An Iterator from TreeSet presents elements in some kind of sorted order. : TreeSet « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. TreeSet

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;

public class MainClass {
  public static void main(String[] argv) {
    Set set = new TreeSet();
    set.add("1");
    set.add("2");
    set.add("3");

    Iterator it = set.iterator();
    while (it.hasNext()) {
      System.out.println(it.next());
    }

  }
}

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