@GwtCompatible public abstract class AbstractSequentialIterator<T> extends UnmodifiableIterator<T>
Iterator
interface for sequences whose next element can always be derived from the
previous element. Null elements are not supported, nor is the
UnmodifiableIterator.remove() method.
Example:
Iterator<Integer> powersOfTwo =
new AbstractSequentialIterator<Integer>(1) {
protected Integer computeNext(Integer previous) {
return (previous == 1 << 30) ? null : previous * 2;
}
};AbstractLinkedIterator since 8.0)| Modifier | Constructor and Description |
|---|---|
protected |
AbstractSequentialIterator(T firstOrNull)
Creates a new iterator with the given first element, or, if
firstOrNull is null, creates a new empty iterator. |
| Modifier and Type | Method and Description |
|---|---|
protected abstract T |
computeNext(T previous)
Returns the element that follows
previous, or returns null
if no elements remain. |
boolean |
hasNext() |
T |
next() |
removeprotected AbstractSequentialIterator(@Nullable T firstOrNull)
firstOrNull is null, creates a new empty iterator.protected abstract T computeNext(T previous)
previous, or returns null
if no elements remain. This method is invoked during each call to
next() in order to compute the result of a future call to
next().public final boolean hasNext()
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