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the abstraction technique aim separate the implementation details of a class from its behavior
the freature of one class may be inheritance by more than one class
انا منكتبش في كل حاجة راه نلقا في كم حاجة تلخبط زي هذنا نكتب فيهن محدش يعبا عليا مكتبتش حتا 25% من النظري
means to provide a new implementation for a method in the subclass
if one composition object is destroyed all its parts are also be deleted
