How to sort arrayList alphabetically with numbers in last in android?

Question

I have an ArrayList and I would like to sort the contents so that anything with English alphabets are sorted first and then anything with numbers and non English characters are sorted last.

For example: A, B , C ... Z, 1 , 2, 3 ... 9, _test1,_2, ...

Currently I only know how to sort items in alphabetical order. Suggestions?

class Comparator implements Comparator<Name> {
    @Override
    public int compare(Name name1, Name name2) {            
        return name1.getName().toLowerCase().compareTo(name2.getName().toLowerCase());
    }
}

check out this answer stackoverflow - multiple sorting creteria. the fourth answer shows an example how to do it... — faceman
– faceman, Commented Feb 26, 2013 at 7:43

tundundun · Accepted Answer · 2013-02-26 08:19:02Z

6

You can use the following implementation of Comparator:

    Comparator<String> comparator = new Comparator<String>() {

        @Override
        public int compare(String lhs, String rhs) {
            boolean lhsStartsWithLetter = Character.isLetter(lhs.charAt(0));
            boolean rhsStartsWithLetter = Character.isLetter(rhs.charAt(0));

            if ((lhsStartsWithLetter && rhsStartsWithLetter) || (!lhsStartsWithLetter && !rhsStartsWithLetter)) {
                // they both start with letters or not-a-letters
                return lhs.compareTo(lhs);
            } else if (lhsStartsWithLetter) {
                // the first string starts with letter and the second one is not
                return -1;
            } else {
                // the second string starts with letter and the first one is not
                return 1;
            }
        }
    };

answered Feb 26, 2013 at 8:19

tundundun

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1 Comment

Gökhan Barış Aker Over a year ago

there is a small mistake on return statement of first if condition. return lhs.compareTo(lhs); needs to be replaced with return lhs.compareTo(rhs);

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