How can I sort an ArrayList of Strings in Java

Question

I have Strings that are put into an ArrayList randomly   private ArrayList lt String gt  teamsName   new ArrayList lt String gt     String   helper     For example   teamsName add helper 0   where helper 0     dragon      teamsName add helper 1   where helper 1     zebra      teamsName add helper 2   where helper 2     tigers     and so forth up to about 150 strings    Given the fact that you cannot control the inputs  i e  string that is coming into the ArrayList is random  zebra or dragon in any order   once the ArrayListis filled with inputs  how do I sort them alphabetically excluding the first one   teamsName 0  is fine  sort teamsName 1 to teamsName size  alphabetically

User · Answer

You might sort the helper   array directly   java util Arrays sort helper  1  helper length     Sorts the array from index 1 to the end  Leaves the first item at index 0 untouched   See Arrays sort Object   a  int fromIndex  int toIndex

User · Answer

You can use TreeSet that automatically order list values   import java util Iterator  import java util TreeSet   public class TreeSetExample        public static void main String   args            System out println  Tree Set Example  n             TreeSet  lt String gt tree   new TreeSet lt String gt             tree add  aaa            tree add  acbbb            tree add  aab            tree add  c            tree add  a             Iterator iterator          iterator   tree iterator             System out print  Tree set data                 Displaying the Tree set data         while  iterator hasNext                 System out print iterator next                                I lastly add  a  but last element must be  c

User · Answer

Check Collections sort method  This automatically sorts your list according to natural ordering  You can apply this method on each sublist you obtain using List subList method   private List lt String gt  teamsName   new ArrayList lt String gt     List lt String gt  subList   teamsName subList 1  teamsName size     Collections sort subList

User · Answer

Take a look at the Collections sort List lt T gt  list    You can simply remove the first element  sort the list and then add it back again

User · Answer

Collections sort teamsName subList 1  teamsName size        The code above will reflect the actual sublist of your original list sorted

[java] How can I sort an ArrayList of Strings in Java?

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