Java tutorial
import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.Date; import java.util.List; public class Main { public static void main(String[] args) { List<String> yearList = new ArrayList<>(25); yearList.add("042015"); yearList.add("052015"); yearList.add("062015"); yearList.add("072015"); yearList.add("082015"); yearList.add("092015"); yearList.add("102010"); yearList.add("112010"); yearList.add("122010"); yearList.add("012015"); yearList.add("022015"); yearList.add("032015"); Collections.sort(yearList, new Comparator<String>() { private DateFormat format = new SimpleDateFormat("MMyyyy"); @Override public int compare(String o1, String o2) { int result = 0; try { Date d1 = format.parse(o1); try { Date d2 = format.parse(o2); result = d1.compareTo(d2); } catch (ParseException ex) { result = -1; } } catch (ParseException ex) { result = 1; } return result; } }); System.out.println(yearList); } }