1  import java.util.Collection;

  2  import java.util.ArrayList;

  3  import java.util.TreeSet;

  4  

  5  /**

  6     This program demonstrates classes from the Java collections framework.

  7  */

  8  public class CollectionsDemo

  9  {

 10     public static void main(String[] args)

 11     {

 12        System.out.println("Working with an ArrayList");

 13        workWith(new ArrayList<String>());

 14        System.out.println("Working with a TreeSet");

 15        workWith(new TreeSet<String>());

 16     }

 17  

 18     /**

 19        Shows how to work with a collection of strings.

 20        @param coll a collection from the Java collections framework

 21     */

 22     public static void workWith(Collection<String> coll)

 23     {

 24        coll.add("Harry");

 25        coll.add("Sally");

 26        coll.add("Fred");

 27        coll.add("Wilma");

 28        coll.add("Harry");

 29        System.out.println(coll);

 30        System.out.print("Removing Harry and Tom: ");

 31        System.out.print(coll.remove("Harry") + " ");

 32        System.out.println(coll.remove("Tom"));

 33        System.out.print("Looking for Harry and Sally: ");

 34        System.out.print(coll.contains("Harry") + " ");

 35        System.out.println(coll.contains("Sally"));

 36        for (String s : coll) 

 37        {

 38           System.out.println(s);

 39        }

 40     }

 41  }