Java Program to insert a value to a SortedSet

import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;
public class Demo {
	public static void main(String[] argv) throws Exception {
		SortedSet<String> set = new TreeSet<String>();
		set.add("T");
		set.add("R");
		set.add("S");
		set.add("Q");
		set.add("V");
		set.add("U");
		set.add("W");
		Iterator<String> i = set.iterator();
		System.out.println("SortedSet elements...");
		while (i.hasNext()) {
			Object ob = i.next();
			System.out.println(ob.toString());
		}
		set.add("Z");
		set.add("Y");
		i = set.iterator();
		System.out.println("Updated SortedSet elements...");
		while (i.hasNext()) {
			Object ob = i.next();
			System.out.println(ob.toString());
		}
	}
}