java.util: public interface: Iterator

java.util
public interface: Iterator [javadoc | source]

All Known Implementing Classes:
DescendingItr, SingleIterator, HashIterator, PrinterStateReasonSetIterator, ValueIterator, ValueIterator, ValueIterator, KeyIterator, AbstractItr, SubMapIter, EnumSetIterator, EntryIterator, Itr, MatchingIterator, Itr, ImageReaderIterator, Scanner, ImageWriterIterator, ValueIterator, ValueIterator, EmptyListIterator, SubMapEntryIterator, Iter, SubMapIterator, KeyIterator, ListIterator, SingleIterator, ParameterMapEntrySetIterator, DescendingIterator, Itr, Itr, Enumerator, ListItr, ValueIterator, PrivateEntryIterator, COWIterator, KeyIterator, DescendingIterator, Itr, KeyIterator, HashIterator, LazyIterator, EntryIterator, Itr, ListItr, SubMapKeyIterator, ValueIterator, COWSubListIterator, KeyIterator, EmptyIterator, DescendingSubMapKeyIterator, DeqIterator, SubMapValueIterator, SubMapEntryIterator, EntryIterator, PartialOrderIterator, EnumMapIterator, EntryIterator, EntryIterator, Itr, EntryIterator, ListItr, DescendingKeyIterator, IdentityHashMapIterator, SubMapKeyIterator, Itr, Itr, EventReaderDelegate, Itr, FilterIterator, XMLEventReader, KeyIterator, ListItr, EntryIterator, Itr, KeyIterator, KeyIterator, ImageTranscoderIterator, EntryIterator, EnumSetIterator, ValueIterator, DescendingSubMapEntryIterator, BCSIterator, LinkedHashIterator

An iterator over a collection. {@code 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.

Also see:

Collection

ListIterator

Iterable

author: Josh - Bloch

since: 1.2 -

Method from java.util.Iterator Summary:
hasNext, next, remove

Method from java.util.Iterator Detail:
public boolean hasNext() Returns {@code true} if the iteration has more elements. (In other words, returns {@code true} if #next would return an element rather than throwing an exception.)
public E next() Returns the next element in the iteration.
public void remove() Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to #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.

Method from java.util.Iterator Detail:

 public boolean hasNext()Returns {@code true} if the iteration has more elements.
(In other words, returns {@code true} if #next  would
return an element rather than throwing an exception.)

 public E next()Returns the next element in the iteration.

 public  void remove()Removes from the underlying collection the last element returned
by this iterator (optional operation). This method can be called
only once per call to #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.