Object Oriented Concepts in Ruby

Define the following object oriented concepts:

  • Class, object (and the difference between the two)
  • Instantiation
  • Method (as opposed to, say, a C function)
  • Static methods and classes
  • Destructor/finalizer
  • Inheritance
  • Encapsulation
  • Multiple inheritance (and give an example)
  • Abstract class
  • Interface/protocol (and different from abstract class)
  • Method overriding
  • Method overloading (and difference from overriding)
  • Polymorphism (without resorting to examples)
  • Method visibility (e.g. public/private/other)