Encapsulation Principle

Encapsulation is one of the 4 main OOP principles.

It protects the class data from access outside the class body.

Members that are supposed to be accessed only in the class are labeled with __ prefix.

Example of encapsulation



  • The private members (__model and __manifactureYear) are supposed to be accessed / modified by functions defined inside the class (in this case getters and setters).
  • Access outside the class is done via the getters and setters.

Example of no encapsulation


All members are accessed outside the class body.