There is no term like Core Java ..SunMicrosystem the vendor of Java never give any title like corejava. SunMicrosystem gives java as its three wings ,1)J2SE-java 2 standard edition--for standalone application /desktop application.
2) J2EE -java2Enterprise Edition --for enterprise application ,webapplication
3) J2ME--java2MicroEdition--for Mobile application
First it lunch J2SE -java 2 standard edition and later on J2EE and J2ME was came in to market.
so, The term "corejava" its created by we people only & later its very became popular term for the J2SE part ..
So,there no difference between Core Java & JAva.
hope this will clear you.
cheer...
omprakash
opbehera@yahoo.in