Object Basics...

The goal of Object-Oriented Programming is to make development easier, quicker and more natural by raising the level of abstraction to the point where applications can be implemented in the same terms in which they are described by the application domain. The main thrust of object-oriented programming is to provide the user with a set of objects that closely reflects the underlying application. The user who needs to develop a financial application could develop it in a financial language with considerably less difficulty. Object-Oriented programming allows the base concepts of the languages to be entended to include ideas closer to those of its application. You can define a new datatype (object) in terms of an existing data type until it appears that the languages directly supports the primitives of the application. The real advantage of using the object-oriented approach is that you can build on what you already have.

Object-Oriented Software Development is a significant departure from the traditional structured approach. The main advantage of an object-oriented approach is the ability to reuse code and develop more maintainable systems in a shorter amount of time. Additionally, object –oriented systems are better designed, more resilient to change, and more reliable, Since they are built from completely tested and debugged classes.

Rather than treat and procedures separately, object-oriented systems link both closely into objects. Events occur when objects respond to messages. The objects themselves determine the response to the messages, allowing the same message to be sent too many objects.

Each object is an instance of a class. Classes are organized hierarchically in a class tree, and subclasses inherit the behavior of their Superclasses. Good Object-Oriented Programming user encapsulation and polymorphism, which, when used in the definition of classes, result in completely reusable abstract data classes. Objects have a lifetime. They are explicitly created and can exist for a period of time that traditionally, has been the duration of the process for which they were created. A file or a database can provide support for objects have a longer lifeline-longer than the duration of the process for which they were created.

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