In the past two decades, object oriented programming has become the dominant programming OOP paradigm used by application developers. Object oriented programming scales very well, from the most trivial of problems to the most complex tasks. It provides a form of abstraction that resonates with techniques people use to solve problems in their everyday life. Although the fundamental features of what the people now call object-oriented programming were invented in the 1960’s, object oriented languages really came to the attention of the computing public in the 1980’s.