A DESCRIPTION OF THE REQUEST :
* java.util.Collections.EMPTY_SET and results of java.util.Collections.singleton(Object o) should implement the java.util.SortedSet interface.

JUSTIFICATION :
This is one of many RFEs produced from a community discussion at
http://forums.java.net/jive/thread.jspa?threadID=143. Further
justification could typically be found at the given link or off a
thread listed at the given link.