Encapsulation

According to this property, objects restrict the visibility of their resources (attributes and methods) to other users. Every object has an interface which plays a very important role. It determines how other objects can interact with it. It is found that the implementation of the object is encapsulated, which means that it is invisible outside the object itself.

Polymorphism

According to this property, identical (identically-named) methods behave differently in different classes. Object-oriented programming contains constructions, which are called interfaces. They enable you to address methods with the same name in different objects. The implementation of the method is specific to a particular class, though the form of address is always the same.

Inheritance

According to this property, one can use an existing class to derive a new class. The data and methods of the super class are inherited by the derived classes. However, they can overwrite existing methods and add new ones.