Java is one of the most popular language used today. This is an object oriented programming language, which is used to develop Desktop, Web and Mobile applications.
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"Core Java" is Sun's term, used to refer to Java SE, the standard edition and a set of related technologies, like the Java VM, CORBA, et cetera. This is mostly to differentiate from, say, Java ME or Java EE. Also note that they're talking about a set of libraries rather than the programming language. Core Java Online Trainingcontinue reading..