OOP

OOP

1. three pillars

   • Encapsulation
     • private state
       • preventing direct access
   • Inheritance
     • ability of one object to acquire properties of another object
     • reusability
   • Polymorphism
     • each type can provide its own, independent implementation of this interface

2. basic terminologies

   • Object
     • The instance of a class
   • Class
     • This is the model about the capability of what an object can do
   • Method
     • Can modify a class state that would apply across all the instances of the class