Converting an Iterator to a Stream without Copying
Converting an iterator to a stream is useful for leveraging the powerful capabilities of streams without creating unnecessary copies of the original collection. However, avoiding a copy is crucial for performance reasons.
One effective approach is to leverage Java's Spliterator interface. We can create a Spliterator from the iterator, providing a basis for our stream:
<code class="java">Iterator<String> sourceIterator = Arrays.asList("A", "B", "C").iterator(); Stream<String> targetStream = StreamSupport.stream( Spliterators.spliteratorUnknownSize(sourceIterator, Spliterator.ORDERED), false);</code>
An alternative, which some may find more readable, is to create an Iterable from the iterator using lambdas, since Iterable is a functional interface:
<code class="java">Iterator<String> sourceIterator = Arrays.asList("A", "B", "C").iterator(); Iterable<String> iterable = () -> sourceIterator; Stream<String> targetStream = StreamSupport.stream(iterable.spliterator(), false);</code>
This method bypasses the need for an intermediate list, ensuring efficient conversion of the iterator to a stream.
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