The Enumeration interface defines the methods by which you can enumerate (obtain one at a time) the elements in a collection of objects. This legacy interface has been superseded by Iterator. Although not deprecated, Enumeration is considered obsolete for new code. However, it is used by several methods defined by the legacy classes (such as Vector and Properties), is used by several other API classes, and is currently in widespread use in application code. Because it is still in use, it was retrofitted for generics by JDK 5. It has this declaration:
interface Enumeration<E>
where E specifies the type of element being enumerated.
Enumeration specifies the following two methods:
boolean hasMoreElements( )
E nextElement( )
When implemented, hasMoreElements( ) must return true while there are still more elements to extract, and false when all the elements have been enumerated. nextElement( ) returns the next object in the enumeration