Encapsulation controls which parts of the class can be accessed from outside.
Encapsulation keeps a lot of functionality within your classes.
class Person def initialize(name) set_name(name) # www. ja v a 2 s . c o m end def name @first_name + ' ' + @last_name end private def set_name(name) first_name, last_name = name.split(/\s+/) set_first_name(first_name) set_last_name(last_name) end def set_first_name(name) @first_name = name end def set_last_name(name) @last_name = name end end
Here, the first name and last name are stored separately within each Person object, in object variables called @first_name and @last_name.
The keyword private has been added.
private tells Ruby that any methods declared in this class from there on should be kept private.
Only code within the object's methods can access those private methods, whereas code outside of the class cannot.