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 java.util.stream.Stream;
import static java.util.stream.Collectors.*;

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

// Other ways to create Lists from Streams:

stream.collect(toList());

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

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

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

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