Core Java

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:

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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

Published on Java Code Geeks with permission by Fahd Shariff, partner at our JCG program. See the original article here: Java 16: Stream.toList()

Opinions expressed by Java Code Geeks contributors are their own.

Fahd Shariff

Fahd is a software engineer working in the financial services industry. He is passionate about technology and specializes in Java application development in distributed environments.
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St1mpy
St1mpy
3 years ago

This article is useless:

stream.collect(Collectors.toList());

The article does not mention when or why to use the toList method.

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