Core Java refers to the core or basic features of java like object orientation, inheritance, classes, objects, threads, etc. It is used to create simple java applications.
J2EE stands for Java 2 Enterprise Edition. It uses features like Servlets, JSPs, Struts, Hibernate etc which are all advanced J2EE concepts that are built on top of java.
Java is a object-oriented programming language which is platform neutral. That is unlike C or C++ java programs, Java can be run on any operating system with its JVM.
J2EE is just a specification for server side programs. That is to support internet applications, distributed and uses component model. So that Enterprises use this server side technology in their distributed business.
Since J2EE is just a server side specification, anybody can implement the specification but again using Java.
Hence today we have Custom implemented J2EE servers from Oracle, SUN, IBM and so on..
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