References
Reference NO 1
http://www.javaworld.com/jw-03-1998/jw-03-initialization.html
Reference NO 2
http://stackoverflow.com/questions/15165238/default-initialization-in-java
Reference NO 3
http://stackoverflow.com/questions/11554935/not-sure-about-default-initialization-of-variables-in-java
Reference NO 4
http://www.javapractices.com/topic/TopicAction.do?Id=14
Reference NO 5
http://blog.ajduke.in/2012/03/25/variable-initialization-and-default-values/
Reference NO 6
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
Reference NO 7
http://www.artima.com/objectsandjava/webuscript/InitCleanup1.html
Reference NO 8
http://docstore.mik.ua/orelly/java-ent/jnut/ch03_02.htm