Difference between revisions of "Java/C2/Parameterized-constructors/Gujarati"

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(Created page with '{| border=1 || ''Time''' || '''Narration''' |- | 00:02 | Welcome to the Spoken Tutorial on '''parameterized''' '''constructor''' in''' java'''. |- | 00:08 | In this tutorial…')
 
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| Welcome to the Spoken Tutorial on '''parameterized''' '''constructor''' in''' java'''.
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| પેરામીટરાઈઝ કન્સ્ટ્રક્ટર પરના સ્પોકન ટ્યુટોરીયલમાં તમારું સ્વાગત છે.
  
 
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| In this tutorial we will learn
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| આ ટ્યુટોરીયલમાં આપને શીખીશું,
  
 
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|About a '''parametrized''' '''constructor'''
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|પેરામીટરાઈઝ કન્સ્ટ્રક્ટર વિષે,
  
 
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| And to create a '''parameterized''' '''constructor'''
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|અને પેરામીટરાઈઝ કન્સ્ટ્રક્ટર બનાવવા માટે
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| Here we are using
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| અહીં આપણે,
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* Ubuntu version 11.10 OS
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* Java Development kit  1.6
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*And  Eclipse 3.7.0
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* ઉબુન્ટુઆવૃત્તિ 11.10 OS
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* જાવા ડેવલપમેન્ટ કીટ 1.6
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* અને એક્લીપ્સ 3.7.0
  
 
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|   To follow this tutorial you must know
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| આ ટ્યુટોરીયલ અનુસરવા માટે તમને ખબર હોવી જોઈએ કે,
  
 
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|how to create a default '''constructor''' in '''java''' using '''eclipse'''.
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|એક્લીપ્સની મદદથી જાવામાં ડીફોલ્ટ કન્સ્ટ્રકટર કેવી રીતે બનાવવું.  
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|If not, for relevant tutorials please visit our website which is as shown,
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|જો નહી તો સંબંધિત ટ્યુટોરીયલ માટે નીચે દર્શાવેલ અમારી વેબસાઈટ જુઓ,  
  
 
('''http'''://'''www.spoken'''-'''tutorial.org''')  
 
('''http'''://'''www.spoken'''-'''tutorial.org''')  
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|What is a '''parameterized''' '''constructor'''?
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|પેરામીટરાઈઝ કન્સ્ટ્રક્ટર શું છે?
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|A '''constructor''' that have parameter is called a '''parameterized''' '''constructor'''.
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|કન્સ્ટ્રક્ટર જેને પેરામીટર હોય જે તે પેરામીટરાઈઝ કન્સ્ટ્રક્ટર કહેવાય છે.
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|It can have one or more than one parameter.
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|તેને એક અથવા એક કરતાં વધુ પેરામીટર હોઈ શકે છે.
  
 
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| Let us now create a '''parameterized constructor.'''
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| ચાલો હવે પેરામીટરાઈઝ કન્સ્ટ્રક્ટર બનાવીએ.
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|So in the eclipse, I have ''' Student.java '''file.
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|તો એક્લીપ્સમાં, મારી પાસે '''Student.java ''' ફાઈલ છે.
  
 
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|We created this file in the previous tutorial.
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|આપણે આ ફાઈલ અગાઉના ટ્યુટોરીયલમાં બનાવી હતી.
  
 
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Revision as of 12:49, 2 September 2013

Time' Narration
00:02 પેરામીટરાઈઝ કન્સ્ટ્રક્ટર પરના સ્પોકન ટ્યુટોરીયલમાં તમારું સ્વાગત છે.
00:08 આ ટ્યુટોરીયલમાં આપને શીખીશું,
00:10 પેરામીટરાઈઝ કન્સ્ટ્રક્ટર વિષે,
00:13 અને પેરામીટરાઈઝ કન્સ્ટ્રક્ટર બનાવવા માટે
00:17 અહીં આપણે,
  • ઉબુન્ટુઆવૃત્તિ 11.10 OS
  • જાવા ડેવલપમેન્ટ કીટ 1.6
  • અને એક્લીપ્સ 3.7.0
00:29 આ ટ્યુટોરીયલ અનુસરવા માટે તમને ખબર હોવી જોઈએ કે,
00:32 એક્લીપ્સની મદદથી જાવામાં ડીફોલ્ટ કન્સ્ટ્રકટર કેવી રીતે બનાવવું.
00:37 જો નહી તો સંબંધિત ટ્યુટોરીયલ માટે નીચે દર્શાવેલ અમારી વેબસાઈટ જુઓ,

(http://www.spoken-tutorial.org)

00:44 પેરામીટરાઈઝ કન્સ્ટ્રક્ટર શું છે?
00:48 કન્સ્ટ્રક્ટર જેને પેરામીટર હોય જે તે પેરામીટરાઈઝ કન્સ્ટ્રક્ટર કહેવાય છે.
00:55 તેને એક અથવા એક કરતાં વધુ પેરામીટર હોઈ શકે છે.
00:59 ચાલો હવે પેરામીટરાઈઝ કન્સ્ટ્રક્ટર બનાવીએ.
01:03 તો એક્લીપ્સમાં, મારી પાસે Student.java ફાઈલ છે.
01:09 આપણે આ ફાઈલ અગાઉના ટ્યુટોરીયલમાં બનાવી હતી.
01:15 Now Inside the constructor we will give the variables their default value.


