Java8 - Convert Integer array to multiple list of single element

Question

I have an array of which I want to create List with each list have only one element of array. So for array {1,2,3} I want to create 3 List with each having element 1, 2 and 3 respectively.

Have done it using java 7 but wanted to know if it can be solved using java 8 stream, maps etc

Thanks

It’s not very hard, using the basics shown in the documentation: for Integer[], you can use List<List<Integer>> list = Arrays.stream(array).map(Collections::singletonList).collect(Collectors.toList());, for an int[], you only have to change map to mapToObj… — Holger
– Holger, Commented Jan 4, 2017 at 10:20

Robby Cornelissen · Accepted Answer · 2017-01-04 10:21:43Z

8

This will work:

Integer[] array = {1,2,3};

List<List<Integer>> list = Arrays.stream(array)
                                 .map(Collections::singletonList)
                                 .collect(Collectors.toList());

edited Jan 4, 2017 at 10:21

answered Jan 4, 2017 at 10:19

Robby Cornelissen

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1 Comment

Pratik Over a year ago

Thank u, was missing Collections::singletonList part.

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