How to Convert an IntStream to a List in Java?

How to Convert an IntStream to a List?

IntStream in Java is a sequence of primitive int-valued elements supporting sequential and parallel bulk operations. IntStream offers various methods to transform or process the elements, but there seems to be a missing option to directly convert an IntStream to a List.

The documentation provides a toArray method to obtain an array of ints, but users may prefer a List. Let's explore how to achieve this conversion:

IntStream::boxed

The IntStream::boxed method transforms an IntStream into a Stream, which can then be collected into a List:

<code class="java">List<Integer> integerList = theIntStream.boxed().collect(Collectors.toList());</code>

Java 16 and Later

Java 16 introduced the toList method, which provides a more concise approach:

<code class="java">List<Integer> integerList = theIntStream.boxed().toList();</code>

This method produces an unmodifiable list. For more information, refer to the Oracle tutorial or the discussion on the toList method in Java 16 .

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