Pratik kamble at 07:17, 15 July 2014

2014-07-15T07:17:11Z

Pratik kamble at 07:16, 15 July 2014

2014-07-15T07:16:30Z

Pratik kamble at 07:20, 23 June 2014

2014-06-23T07:20:38Z

Krupali at 10:46, 26 August 2013

2013-08-26T10:46:49Z

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Jyotisolanki at 10:35, 19 August 2013

2013-08-19T10:35:53Z

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Jyotisolanki at 10:04, 19 August 2013

2013-08-19T10:04:34Z

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Jyotisolanki: Created page with '{| border=1 || ''Time''' || '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on''' Creating objects.''' |- | 00:05 | In this tutorial we will learn about: * Ref…'

2013-08-19T09:37:47Z

Created page with '{| border=1 || ''Time''' || '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on''' Creating objects.''' |- | 00:05 | In this tutorial we will learn about: * Ref…'

New page

{| border=1
|| ''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
|No 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 semi-colon.''

|-
| 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 '''refers 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 '''refers to the same '''object.'''

|-
| 06:12
|That means both '''stud1 '''and '''stud2 '''are referring to the same '''object''' 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 [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]

|-
| 06:58
| It summarises 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
[http://spoken-tutorial.org/NMEICT-Intro http://spoken-tutorial.org/NMEICT-Intro]

|-
| 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.

@@ Line 281: / Line 281: @@
 | 07:14
 | વધુ વિગત માટે, કૃપા કરી '''contact@spoken-tutorial.org''' પર સંપર્ક કરો.
 |-

@@ Line 265: / Line 265: @@
 | 07:01
 | જો તમારી બેન્ડવિડ્થ સારી ન હોય, તો તમે ડાઉનલોડ કરી તે જોઈ શકો છો.
 |-
@@ Line 282: / Line 281: @@
 | 07:14
 | વધુ વિગત માટે, કૃપા કરી '''contact@spoken-tutorial.org''' પર સંપર્ક કરો.

@@ Line 1: / Line 1: @@
 {| border=1
-|| ''Time'''
+|| '''Time'''
 || '''Narration'''
 |-

Java/C2/Creating-object/Gujarati - Revision history

Pratik kamble at 07:17, 15 July 2014

Pratik kamble at 07:16, 15 July 2014

Pratik kamble at 07:20, 23 June 2014

Krupali at 10:46, 26 August 2013

Jyotisolanki at 10:35, 19 August 2013

Jyotisolanki at 10:04, 19 August 2013

Jyotisolanki: Created page with '{| border=1 || ''Time''' || '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on''' Creating objects.''' |- | 00:05 | In this tutorial we will learn about: * Ref…'