ayasha ayasha - 5 months ago 19
Java Question

Collator Locale German - How to sort accented letters only after the normal ones

i have used Collator to sort an array of objects. But I found out that it treats accented letters like normal ones:


instead i would like to have this


the accented letter should be placed right after the normal ones. That is also for o/ö and u/ü.

Collator collator = Collator.getInstance(Locale.GERMAN);
private void sortDocumentiByCategoria(final Collator collator, List<ListDocumenti> listDocumenti) {
Collections.sort(listDocumenti, new Comparator<ListDocumenti>(){
public int compare(ListDocumenti arg0, ListDocumenti arg1) {
return collator.compare(arg0.getDescrizione(), arg1.getDescrizione());

Answer Source

It took awhile, but I figured it out. Here you go!

public static void main(String[] args) throws IOException {
    List<String> list = Arrays.asList("Änderung", "Aktivierung", "Auszahlung", "Bar");

    Collections.sort(list, createCollator());


private static RuleBasedCollator createCollator() {
    String german = "" +
                    "= '-',''' " +
                    "< A< a< ä< Ä< B,b< C,c< D,d< E,e< F,f< G,g< H,h< I,i< J,j" +
                    "< K,k< L,l< M,m< N,n< O< o< Ö< ö< P,p< Q,q< R,r< S,s< T,t" +
                    "< U< u< Ü< ü< V,v< W,w< X,x< Y,y< Z,z" +
                    "& ss=ß";

    try {
        return new RuleBasedCollator(german);
    } catch (ParseException e) {
        throw new RuntimeException(e);

Testing it yields the following:

>> [Aktivierung, Auszahlung, Änderung, Bar]