Using Collator with Ukrainian language

Question

Please look at my method where I try to implement Collator to sort Objects with a "title" field. Method:

public List<SchoolSubject> findAllByOrderByTitle() {
    List<SchoolSubject> schoolSubjects = subjectRepository.findAllByOrderByTitle();

    Collator uaCollator = Collator.getInstance(new Locale("ua", "UA"));
    uaCollator.setStrength(Collator.SECONDARY);
    schoolSubjects.stream().sorted((s1, s2)->uaCollator.compare(s1.getTitle(), s2.getTitle()));
    return schoolSubjects;
}

It sorts, but not correctly. Letter "i" is put at the very beginning. Whats wrong with it?

Emil Hotkowski · Answer 1 · 2018-10-15T20:40:28.210

3

I think that you should use new Locale("uk", "UA")

Check this site about Internationalization

EDIT:

I think that problem is with the way Ukrainian Alphabet is represented.

https://en.wikipedia.org/wiki/Ukrainian_alphabet#Unicode

According to Wikipedia, 'i' is the lastest letter considering Unicodes. So maybe you sort in descending order instead of ascending?

edited Oct 15 '18 at 20:40

answered Oct 15 '18 at 19:28

Emil Hotkowski

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1

Thanks for correcting me with new Locale("uk", "UA") – Dmytro Manzhula Oct 15 '18 at 21:02

score 3 · Answer 2 · answered Oct 15 '18 at 21:01

Correct code:

public List<SchoolSubject> findAllByOrderByTitle() {
    List<SchoolSubject> schoolSubjects = subjectRepository.findAllByOrderByTitle();

    Collator uaCollator = Collator.getInstance(new Locale("uk", "UA"));
    uaCollator.setStrength(Collator.PRIMARY);
    schoolSubjects.sort((s1, s2)->uaCollator.compare(s1.getTitle(), s2.getTitle()));
    return schoolSubjects;
}

Fixed with new Locale("uk", "UA"), excluded stream() from lambda and it sorted correctly.

Using Collator with Ukrainian language

2 Answers2