[JAVA] This and that of the JDK

Java Development kit JDK is an abbreviation for Java Development kit. The point is the Java development kit.

The JDK includes two features

--Compiler (command javac) --java execution environment (Java Virtual Machine)

JDK package

--Java SE (Standard Edition, usually this) --Java EE (for Enterprise Edition server) --Java RE (Runtime Edition execution environment only) --Java ME (Micro edition for embedding in home appliances, etc.)

Will be added in the future

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