Java Language Keywords, https://docs.oracle.com/javase/tutorial/java/nutsandbolts/_keywords.html
Language Basics, https://docs.oracle.com/javase/tutorial/java/nutsandbolts/index.html
"Java Classes and Objects | Wideskills." 2015. 15 Oct. 2016 <http://www.wideskills.com/java-tutorial/java-classes-and-objects>
"Identifiers in Java - Cafe au Lait." 2003. 15 Oct. 2016 <http://www.cafeaulait.org/course/week2/08.html>
"Primitive Types - Wikibooks, open books for an open world." 2011. 15 Oct. 2016 <https://en.wikibooks.org/wiki/Java_Programming/Primitive_Types>
"Instance variable - Wikipedia, the free encyclopedia." 2011. 15 Oct. 2016 <https://en.wikipedia.org/wiki/Instance_variable>
Beth Brown. “A Guide to Programming in Java.” Java 2 Platform Standard Edition 5. Lawrenceville Press 2005.
“Summary of Operators.” Lesson: All About Sockets (The Java™ Tutorials > Custom Networking), docs.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.html.
“Data Type.” Wikipedia, Wikimedia Foundation, 4 Aug. 2018, en.wikipedia.org/wiki/Data_type.
Data structures and data types, https://www.bbc.co.uk/bitesize/guides/zkq7xfr/revision/1