• Abstraction
• Encapsulation
• Inheritance
• Polymorphism
• Mixins / Metaclasses
• Dynamic Typing & Duck Typing
• Bibliography

Abstraction

hides internal implementation level details and exposes only the relevant details of the class to the users..

Encapsulation

combines data (fields) and logically-related operations (methods). Abstraction is achieved through encapsulation.

Inheritance

Overriding

Polymorphism

is the characteristic of being able to assign a different meaning or usage to something in different contexts - specifically, to allow an entity such as a variable, a function, or an object to have more than one form. There are several different kinds of polymorphism.

• Compile-time polymorphism - The call for the same method behaves differently based on the provided arguments.
  • Function Overloading - methods with the same name but with different numbers of arguments or types of arguments.
  • Operator Overloading -same operator having different meanings in different context(eg. +)
• Runtime polymorphism
  • Overriding

Mixins / Metaclasses

Dynamic Typing & Duck Typing

Bibliography

• http://www.infoq.com/presentations/It-Is-Possible-to-Do-OOP-in-Java
• http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod