How to Convert an int[] Array to a List in Java Without Loops?

Converting int[] to List in Java without Loops

converting an int[] array into a List in Java without relying on loops has been a challenge for developers. While simple iteration may seem like a straightforward approach, it's not the only option.

Using Streams

Since Java 8, streams have emerged as a powerful tool for data manipulation. To convert an int[] array to a List efficiently, we can leverage streams.

1. Create a Stream: Start by creating a stream from the int[] array using Arrays.stream or IntStream.of.
2. Box primitive values: Convert the int primitive values to Integer objects using IntStream#boxed.
3. Collect into a List: Finally, collect the boxed values into a list using Stream.collect(Collectors.toList()). Or, in Java 16 and later, simplify it to Stream#toList().

Example:

int[] ints = {1,2,3};
List<Integer> list = Arrays.stream(ints).boxed().collect(Collectors.toList()); //Java 8+
List<Integer> list = Arrays.stream(ints).boxed().toList(); //Java 16+

This stream-based approach offers a concise and efficient solution for converting int[] to List without the need for manual iteration.

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