Java tutorial
import java.util.Iterator; import java.util.TreeSet; public class Main { public static void main(String[] args) { TreeSet<Integer> treeadd = new TreeSet<Integer>(); treeadd.add(1); treeadd.add(13); treeadd.add(17); treeadd.add(22); Iterator<Integer> iterator = treeadd.iterator(); while (iterator.hasNext()) { System.out.println(iterator.next()); } } }