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Message: [QUOTE="Thufir Hawat, post: 599716"] Lew Bloch wrote: [..] characteristics. Why did you select LinkedHashSet over LinkedHashMap? That's not really my question, though. I'm more interested in the use of "Hash" in a collection. A Hash is a sort of unique id for each instance? I believe it to be related to the toString() default method in that hashCode() is so similar: public int hashCode() Returns a hash code value for this enumeration value. The hash code is just this enumeration value's integer value. public String toString() Returns a string value corresponding to this enumeration value. "A map cannot contain duplicate keys" <[URL]http://java.sun.com/docs/books/tutorial/collections/interfaces/index.html[/URL]> That sounds like a Set, to me. Whether one is preferable (in J2ME or J2SE) over the other might be contentious (?), their common quality of "Hashness" is new and interesting to me... [/QUOTE]