Generics, for loop, autoboxing of JDK 5

package test50;

import java.util.*;
/**
*  Test  1. generics; 2. new for loop;  3. autoboxing
*  Task: count frequency of the words appearing in array
*/
public class Autoboxing {

   public static void main(String[] args) {
       String[] ars = {"as", "ae", "ac", "ad", "as", "ac"};
       Map< String, Integer> m = new TreeMap<String, Integer>(); //1

       for (String word : ars) {  //2
         Integer freq = m.get(word);
         int ff = freq == null ? 1 : freq + 1;
         m.put(word, ff); //3
       }

       System.out.println(m);
   }
}
//output: {ac=2, ad=1, ae=1, as=2}