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- Type Parameters:
E
- the type of elements returned by this iterator
- All Known Subinterfaces:
- ListIterator<E>, XMLEventReader
- All Known Implementing Classes:
- BeanContextSupport.BCSIterator, EventReaderDelegate, Scanner
public interface Iterator<E>
An iterator over a collection.Iterator
takes the place ofEnumeration
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
,Iterable
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Method Summary
Methods Modifier and Type Method and Description boolean
hasNext()
Returnstrue
if the iteration has more elements.E
next()
Returns the next element in the iteration.void
remove()
Removes from the underlying collection the last element returned by this iterator (optional operation).
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Method Detail
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hasNext
boolean hasNext()
Returnstrue
if the iteration has more elements. (In other words, returnstrue
ifnext()
would return an element rather than throwing an exception.)- Returns:
true
if the iteration has more elements
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next
E next()
Returns the next element in the iteration.- Returns:
- the next element in the iteration
- Throws:
NoSuchElementException
- if the iteration has no more elements
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remove
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 tonext()
. 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 theremove
operation is not supported by this iteratorIllegalStateException
- if thenext
method has not yet been called, or theremove
method has already been called after the last call to thenext
method
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