Java: Best way to remove duplicated list in a list

Question

I have a list of list:

List<List<Integer>> myList = new ArrayList<>();

What would be the best way to remove the duplicated list in myList?

For example, in the following list of list:

[[-1,0,1],[-1,-1,2],[-1,0,1]]

I would like to reduce it to:

[[-1,0,1],[-1,-1,2]]

Thanks!

Convert `List>` to `Set>` – Nikolas Charalambidis Oct 02 '17 at 18:50 — Nikolas Charalambidis, Oct 02 '17 at 18:50
`new ArrayList<>(new LinkedHashSet<>(myList))`. – Andy Turner Oct 02 '17 at 18:50 — Andy Turner, Oct 02 '17 at 18:50
`myList.stream().distinct().collect(Collectors.toList())` – shmosel Oct 02 '17 at 19:02 — shmosel, Oct 02 '17 at 19:02

score 1 · Answer 1 · answered Oct 02 '17 at 18:52

1

The easiest way is to copy it into an order-preserving set (or, more generally, any kind of set, if you don't care about the ordering), and then back into the list:

myList = new ArrayList<>(new LinkedHashSet<>(myList));

answered Oct 02 '17 at 18:52

Andy Turner

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I cant tell you how much this solution has helped me. Thanks. – Fakipo May 23 '21 at 23:48

score 0 · Answer 2 · answered Oct 02 '17 at 18:53

0

Use a Set instead of a list. Sets do not allow duplicates. What is the difference between Set and List?

answered Oct 02 '17 at 18:53

Tom O.

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Java: Best way to remove duplicated list in a list

2 Answers2

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