Blocks of OOP

- Classes are essentially user-defined data types.

- Objects are instances of a class.

- Methods represent behaviors. Methods perform actions; methods might return information about an object or update an object’s data. The method’s code is defined in the class definition.

- Attributes are the information that is stored. Attributes are defined in the Class template.

Four Principles of OOP

The four pillars of object-oriented programming are:

- Inheritance: child classes inherit data and behaviors from the parent class

- Encapsulation: containing information in an object, exposing only selected information

- Abstraction: only exposing high-level public methods for accessing an object

- Polymorphism: many methods can do the same task

Encapsulation requires defining some fields as private and some as public.

Private/ Internal interface: methods and properties accessible from other methods of the same class.

Public / External Interface: methods and properties accessible from outside the class.

Method Overriding

Runtime polymorphism uses method overriding. In method overriding, a child class can implement differently than its parent class.

Method Overloading

Compile Time polymorphism uses method overloading. Methods or functions may have the same name but a different number of parameters passed into the method call. Different results may occur depending on the number of parameters passed in.

Languages with OOP

• Java
• JavaScript
• Python
• C++
• C#
• 
  

Resources: educative https://www.educative.io/blog/object-oriented-programming