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  • Class Methods And Object Methods

    @siddharth.sindhi
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    Object Methods:

     

    • Object Methods are thode methods which we have to explicitly define in the class.
    • First we have to create an object of the class and then we call the object methods.

    Example:

     

    1. class Object
    2.   def initialize (name)
    3.     @name=name
    4.   end
    5.   def display
    6.     puts @name
    7.    end
    8. end
    9. obj = Object.new("Rahul")   #creating the object of the class
    10. obj.display
    11.  
    12.  

     

    Output:   Rahul

     


    Class Methods:

     

    • Class Methods are those methods which are implicitly defined in the class itself.
    • We do not have to define the class methods on our own.
    • For class methods we do not have to create objects for them.
    • They are called directly by using the name of the class.

     

    Example:

     

    1. class Apple 
    2.   def self.fruit #self is a class method
    3.     puts "An Apple is an healthy fruit" 
    4.   end 
    5. end 
    6.  
    7. Apple.fruit #Invoking the fruit method by using the name of the class Apple

     

    Output: An Apple is an healthy fruit

     

    • As we can see in that fruit is a method of the Apple class.
    • Self is a class method which is defined on the fruit method definition.
    • Another way of writing the class method is :

     

    1. class Apple
    2.  
    3.   class << self         #Another way of writing the class method
    4.     def fruit
    5.       puts "An Apple is an healthy fruit"
    6.     end
    7.   end
    8. end
    class method
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