Java tutorial
import java.util.Arrays; import java.util.Iterator; import java.util.Set; import java.util.TreeSet; public class MainClass { public static void main(String args[]) throws Exception { String elements[] = { "A", "C", "D", "G", "F" }; Set set = new TreeSet(Arrays.asList(elements)); Iterator iter = set.iterator(); while (iter.hasNext()) { System.out.println(iter.next()); } } }