[tpb]References:[/tpb]

 Objects -> https://docs.oracle.com/javase/tutorial/java/concepts/object.html

 Class -> https://docs.oracle.com/javase/tutorial/java/concepts/class.html
 
 OOP fundamental Concept -> https://keremkosaner.wordpress.com/2007/05/03/oop-fundamental-concepts/
 
 Identifier -> https://en.wikipedia.org/wiki/Identifier

 Naming Convention -> https://en.wikipedia.org/wiki/Naming_convention_(programming)
 
 Java package -> https://en.wikipedia.org/wiki/Java_package