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  The Three OO Principle

Introduction to The Three OO Principle

All objects oriented   programming language provide mechanism that  aid to implement. The object oriented model. They are encapsulation, inheritance and polymorphism.

Data Encapsulation

Data encapsulation is the process of localizing data definition hiding  data within an object and allowing access to it only through special  functions know as member functions. So the data is not accessible  to the outside world and only those methods which are rapped within the class can access it. These models provide an interface between  the objects data and the program. The objects are treated like  black boxes  each  performing  a specific task without any concern for  internal  representation  as shown in fig below,

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Data encapsulation is used as security tool as an error handler and for data  validation.  It is  also a good tool for  managing complexity within  the large system.

Advantage of Data Encapsulation

  • The internal representation and implementation details of data and procedures are hidden from the outside world. This reduces the propagation of side effects when changes occur.
  • Data structure and the operations manipulate them are merged in a single named entity, named as class. This facilitates component reuse.
  • Interfaces among  encapsulated objects are simplified. An object that  sends a message need not  be concerned with  the details of internal  data structures. Hence interfacing  is simplified  and the system  coupling  tends to be reduced.

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