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java.util
Interface
Iterator<E>
Iterator
-
All Known Subinterfaces:
-
ListIterator
-
All Known Implementing Classes:
-
BeanContextSupport.BCSIterator
,
Scanner
-
public interface
Iterator<E>
Iterator
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
.
-
Since:
-
1.2
-
See Also:
-
Collection
,
ListIterator
,
Enumeration
Method Summary
|
boolean |
hasNext
()
Returns
true
if the iteration has more elements. |
E
Object
|
next
()
Returns the next element in the iteration. |
void |
remove
()
Removes from the underlying collection the last element returned by the iterator (optional operation). |
hasNext
boolean hasNext()
-
Returns
true
if the iteration has more elements. (In other words, returns
true
if
next
would return an element rather than throwing an exception.)
-
-
Returns:
-
true
if the iterator has more elements.
next
EObjectnext()
-
Returns the next element in the iteration.
Calling this method repeatedly until the @hasNext() method returns false will return each element in the underlying collection exactly once.
-
-
Returns:
-
the next element in the iteration.
-
Throws:
-
NoSuchElementException
- iteration has no more elements.
remove
void remove()
-
Removes from the underlying collection the last element returned by the 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.
-
-
Throws:
-
UnsupportedOperationException
- if the
remove
operation is not supported by this Iterator.
-
IllegalStateException
- if the
next
method has not yet been called, or the
remove
method has already been called after the last call to the
next
method.