How do you convert an IntStream to a List in Java?

Converting IntStream to List

Java IntStream represents primitive-type streams of integer values. It provides a comprehensive set of operations, but lacks an out-of-the-box method to convert directly to a list of integers.

Java 8 IntStream to List

To address this issue in Java 8, we need to apply a two-step process:

1. Boxing: IntStream::boxed turns the IntStream into a Stream. This "boxing" operation converts primitive int values to wrapper Integer objects.
2. Collection: Using Collectors.toList(), we can collect the Integer Stream into a List.

For example:

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

Java 16 and Later

Since Java 16, a more concise toList method has been introduced. It provides a direct conversion from IntStream to an unmodifiable list of integers:

<code class="java">theIntStream.boxed().toList()</code>

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