Learn here the main principle of Object-oriented programming (OOP).

Object Orientation, Part I: Creating and declaring classes - Constructors

00. Introduction: Classes and Objects, what are they and for what they serve to
01. How to create a Class and declare an Objects in Java
02. Accessing and modifying variables from Classes and Objects
03. Default constructors and with parameters: what they are, what they are for and how to use
      Video lesson: Constructors

Object Orientation, Part II: Setters and Getters - Composition - enum

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