Difference between revisions of "Java/C2/Constructor-overloading/English-timed"

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| Welcome to the Spoken Tutorial on '''constructor overloading''' in''' java'''.
 
| Welcome to the Spoken Tutorial on '''constructor overloading''' in''' java'''.
  
 
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|-
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|   In this tutorial, we will learn  
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| In this tutorial, we will learn  
  
 
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|-
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| what is '''constructor overloading'''
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| what is '''constructor overloading'''
  
 
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|-
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| and  to '''overload''' '''constructor'''.
 
| and  to '''overload''' '''constructor'''.
  
 
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| 00:16
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|   Here we are using:  
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| Here we are using:  
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* '''Ubuntu version 11.10 OS'''
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'''Ubuntu version 11.10 OS'''
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* '''Java Development kit 1.6'''
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'''Java Development kit 1.6'''
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* '''Eclipse 3.7.0'''   
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'''Eclipse 3.7.0'''   
  
 
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| To follow this tutorial, you must know  
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| To follow this tutorial, you must know  
  
 
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| how to create '''constructors''' in java using '''eclipse'''.
 
| how to create '''constructors''' in java using '''eclipse'''.
  
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| What is '''constructor overloading'''?
 
| What is '''constructor overloading'''?
  
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|  This time we see no error, since we have defined a '''constructor''' without parameter.
 
|  This time we see no error, since we have defined a '''constructor''' without parameter.
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| Then ''' s1 '''dot''' studentDetail'''.
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| Then ''' s1 '''dot''' studentDetail();'''.
  
 
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| Let's see what happens.
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| Let's see what happens.So, in double quotes '''Raju''' comma '''45'''.
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|  04:59
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| So, in double quotes '''Raju''' comma '''45'''.
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|  We see an error which states that "the '''constructor Student with the parameter  String comma int is undefined."'''
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|  We see an error which states that "The constructor Student with the parameter  String comma int is undefined."
  
 
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|So, over here first parameter is '''string''' and the second parameter is '''int'''.
 
|So, over here first parameter is '''string''' and the second parameter is '''int'''.
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| Let us call the '''method'''.
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|Let us call the '''method'''.
  
 
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| We can therefore now define  a '''constructor''' which takes only one parameter.
 
| We can therefore now define  a '''constructor''' which takes only one parameter.
  
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| within curly brackets '''roll_number '''is equal to '''num'''.
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| within curly brackets '''roll_number '''is equal to '''num'''.
  
 
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| So, in the output we see  the '''roll number''' as '''61''' and '''name''' as '''no name.'''
 
| So, in the output we see  the '''roll number''' as '''61''' and '''name''' as '''no name.'''
  
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|   So, in this tutorial, we have learnt:  
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| So, in this tutorial, we have learnt:  
  
 
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| 08:42
 
| 08:42
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|* About the  '''constructor overloading'''
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|About the  '''constructor overloading'''
 
   
 
   
 
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| 08:45
 
| 08:45
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|* To overload '''constructor''' and the use of constructor overloading
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|To overload '''constructor''' and the use of constructor overloading
  
 
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|08:50
 
|08:50
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| For self assessment, create multiple constructors for class '''Employee''' and  '''overload''' the '''constructor.'''  
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| For self assessment, create multiple constructors for class '''Employee''' and  '''overload''' the '''constructor.'''  
  
 
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| 08:58
 
| 08:58
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| To know more about the Spoken Tutorial project,
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| To know more about the Spoken Tutorial project,
  
 
|-
 
|-
 
| 09:00
 
| 09:00
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| watch the video available at [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial].   
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|watch the video available at [http://spoken-tutorial.org/What_is_a_Spoken_Tutorial].   
 +
 
 
|-
 
|-
 
| 09:06
 
| 09:06
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| It summarizes the Spoken Tutorial project.  
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| It summarizes the Spoken Tutorial project.  
  
 
|-
 
|-
 
| 09:09
 
| 09:09
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| If you do not have good bandwidth, you can download and watch it.  
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| If you do not have good bandwidth, you can download and watch it.  
  
 
|-
 
|-
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|   09:12
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| 09:12
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| The Spoken Tutorial project team:  
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| The Spoken Tutorial project team:  
  
 
|-
 
|-
 
| 09:15
 
| 09:15
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| Conducts workshops using spoken tutorials.  
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| Conducts workshops using spoken tutorials.  
  
 
|-
 
|-
 
| 09:17
 
| 09:17
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| Gives certificates to those who pass an online test.  
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| Gives certificates to those who pass an online test.  
  
 
|-
 
|-
 
| 09:20
 
| 09:20
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| For more details, please write to contact@spoken-tutorial.org  
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| For more details, please write to contact@spoken-tutorial.org  
  
 
|-
 
|-
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| 09:26
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| 09:26
 
| 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.  
  
 
|-
 
|-
 
| 09:30
 
| 09:30
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| It is supported by the National Mission on Education through ICT, MHRD, Government of India.  
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| It is supported by the National Mission on Education through ICT, MHRD, Government of India.  
  
 
|-
 
|-
 
| 09:35
 
| 09:35
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| More information on this mission is available at  
+
| More information on this mission is available at [http://spoken-tutorial.org/NMEICT-Intro].
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[http://spoken-tutorial.org/NMEICT-Intro].
+
  
 
|-
 
|-
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| 09:43
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| 09:43
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| This brings us to the end of the tutorial.  
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| This brings us to the end of the tutorial.  
 
