Enumeration (Java Platform SE 8 ) (original) (raw)

• All Known Subinterfaces:
  NamingEnumeration
  All Known Implementing Classes:
  StringTokenizer

public interface Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to thenextElement 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 aSequenceInputStream.
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:
Iterator, SequenceInputStream, nextElement(), Hashtable, Hashtable.elements(), Hashtable.keys(), Vector, Vector.elements()

• • Method Summary

  All Methods Instance Methods Abstract Methods

  Modifier and Type	Method	Description
  boolean	hasMoreElements()	Tests if this enumeration contains more elements.
  E	nextElement()	Returns the next element of this enumeration if this enumeration object has at least one more element to provide.

• • Method Detail

     * #### hasMoreElements  
     boolean hasMoreElements()  
     Tests if this enumeration contains more elements.  
     Returns:  
     `true` if and only if this enumeration object contains at least one more element to provide;`false` otherwise.  
     * #### nextElement  
     [E](../../java/util/Enumeration.html "type parameter in Enumeration") 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:  
     `[NoSuchElementException](../../java/util/NoSuchElementException.html "class in java.util")` \- if no more elements exist.

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