PairDemo.java.html

  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  }