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

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| In this tutorial we will learn  
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| In this tutorial we will learn:
  
 
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| What is '''method overloading.'''
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|* What is '''method overloading.'''
  
 
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|And to overload '''method.'''
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|* And to overload '''method.'''
  
 
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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
 
* Ubuntu version 11.10  OS
 
* Java Development kit 1.6
 
* Java Development kit 1.6
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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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|To '''overload''' '''constructor''' in '''java''' using '''eclipse'''.
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|to '''overload''' '''constructor''' in java using '''eclipse'''.
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+
  
 
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|  00:32  
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|If not, for relevant tutorials please visit our website which is as shown,
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|If not, for relevant tutorials, please visit our website which is as shown.
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http://www.spoken-tutorial.org  
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('''http'''://'''www.spoken'''-'''tutorial.org''')
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| Define two or more methods with same name within a class.
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| Define two or more '''method'''s with same name within a '''class'''.
  
 
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|  Let us now see how to overload '''method'''.
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|  Let us now see how to '''overload''' a '''method'''.
  
 
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|Inside the class  we will  declare two integer variables.
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|Inside the '''class''', we will  declare two integer variables.
  
 
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|So type '''''int''''' '''''a''''' ''is equalto '''10''' and '''int''' '''b''' is equalto '''5''.'''
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|So, type: '''int''' '''a''' is equal to '''10''' and '''int''' '''b''' is equal to '''5.'''
  
 
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|  Let us create a method to add these two integers.
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|  Let us create a '''method''' to add these two integers.
  
 
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|So type''''' void add '''parentheses''.
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|So, type: ''' void add '''parentheses.
  
 
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|''Within curly brackets type '''System''' dot '''out''' dot '''println'''.''
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|Within curly brackets, type: '''System''' dot '''out''' dot '''println'''.
  
 
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|''Inside  parentheses '''a+b'''.''
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|Inside  parentheses '''a+b'''.
  
 
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|So this method will give us the sum of two integer variables.
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|So, this method will give us the sum of two integer variables.
  
 
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|  Let us create another method which takes two parameter.
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|  Let us create another '''method''' which takes two parameters.
 
   
 
   
 
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|So type '''''void addTwoNumbers'''''.
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|So, type: '''void addTwoNumbers'''.
 
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|''Within parentheses '''int''' '''num1''' comma '''int''' '''num2.'''''
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|Within parentheses '''int''' '''num1''' comma '''int''' '''num2.'''
  
 
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| 02:14  
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|Then within curly brackets '''System''' dot '''out''' dot '''println''' '''num1''' plus '''num2.'''''  
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|Then, within curly brackets '''System''' dot '''out''' dot '''println''' '''num1''' plus '''num2.'''  
  
 
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|  02:35
 
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|So this method will give us the sum of two  values that are passed as argument to this methods.
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|So, this method will give us the sum of two  values that are passed as arguments to this '''method'''.
 
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|  02:44
 
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|  Let us create an object of the class and call the methods.
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|  Let us create an '''object''' of the '''class''' and call the '''method'''s.
  
 
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|So in  the  '''Main''' method  type '''''Addition  i.e the class name ''''' '''''obj''' is equalto '''new''' '''Addition''' parentheses'' semicolon.
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|So, in  the  '''Main''' method  type: '''Addition''' i.e the class name '''obj''' is equal to '''new''' '''Addition''' parentheses semicolon.
  
 
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|And '''''Obj.addTwonumbers'''  within parentheses.''
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|And '''Obj.addTwonumbers'''  within parentheses.
  
 
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|So type '''2.5''' comma and an  integer '''3'''.
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|So, type '''2.5''' comma and an  integer '''3'''.
  
 
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| 03:45
 
| 03:45
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|  We get an error which states that ,''' the method addTwoNumbers  int comma int  of the  class '''addition is not applicable for the argument '''double comma int'''.
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|  We get an error which states that: ''' the method addTwoNumbers  int comma int  of the  class addition is not applicable for the arguments double comma int'''.
  
 
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Revision as of 22:37, 1 April 2015


Time Narration
00:01 Welcome to the Spoken Tutorial on method overloading in java.
00:06 In this tutorial we will learn:
00:08 * What is method overloading.
00:10 * And to overload method.
00:13 Here we are using:
  • Ubuntu version 11.10 OS
  • Java Development kit 1.6
  • And Eclipse 3.7.0
00:24 To follow this tutorial, you must know
00:26 how to create methods and
00:29 to overload constructor in java using eclipse.
00:32 If not, for relevant tutorials, please visit our website which is as shown.

