Java: Best way to remove duplicated list in a list [duplicate]

问题

This question already has answers here:

How do I remove repeated elements from ArrayList? (38 answers)

Closed 2 years ago.

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!

回答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));

回答2:

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

来源：https://stackoverflow.com/questions/46531811/java-best-way-to-remove-duplicated-list-in-a-list