Why do I see that many JDKs used on eclipse for J2EE configuration are J2SE, not J2EE?

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J2EE, Java 2 Platform Enterprise Edition (Java 2 Platform Enterprise Edition)
jdk is java devolop kit - java development kit
j2sdk is the java 2 Software devolop kit-java2 software development kit (Java Development kit (JDK), Java Runtime Environment (JRE) and Java Plug-in)
In fact, jdk and j2sdk are basically the same.
J2SDK is the foundation. The prerequisite for the installation of the following development kits is that J2SDK must be installed first
J2EE-j2eesdk, but most application servers (weblogic jboss, etc.) have built-in j2eesdk.
J2ME——j2me_wireless_toolkit-2_3-windows, a toolkit for mobile phone development
JRE-java runtime envionment-java runtime environment, it is included in jdk
But for users who do not need to develop but just run, it is possible to install jre separately, so sun provides the download of jre.
Swing and JFC (Java Foundation Class) JFC is an early function extension of Sun to JDK, not a public specification of Java. Swing is one of the user interface extension technologies. The latest JAVA2 technology includes JFC technology and does not need to be extended. To put it bluntly, in fact, Sun has incorporated JFC into the JAVA core library. Before using JFC technology, users must add JFC under the premise of the original JRE. Now there is one step less and only JRE is needed.