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When looking at job openings on-line, I noticed that some openings required knowledge of "core Java". What is core java and how is different from java?
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The Java language forms a superset of Core Java. Core Java is basically a subset of the Java language. One can use Java for mapping various applications on any given embedded system. You cannot make use of Core Java for developing an app for any mobile or embedded systems.
Java is a programming language, whereas Core Java is a computing platform. Java Platform Standard Edition is Core Java, which is also called Java SE. The following are the computing following supported by Java, which also has Core Java as its part: Java SE. Java Standard Edition used to develop desktop applications.
What is Core Java? It is a part of the Java programming language that one can use for developing or creating a general-purpose app. Its main focus is to build such general applications. The J2SE (Java Standard Edition) is known as Core Java.
"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. That is, the underlying way you write Java doesn't change, regardless of the libraries you're using.
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