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Enumeration
public
interface
Enumeration
| java.util.Enumeration<E> |
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.
For example, to print all elements of a Vector<E> v:
for (Enumeration<E> e = v.elements(); e.hasMoreElements();)
System.out.println(e.nextElement());
Methods are provided to enumerate through the elements of a
vector, the keys of a hashtable, and the values in a hashtable.
Enumerations are also used to specify the input streams to a
SequenceInputStream.
NOTE: The functionality of this interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration.
See also:
Summary
Public methods | |
|---|---|
abstract
boolean
|
hasMoreElements()
Tests if this enumeration contains more elements. |
abstract
E
|
nextElement()
Returns the next element of this enumeration if this enumeration object has at least one more element to provide. |
Public methods
hasMoreElements
public abstract boolean hasMoreElements ()
Tests if this enumeration contains more elements.
| Returns | |
|---|---|
boolean |
true if and only if this enumeration object
contains at least one more element to provide;
false otherwise. |
nextElement
public abstract E nextElement ()
Returns the next element of this enumeration if this enumeration object has at least one more element to provide.
| Returns | |
|---|---|
E |
the next element of this enumeration. |
| Throws | |
|---|---|
NoSuchElementException |
if no more elements exist. |