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Java Source Code / Java Documentation » 6.0 JDK Core » Collections Jar Zip Logging regex » java.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.util.Iterator

Iterator
public interface Iterator (Code)
An iterator over a collection. Iterator takes the place of Enumeration in the Java Collections Framework. Iterators differ from enumerations in two ways:
  • Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics.
  • Method names have been improved.

This interface is a member of the Java Collections Framework.
author:
   Josh Bloch
version:
   1.34, 07/30/07
See Also:   Collection
See Also:   ListIterator
See Also:   Iterable
since:
   1.2





Method Summary
 booleanhasNext()
     Returns true if the iteration has more elements.
 Enext()
     Returns the next element in the iteration.
 voidremove()
     Removes from the underlying collection the last element returned by this iterator (optional operation).



Method Detail
hasNext
boolean hasNext()(Code)
Returns true if the iteration has more elements. (In other words, returns true if Iterator.next would return an element rather than throwing an exception.) true if the iteration has more elements



next
E next()(Code)
Returns the next element in the iteration. the next element in the iteration
throws:
  NoSuchElementException - if the iteration has no more elements



remove
void remove()(Code)
Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to Iterator.next . The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method.
throws:
  UnsupportedOperationException - if the remove operation is not supported by this iterator
throws:
  IllegalStateException - if the next method has notyet been called, or the remove method has alreadybeen called after the last call to the next method



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