01:21 So roll_number is equal to zero instead of ten.
01:27 And name is equal to null instead of Raman.
01:33 Then type System dot out dot println I am a default constructor.


01:55 So we have created a constructor with no parameters.
02:00 In java, such constructor is also called a default constructor.
02:07 Now we will create another constructor.
02:11 So type Student parentheses.
02:17 Inside parenthesis int the_roll_number comma String the_name.
02:36 So what we have done, is declared a constructor with parameters.
02:43 The name of the constructor Student that is the class name.
02:49 Inside the paranthesis we have given two parameters to the constructor.
02:57 We can give any number of parameters to the constructor.
03:02 Now inside curly brackets type
03:05 System dot out dot println I am a parameterized constructor
03:29 Then roll_number is equal to the_roll_number.
03:43 And name is equal to the_name.


03:53 So we have created a constructor with parameters.
03:58 Now let's call this constructor.
04:02 So in the main method type; student stu2 equal to' new student within parentheses 11 comma in double quotes Raju
04:28 Let's call the studentDetail method.
04:31 So type,stu2.studentDetail.


04:38 Save and Run the program
04:44 We see the output on the console.
04:48 The default constructor is called first.
04:52 It initializes the variables to their default value.
04:56 Then the parameterizerd constructor is called.
05:00 It initializes the variables to the values that are passed as the argument.
05:05 That is 11 and Raju.
05:08 Let us see how the parametrized constructor works.
05:12 When we call the parameterized constructor, we pass two values to it.
05:18 These are called arguments.
05:22 The value 11 is copied to the parameter the_roll_number.
05:31 And the valueRaju is copied to the parameter the_name.
05:41 Then the value of the_roll_number is assigned to roll_number.
05:50 And the value of the_name is assigned to name.
05:55 Hence in the output we see 11 and Raju.
06:00 Let us see the common errors, when we call a parameterised constructor.


06:07 Suppose we pass a single argument to the constructor.
06:11 So remove Raju.
06:15 We get an error. It states that “The constructor Student with parameter (int) is undefined.”
06:24 So the number of arguments must match the number of parameters.
06:30 Here we can retype Raju and resolve the error.
06:36 Alternatively, what we can do is define another constructor with a single parameter.
06:42 Let us do that
06:45 So Student within paranthesis int r number.
07:01 Inside curly brackets, type System dot out dot println
07:13 I am a constructor with a single parameter.
07:29 Then roll_number is equal to r number
07:48 Save the file.
07:51 We see that the error is resolved when we define the constructor.
07:58 Let's Run the program.
08:02 On the console we see that the roll number is assigned the value 11.
08:08 While name is null since the constructor takes only one argument.
08:18 Let us now call back our constructor with two parameters.
08:23 So type Student stu3 is equal to new Student.
08:40 11 comma Raju.
08:46 ThenStu3 dot studentDetail
08:58 Suppose here we pass 11 as String, so add double quotes.
09:08 We get an error.
09:10 It states that “The constructor Student String commaString is undefined.”
09:17 So even the datatype of the argument must match with that of the parameter.
09:25 So now remove the quotes and Save the file.
09:32 Now we do not see an error.
09:35 So Run the program.
09:38 In the output we see three constructors.
09:42 The first one is the default constructor.
09:45 The second one is theConstructor with one parameter.
09:50 And this third one is theConstructor with two parameters.
09:56 This is how we createParameterised constructor in java.


10:05 Why constructor?
10:07 The variables in a class must be initialized each time an instance is created.


10:13 It can be tedious to initialize all the variables.


10:18 So java allows objects to initialize themselves when they are created.


10:25 This is performed through the use of a constructor.
10:30 So in this tutorial, we have learnt
10:33 To create parameterized constructor.
10:36 Functionality of parameterized constructor.
10:39 And the advantage of using constructor.
10:44 For self assessment, create a class Employee.
10:48 Create constructors with different number of parameters.
10:53 To know more about the Spoken Tutorial Project
10:56 Watch the video available at http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
11:02 It summarizes the Spoken Tutorial project
11:06 If you do not have good bandwidth, you can download and watch it


11:10 The Spoken Tutorial Project Team
11:12 Conducts workshops using spoken tutorials
11:14 Gives certificates for those who pass an online test
11:18 For more details, please write to contact@spoken-tutorial.org


11:24 Spoken Tutorial Project is a part of the Talk to a Teacher project
11:28 It is supported by the National Mission on Education through ICT, MHRD, Government of India
11:34 More information on this Mission is available at


11:43 This brings us to the end of the tutorial.
11:46 Thanks for joining.
11:47 This is Prathamesh Salunke signing off.

Jai Hind.

Contributors and Content Editors

Jyotisolanki, Krupali, PoojaMoolya, Pratik kamble

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