Iterators differ from enumerations in two ways:
Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics.
Method names have been improved.
The bottom line is, both Enumeration and Iterator will give successive elements, but Iterator is improved in such a way so the method names are shorter, and has an additional remove method. Here is a side-by-side comparison:
Enumeration Iterator
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hasMoreElement() hasNext()
nextElement() next()
N/A remove()
