How Can I Efficiently Convert Java Iterables to Streams Without Creating Intermediate Lists?

Obtaining Streams from Iterables in Java 8

When working with iterable data, programmers often encounter the challenge of needing to utilize the Java 8 Stream API. However, iterables do not inherently provide a "stream" method.

Problem:

How can we bridge the gap between iterables and streams while avoiding the overhead of converting the iterable to a list?

Solution:

Java 8 provides a convenient solution to this problem. Iterables possess a spliterator() method, which allows us to extract a Spliterator. This spliterator can then be passed to the StreamSupport.stream method to create a stream.

StreamSupport.stream(iterable.spliterator(), false)
    .filter(...)
    .moreStreamOps(...);

This approach offers several advantages over directly using spliteratorUnknownSize:

• Simplicity: It is more concise and easier to read.
• Performance: In scenarios where the iterable is already a collection, it enables the stream to harness a more optimized spliterator, resulting in better performance.

Utilizing this technique, it becomes effortless to transform existing Iterable data into streams and harness the power of the Java 8 Stream API for sophisticated data manipulation.

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