Interface java.util.Enumeration - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Interface java.util.Enumeration

public interface Enumeration

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 v:

     for (Enumeration 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.

See Also:: SequenceInputStream, nextElement, Hashtable, elements, keys, Vector, elements

hasMoreElements(): Tests if this enumeration contains more elements.
nextElement(): Returns the next element of this enumeration.

hasMoreElements

 public abstract boolean hasMoreElements()

Tests if this enumeration contains more elements.

Returns:: true if this enumeration contains more elements; false otherwise.

nextElement

 public abstract Object nextElement()

Returns the next element of this enumeration.

Returns:: the next element of this enumeration.
Throws: NoSuchElementException: if no more elements exist.

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