| Known Indirect Subclasses |
Base interface for streams, which are sequences of elements supporting
sequential and parallel aggregate operations. The following example
illustrates an aggregate operation using the stream types Stream
and IntStream, computing the sum of the weights of the red widgets:
int sum = widgets.stream()
.filter(w -> w.getColor() == RED)
.mapToInt(w -> w.getWeight())
.sum();
Stream and the package documentation
for java.util.stream for additional
specification of streams, stream operations, stream pipelines, and
parallelism, which governs the behavior of all stream types.
Public Method Summary
| abstract void |
close()
Closes this stream, causing all close handlers for this stream pipeline
to be called.
|
| abstract boolean |
isParallel()
Returns whether this stream, if a terminal operation were to be executed,
would execute in parallel.
|
| abstract Iterator<T> |
iterator()
Returns an iterator for the elements of this stream.
|
| abstract S | |
| abstract S |
parallel()
Returns an equivalent stream that is parallel.
|
| abstract S |
sequential()
Returns an equivalent stream that is sequential.
|
| abstract Spliterator<T> |
spliterator()
Returns a spliterator for the elements of this stream.
|
| abstract S |
Inherited Method Summary
Public Methods
public abstract void close ()
Closes this stream, causing all close handlers for this stream pipeline to be called.
See Also
public abstract boolean isParallel ()
Returns whether this stream, if a terminal operation were to be executed, would execute in parallel. Calling this method after invoking an terminal stream operation method may yield unpredictable results.
Returns
trueif this stream would execute in parallel if executed
public abstract Iterator<T> iterator ()
Returns an iterator for the elements of this stream.
This is a terminal operation.
Returns
- the element iterator for this stream
public abstract S onClose (Runnable closeHandler)
Returns an equivalent stream with an additional close handler. Close
handlers are run when the close() method
is called on the stream, and are executed in the order they were
added. All close handlers are run, even if earlier close handlers throw
exceptions. If any close handler throws an exception, the first
exception thrown will be relayed to the caller of close(), with
any remaining exceptions added to that exception as suppressed exceptions
(unless one of the remaining exceptions is the same exception as the
first exception, since an exception cannot suppress itself.) May
return itself.
This is an intermediate operation.
Parameters
| closeHandler | A task to execute when the stream is closed |
|---|
Returns
- a stream with a handler that is run if the stream is closed
public abstract S parallel ()
Returns an equivalent stream that is parallel. May return itself, either because the stream was already parallel, or because the underlying stream state was modified to be parallel.
This is an intermediate operation.
Returns
- a parallel stream
public abstract S sequential ()
Returns an equivalent stream that is sequential. May return itself, either because the stream was already sequential, or because the underlying stream state was modified to be sequential.
This is an intermediate operation.
Returns
- a sequential stream
public abstract Spliterator<T> spliterator ()
Returns a spliterator for the elements of this stream.
This is a terminal operation.
Returns
- the element spliterator for this stream
public abstract S unordered ()
Returns an equivalent stream that is unordered. May return itself, either because the stream was already unordered, or because the underlying stream state was modified to be unordered.
This is an intermediate operation.
Returns
- an unordered stream