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According to the Java API, Interface Enumeration<E> documentation [API 2011],

An object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to the nextElement method return successive elements of the series.

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Unfortunately, a Vector and an Enumeration may not always work well together. In fact, the Java API [API 2011] recommends, "New implementations should consider using Iterator in preference to Enumeration." Consequently, iterators rather than enumerators should be preferred when examining iterable collections.

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According to the Java API, Interface Iterator<E> documentation [API 2011],

Iterator takes the place of Enumeration in the Java collections framework. 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.

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Using Enumeration when performing remove operations on a vector may cause unexpected program behavior.

Bibliography

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