Sorting set of string numbers in java

Question

I need to sort a Set of String\'s which holds number.Ex: [15, 13, 14, 11, 12, 3, 2, 1, 10, 7, 6, 5, 4, 9, 8]. I need to sort it to [1, 2, 3, 4, 5, 6, 7, 8, 9,

Answer 1

you could do as Kai said, and convert your String to integer and compare it

but it is expensive operation,what i suggest is this :

 keyList.sort(new Comparator() {

        @Override
        public int compare(String o1, String o2) {
            if (o1.length() == o2.length()){
                return o1.compareTo(o2);
            }
            return o1.length() - o2.length();
        }
    });

if your numbers has same length, then compare them by using String.compareTo, otherwise, sort them by order, so 1 2 3 will be automatically before 11 22 etc