   
 
   
 
|-
 
|-
 
| 09:46
 
| 09:46
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| Thanks for joining.
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| Thanks for joining.This is Prathamesh Salunke, signing off.  Jai Hind.  
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+
−
|-
+
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| 09:47
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| This is Prathamesh Salunke, signing off.  Jai Hind.  
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|}
 
|}

Latest revision as of 16:09, 9 March 2017


Time Narration
00:03 Welcome to the Spoken Tutorial on constructor overloading in java.
00:08 In this tutorial, we will learn
00:10 what is constructor overloading
00:13 and to overload constructor.
00:16 Here we are using:

Ubuntu version 11.10 OS Java Development kit 1.6 Eclipse 3.7.0

00:27 To follow this tutorial, you must know
00:30 how to create constructors in java using eclipse.
00:34 If not, for relevant tutorials, please visit our website which is as shown.

http://www.spoken-tutorial.org

00:40 What is constructor overloading?
00:43 Define multiple constructors for a class.
00:46 They must differ in number or types of parameters.
00:50 Let us now see how to overload constructor.
00:54 In eclipse, I have a class Student with two variables and a method.
01:03 Let us first create a parameterized constructor.
01:07 So, type: Student within parentheses int number comma String the_name.
01:26 Within curly brackets, type: roll_number is equal to number.
01:38 And name is equal to the_name
01:46 So, we have a constructor with two parameters.
01:51 Let us call this constructor.
01:53 So, in main method type: new Student parentheses semicolon.
02:03 We see an error, it states that constructor Student is undefined.
02:10 This is simply because we have defined a constructor with two parameters.
02:16 And we are calling a constructor without parameters.
02:22 So, we need to pass arguments.
02:25 So, within parentheses type: 22 comma in double quotes Ram.
02:33 We see that the error is resolved.
02:36 Let us call the method.
02:38 So, before new , type: Student s is equal to new student.
02:45 Now, using the object s we will call the method studentDetail().
02:53 Save the program and Run.
02:58 We see the output: 22 and Ram.
03:03 Now let us define a constructor with no parameter.
03:07 So, type: Student parentheses.
03:12 Within curly brackets roll_number is equal to 0.
03:21 And name is equal to in double quotes hyphen that is no name.
03:30 So, now we can call the constructor with no parameters.
03:35 So, type: Student s1 is equal to new Student parentheses semicolon.
03:47 This time we see no error, since we have defined a constructor without parameter.
03:55 Then s1 dot studentDetail();.
04:01 Save and Run the program.
04:04 So, in the output we see zero and dash when the default constructor is called.
04:11 This is constructor overloading.
04:13 We have two constructors with different parameters.
04:17 Both the constructors obviously have same name.
04:20 So, depending on the type and number of parameters, the constructor is called.
04:26 Let us see the advantage of constructor overloading.
04:30 Suppose, now we call a constructor with two parameters.
04:35 So, type: Student s3= new Student();
04:51 Now within parentheses, suppose I gave the name argument first and then the roll_number.
04:58 Let's see what happens.So, in double quotes Raju comma 45.
05:08 We see an error which states that "The constructor Student with the parameter String comma int is undefined."
05:18 So, let us first define the constructor.
05:22 So, type: Student within parentheses String the_name comma int r_no.
05:42 So, over here first parameter is string and the second parameter is int.
05:52 Then, within curly bracket, roll_number is equal to r_no;
06:05 and name is equal to the_name;
06:15 Save the program.
06:18 Now we see that the error is resolved.
06:22 Let us call the method.
06:24 So, s3 dot studentDetail();
06:29 Save the program and Run.
06:35 So, we see the output 45 and Raju.
06:40 So, here we see that when we call the constructor
06:43 we do not have to worry about the parameters that we are passing.
06:47 This is simply because we have defined multiple constructors with different parameters.
06:54 So, the proper constructor is overloaded.
06:57 We can therefore now define a constructor which takes only one parameter.
07:02 That is roll number.
07:05 So, type: Student within parentheses int num,
07:16 within curly brackets roll_number is equal to num.
07:25 And name is equal to "no name".
07:33 Now, let us call this constructor.
07:43 So, type: Student s4 is equal to new Student;. This time we will pass a single argument. So, let us pass 61.
08:04 Then s4 dot studentDetail();
08:10 Save and Run the program.
08:14 So, in the output we see the roll number as 61 and name as no name.
08:21 As we can see, the proper overloaded constructor is called when new is executed.
08:27 Based upon the parameters specified, the proper constructor is overloaded.
08:33 This is how constructor overloading is done.
08:40 So, in this tutorial, we have learnt:
08:42 About the constructor overloading
08:45 To overload constructor and the use of constructor overloading
08:50 For self assessment, create multiple constructors for class Employee and overload the constructor.
08:58 To know more about the Spoken Tutorial project,
09:00 watch the video available at [1].
09:06 It summarizes the Spoken Tutorial project.
09:09 If you do not have good bandwidth, you can download and watch it.
09:12 The Spoken Tutorial project team:
09:15 Conducts workshops using spoken tutorials.
09:17 Gives certificates to those who pass an online test.
09:20 For more details, please write to contact@spoken-tutorial.org
09:26 Spoken Tutorial Project is a part of the Talk to a Teacher project.
09:30 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
09:35 More information on this mission is available at [2].
09:43 This brings us to the end of the tutorial.
09:46 Thanks for joining.This is Prathamesh Salunke, signing off. Jai Hind.

Contributors and Content Editors

Devisenan, Gaurav, PoojaMoolya, Sandhya.np14, Sneha

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