import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
public class test2 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {


		Set<String> set1  = new HashSet<String>();
		set1.add("one");
		set1.add("two");
		set1.add("three");

		for (String s: set1){
			System.out.println(s);
		}

		Iterator iter = set1.iterator();
		while (iter.hasNext()){
			System.out.println(iter.next());
		}
	}

}