1  public class PairDemo

  2  {

  3     public static void main(String[] args)

  4     {

  5        String[] names = { "Tom", "Diana", "Harry" };

  6        Pair<String, Integer> result = firstContaining(names, "a");

  7        System.out.println(result.getFirst());

  8        System.out.println("Expected: Diana");

  9        System.out.println(result.getSecond());

 10        System.out.println("Expected: 1");

 11     }

 12  

 13     /**

 14        Gets the first String containing a given string, together 

 15        with its index.

 16        @param strings an array of strings

 17        @param sub a string

 18        @return a pair (strings[i], i) where strings[i] is the first 

 19        strings[i] containing str, or a pair (null, -1) if there is no

 20        match.

 21     */

 22     public static Pair<String, Integer> firstContaining(

 23        String[] strings, String sub)

 24     {

 25        for (int i = 0; i < strings.length; i++)

 26        {

 27           if (strings[i].contains(sub))

 28           {

 29              return new Pair<String, Integer>(strings[i], i);

 30           }

 31        }

 32        return new Pair<String, Integer>(null, -1);

 33     }

 34  }