We should be aware that java.util.Enumeration itself is a poorly defined interface, it tends to make code dealing with it very messy. Sun have recognised this and are replacing (deprecating?) it in JDK 1.2 with 'Iterator'. See the early access specs (you may need a JDC login) at:
http://java.sun.com/products/jdk/1.2/docs/guide/collections/index.html
I think JOS as a whole would be better off using Iterator and the new Java Collections classes instead of Enumeration and the simple java.util.Vector / Stack / Dictionary classes.