| 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.
 |-
 |  07:05
-| | The Spoken Tutorial Project Team
+| | The Spoken Tutorial project team:
 |-
 | 07:07
-|Conducts workshops using spoken tutorials
+|Conducts workshops using spoken tutorials.
 |-
 | 07:10
-| Gives certificates for those who pass an online test
+| Gives certificates for those who pass an online test.
 |-
 | 07:14
 | For more details, please write to contact@spoken-tutorial.org
 |-
 | 07:20
-|  Spoken Tutorial Project is a part of the Talk to a Teacher project
+|  Spoken Tutorial Project is a part of the Talk to a Teacher project.
 |-
 | 07:24
-|It 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.
 |-
 | 07:31
-| More information on this Mission is available at
+| More information on this mission is available at
-  [http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org/NMEICT-Intro]
+ [http://spoken-tutorial.org/NMEICT-Intro].
 |-
 | 07:40
-| Thus we  have come to the end of this tutorial.
+| Thus, we  have come to the end of this tutorial.
 |-
 | 07:43
-|This is Arya Ratish from IIT Bombay signing off.
+|This is Arya Ratish from IIT Bombay, signing off.
 |-
 | 07:46
 |Thanks for joining us.