Saturday, April 10, 2021

Java 16: Stream.toList()

Java 16 introduces a handy new Stream.toList() method which makes it easier to convert a stream into a list. The returned list is unmodifiable and calls to any mutator method will throw an UnsupportedOperationException.

Here is some sample code:

import static*;

// Java 16
stream.toList(); // returns an unmodifiable list

// Other ways to create Lists from Streams:


stream.collect(toCollection(LinkedList::new)); // if you need a specific type of list

stream.collect(toUnmodifiableList());  // introduced in Java 10

    collectingAndThen(toList(), Collections::unmodifiableList)); // pre-Java 10

Related post: Java 10: Collecting a Stream into an Unmodifiable Collection

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