http://www.spoken-tutorial.org

00:39 What is method overloading?
00:42 Define two or more methods with same name within a class.
00:46 They must differ in number or types of parameters.
00:50 These methods are called overloaded methods.
00:54 The process is called method overloading.
00:57 Let us now see how to overload a method.
01:00 In eclipse, I have a class Addition.
01:06 Inside the class, we will declare two integer variables.
01:10 So, type: int a is equal to 10 and int b is equal to 5.
01:19 Let us create a method to add these two integers.
01:23 So, type: void add parentheses.
01:30 Within curly brackets, type: System dot out dot println.
01:40 Inside parentheses a+b.
01:44 So, this method will give us the sum of two integer variables.
01:50 Let us create another method which takes two parameters.
01:55 So, type: void addTwoNumbers.
02:04 Within parentheses int num1 comma int num2.
02:14 Then, within curly brackets System dot out dot println num1 plus num2.
02:35 So, this method will give us the sum of two values that are passed as arguments to this method.
02:44 Let us create an object of the class and call the methods.
02:49 So, in the Main method type: Addition i.e the class name obj is equal to new Addition parentheses semicolon.
03:13 Then Obj.add
03:18 And Obj.addTwonumbers within parentheses.
03:31 we will pass two arguments.
03:33 Suppose if we pass floating point values.
03:37 So, type 2.5 comma and an integer 3.
03:45 We get an error which states that: the method addTwoNumbers int comma int of the class addition is not applicable for the arguments double comma int.
03:57 So what we do is in the method instead of int we will give double.
04:06 So replace intby double. Save the file
04:12 we see that the error is resolved.
04:17 we also know that Java automatically i.e. implicitly coverts int into double.
04:24 So here we can pass an integer arguments as well.
04:28 Now Save and Run the program
04:32 In the output we see the sum of two integers variables,
04:37 And the sum of two numeric arguments that we passed.
04:43 Now we see that both the method performs same operation.
04:50 The difference is that the first method has no parameter. While the second method has parameters.
05:00 So in such case java provides us with method overloading.
05:05 So what we do is give same name to both the methods.
05:09 So replace addTwoNumbers with add also change here.
05:29 We will define one more method with same opearation.
05:33 So type void add.
05:38 AndWithin parentheses int n1 comma int n2 comma int n3.
05:51 So we have given three parameters.
05:54 Then Within curly brackets System dot out dot println.
06:03 Within parentheses n1 plus n2 plus n3.
06:11 So this method will give sum of three numbers.
06:17 let us call this method.
06:19 So type obj dot add 1 comma 5 comma 4
06:35 Save' and Run
0639 In the output we see the sum of three number i.e10
06:47 So Java compiler overloads the proper method depending on the parameters.
06:52 It checks the number and type of parameter passed
06:57 So as a programmer we dont have worry about the method name.
07:01 Nor even the type or number of argument we passed.
07:05 We can create one more method which append strings.
07:11 So we will create one more overload method
07:15 type void add String s1 comma String s2.
07:29 Within curly brackets System dot out dot println.
07:41 Within parentheses s1 plus s2.
07:45 And we will call this method.
07:50 So type obj dot add.
07:55 Within parentheses in double quotes Hello comma in double quotes space World.
08:07 Now Save and Run the program.
08:12 So in the output we see Hello space World.
08:16 So the add method with two string arguments, appends the string.
08:21 Suppose now we declare add method with return type.
08:27 So type int add parentheses no parameter and curly brackets.
08:40 We get an error it states that duplicate method add in type addition
08:48 This is because we have already declared a method add with no parameters.
08:54 So remember that to overload method the parameters must differ.
08:58 Having different return types will not overload the method.
09:03 So remove this method and Save the file.
09:09 This is how method overloading is done in java
09:16 So in this tutorial we learnt,
09:18 About method overloading.
09:20 To overload method.
09:22 And advantage of method overloading.
09:25 For self assessment, create a method subtract that subtracts number
09:31 Overload it.
09:33 To know more about the Spoken Tutorial Project
09:36 Watch the video available at http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
09:42 It summarizes the Spoken Tutorial project
09:45 If you do not have good bandwidth, you can download and watch it
09:48 The Spoken Tutorial Project Team
09:50 Conducts workshops using spoken tutorials
09:52 Give certificates to those who pass an online test
09:56 For more details, please write to contact@spoken-tutorial.org
10:01 Spoken Tutorial Project is a part of the Talk to a Teacher project
10:05 It is supported by the National Mission on Education through ICT, MHRD, Government of India
10:11 More information on this Mission is available at 
http://spoken-tutorial.org/NMEICT-Intro
10:19 We have come to the end of this tutorial.
10:21 Thanks for joining.
10:22 This is Prathamesh Salunke signing off. Jai Hind.

Contributors and Content Editors

Devisenan, Gaurav, Jyotisolanki, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha

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