APCS/08 Hashing Sets _ Maps/02 Sets/SetPractice.java

   import java.util.*;
    public class SetPractice
   {
       public static void main(String[] args)
      {
         Set<String> s = new HashSet<String>();
         s.add("Mary");
         s.add("Joan");
         s.add("Mary");    //duplicate!
         s.add("Dennis");
         s.add("Bob");
         s.add("MaryAnn");
         s.add("Zoe");
         System.out.println("Size:  " + s.size());
         Iterator <String> it = s.iterator(); //iterator   
         while(it.hasNext())
            System.out.print(it.next() + " ");
         System.out.println();
         
         Set<String> t = new TreeSet<String>(s);//from HashSet to TreeSet
         for( String str : t )                //for-each
            System.out.print( str + " " );
         System.out.println();                 //<-----place breakpoint here
         System.out.println(s);    //print any Collection--wow!
         System.out.println(t);
      }
   }
   /******************
	 
    Size:  3
    Joan Mary Dennis 
    Dennis Joan Mary 
    [Joan, Mary, Dennis]
    [Dennis, Joan, Mary]
        
    ************************/