Java is general purpose Object Oriented Programming Language developed by James Gosling and  Patric  Naugton,  at Sun Micro System.  OAK (which is a tree name) is java original name.  In  the  year  1995,  OAK  was  revised  and  developed  software  called JAVA (which is a coffee seed name).

JAVA released to the market in three categories that are J2SE (JAVA 2 Standard Edition), J2EE (JAVA 2 Enterprise Edition) and J2ME (JAVA 2 Micro/Mobile Edition).

J2SE is used for developing standalone application/programs development.

J2EE is used for developing client server applications/programs development.

J2ME is used for developing Mobile Application/programs development.

Java source code file (a file with extension .java) is compiled in to byte code format (.class) that byte code runs on any operating system. So java has slogan WORA (Write Once Run Anywhere).

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