How to Efficiently Convert a Java 8 IntStream to a List?

Converting a Java 8 IntStream to a List

Efficiently manipulating primitive values is a key aspect of Java programming. IntStream, a specialized stream for int primitives, offers numerous operations. However, converting an IntStream directly to a List of Integer objects can be challenging.

The IntStream::boxed() Approach

The IntStream class provides the boxed() method, which transforms an IntStream into an equivalent Stream of Integer objects. This conversion process is known as "boxing," where primitive values are wrapped into their corresponding object counterparts. Using this method, you can subsequently collect the stream into a List as follows:

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

Java 16's toList() Enhancement

Java 16 introduces an improved method, toList(), which directly converts a stream to an unmodifiable list. This simplifies the conversion process to:

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

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