core java is basically based on standalone type language or we can say starter package which allow you to develop client side application but on the other hand advance is the second step of core java. its allow you to develop server side application or we can say dynamic web application the works on response/request concept. all the advance java application runs on only server machines.core java package start with java.lang* but advance java package start with javax.servelt*. more over we can say core java is taught to first year student and advance java is taught to second year student.