jdk java-based environment to a package and the corresponding standards and internet development toolkit (zip)
Development platform j2se j2ee j2me;
Basic environment:
Virtual machine operating environment
JAVA JDK is the core, including the Java Runtime Environment JRE (Java Runtime Envirnment), a bunch of Java tools (javac / java / jdb, etc.) and Java-based libraries (Java API that is included rt.jar).
①SE (J2SE), standard edition, Standard Edition, is a version we usually use, from JDK 5.0, renamed Java SE.
②EE (J2EE), enterprise edition, Enterprise Edition, using this JDK develop J2EE applications from JDK 5.0, renamed Java EE.
③ME (J2ME), micro edition, mainly for java applications on mobile devices, embedded devices, from JDK 5.0, renamed Java ME.
https://www.cnblogs.com/feng9exe/p/5621859.html
https://www.oracle.com/technetwork/java/javaee/downloads/index.html