Ruby | Encapsulation Last Updated : 01 Jan, 2019 Suggest changes Share Like Article Like Report Encapsulation is defined as the wrapping up of data under a single unit. It is the mechanism that binds together code and the data it manipulates. In a different way, encapsulation is a protective shield that prevents the data from being accessed by the code outside this shield. Technically in encapsulation, the variables or data of a class are hidden from any other class and can be accessed only through any member function of own class in which they are declared. Encapsulation can be achieved by declaring all the variables in the class as private and writing public methods in the class to set and get the values of variables. Example: Ruby # Ruby program to illustrate encapsulation #!/usr/bin/ruby class Demoencapsulation def initialize(id, name, addr) # Instance Variables @cust_id = id @cust_name = name @cust_addr = addr end # displaying result def display_details() puts "Customer id: #@cust_id" puts "Customer name: #@cust_name" puts "Customer address: #@cust_addr" end end # Create Objects cust1 = Demoencapsulation .new("1", "Mike", "Wisdom Apartments, Ludhiya") cust2 = Demoencapsulation .new("2", "Jackey", "New Empire road, Khandala") # Call Methods cust1.display_details() cust2.display_details() Output: Customer id: 1 Customer name: Mike Customer address: Wisdom Apartments, Ludhiya Customer id: 2 Customer name: Jackey Customer address: New Empire road, Khandala Explanation: In the above program, the class Demoencapsulation encapsulate the methods of the class. You can only access these methods with the help of objects of the Demoencapsulation class i.e. cust1 and cust2. Advantages of Encapsulation: Data Hiding:The user will have no idea about the inner implementation of the class. It will not be visible to the user that how the class is storing values in the variables. He only knows that we are passing the values to a setter method and variables are getting initialized with that value. Reusability: Encapsulation also improves the re-usability and easy to change with new requirements. Testing code is easy:Encapsulated code is easy to test for unit testing. A ankita_saini Follow Article Tags : Ruby Ruby-OOP Explore Ruby Programming Language 4 min read OverviewRuby For Beginners 3 min read Ruby Programming Language (Introduction) 4 min read Comparison of Java with Other Programming Languages 4 min read Similarities and Differences between Ruby and C language 3 min read Similarities and Differences between Ruby and C++ 3 min read Environment Setup in Ruby 3 min read How to install Ruby on Linux? 2 min read How to install Ruby on Windows? 2 min read Interesting facts about Ruby Programming Language 2 min read BasicsRuby | Keywords 4 min read Ruby | Data Types 3 min read Ruby Basic Syntax 3 min read Hello World in Ruby 2 min read Ruby | Types of Variables 4 min read Global Variable in Ruby 2 min read Comments in Ruby 2 min read Ruby | Ranges 4 min read Ruby Literals 4 min read Ruby Directories 5 min read Ruby | Operators 11 min read Operator Precedence in Ruby 2 min read Operator Overloading in Ruby 5 min read Ruby | Pre-define Variables & Constants 5 min read Ruby | unless Statement and unless Modifier 2 min read Control StatementsRuby | Decision Making (if, if-else, if-else-if, ternary) | Set - 1 3 min read Ruby | Loops (for, while, do..while, until) 5 min read Ruby | Case Statement 3 min read Ruby | Control Flow Alteration 7 min read Ruby Break and Next Statement 2 min read Ruby redo and retry Statement 2 min read BEGIN and END Blocks In Ruby 2 min read File Handling in Ruby 4 min read MethodsRuby | Methods 3 min read Method Visibility in Ruby 3 min read Recursion in Ruby 4 min read Ruby Hook Methods 5 min read Ruby | Range Class Methods 5 min read The Initialize Method in Ruby 2 min read Ruby | Method overriding 2 min read Ruby Date and Time 3 min read OOP ConceptsObject-Oriented Programming in Ruby | Set 1 9 min read Object Oriented Programming in Ruby | Set-2 8 min read Ruby | Class & Object 4 min read Private Classes in Ruby 3 min read Freezing Objects | Ruby 2 min read Ruby | Inheritance 4 min read Polymorphism in Ruby 3 min read Ruby | Constructors 2 min read Ruby | Access Control 8 min read Ruby | Encapsulation 2 min read Ruby Mixins 3 min read Instance Variables in Ruby 3 min read Data Abstraction in Ruby 3 min read Ruby Static Members 3 min read ExceptionsRuby | Exceptions 4 min read Ruby | Exception handling 6 min read Catch and Throw Exception In Ruby 3 min read Raising Exceptions in Ruby 4 min read Ruby | Exception Handling in Threads | Set - 1 2 min read Ruby | Exception Class and its Methods 3 min read Ruby RegexRuby | Regular Expressions 3 min read Ruby Search and Replace 2 min read Ruby ClassesRuby | Float Class 7 min read Ruby | Integer Class 3 min read Ruby | Symbol Class 5 min read Ruby | Struct Class 5 min read Ruby | Dir Class and its methods 3 min read Ruby | MatchData Class 4 min read Ruby ModuleRuby | Module 4 min read Ruby | Comparable Module 3 min read Ruby | Math Module 4 min read Include v/s Extend in Ruby 2 min read My Profile ${profileImgHtml} My Profile Edit Profile My Courses Join Community Transactions Logout Like