olemus
liik Java klasse, annab mehhanismi teisenduseks primitiivi ja objekti vahel
= the class in Java providing the mechanism to convert primitive into object and object into primitive

ülevaateid
https://en.wikipedia.org/wiki/Primitive_wrapper_class_in_Java
http://www.idc-online.com/technical_references/pdfs/information_technology/Java_Wrapper_Classes.pdf