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@GwtCompatible public interface PeekingIterator<E>
An iterator that supports a one-element lookahead while iterating.
Method Summary | |
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E |
next()
Returns the next element in the iteration. |
E |
peek()
Returns the next element in the iteration, without advancing the iteration. |
void |
remove()
Removes from the underlying collection the last element returned by this iterator (optional operation). |
Methods inherited from interface java.util.Iterator |
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hasNext |
Method Detail |
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E peek()
Calls to peek()
should not change the state of the iteration,
except that it may prevent removal of the most recent element via
remove()
.
NoSuchElementException
- if the iteration has no more elements
according to Iterator.hasNext()
E next()
The objects returned by consecutive calls to peek()
then next()
are guaranteed to be equal to each other.
next
in interface Iterator<E>
void remove()
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.
Implementations may or may not support removal when a call to peek()
has occurred since the most recent call to next()
.
remove
in interface Iterator<E>
IllegalStateException
- if there has been a call to peek()
since the most recent call to next()
and this implementation
does not support this sequence of calls (optional)
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