Interface Enumeration<E>
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- All Known Subinterfaces:
- NamingEnumeration<T>
- All Known Implementing Classes:
- StringTokenizer
public interface Enumeration<E>An object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to thenextElementmethod 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.
- Since:
- JDK1.0
- See Also:
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Iterator,SequenceInputStream,nextElement(),Hashtable,Hashtable.elements(),Hashtable.keys(),Vector,Vector.elements()
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description booleanhasMoreElements()Tests if this enumeration contains more elements.EnextElement()Returns the next element of this enumeration if this enumeration object has at least one more element to provide.
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Method Detail
hasMoreElements
boolean hasMoreElements()
Tests if this enumeration contains more elements.- Returns:
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trueif and only if this enumeration object contains at least one more element to provide;falseotherwise.
nextElement
E nextElement()
Returns the next element of this enumeration if this enumeration object has at least one more element to provide.- Returns:
- the next element of this enumeration.
- Throws:
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NoSuchElementException- if no more elements exist.
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