How to set case insensitive to Set

Question

Set<String> h = new HashSet<>(Arrays.asList("a", "b", "b", "A"));

It will set "a", "b", "A".

But, I want to do case-insensitive.

So, it will give "a", "b"

In, DTO request

public class EmpDto{
    private String empName;
    private Set<String> roles;
}

Like, If I want to get in sort order

    private Set<String> roles;

Is there any predefined implementation or custom implementation required? If custom, give me a head start

There is no inbuilt method...Seems u have to take distinct of the list in lower case .. list.stream().map(String::toLowerCase).distinct().collect(Collectors.toList()) ? — user1428716, Oct 10 '19 at 17:18

score 0 · Answer 1 · edited Oct 11 '19 at 06:30

0

You can try this:

    Set<String> h = Stream.of("a", "b", "b", "A")
            .map(String::toLowerCase)
            .collect(Collectors.toSet());

edited Oct 11 '19 at 06:30

Dino

answered Oct 10 '19 at 17:11

Horatiu Jeflea

That is ok. But, I am expecting that DTO from request – Satish Patro Oct 11 '19 at 05:59
Means, in DTO I can only write Set declaration – Satish Patro Oct 11 '19 at 06:15
this one? Arrays.asList("a", "b", "b", "A") – Horatiu Jeflea Oct 11 '19 at 06:16
Set str = new TreeSet<>(String.CASE_INSENSITIVE_ORDER); – Satish Patro Oct 11 '19 at 06:17
This one worked – Satish Patro Oct 11 '19 at 06:18

1 Answers1