What is the output(generic TreeSet)? : Questions « Utility Classes « SCJP

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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("2");
    set.add(3);
    set.add("1");
    Iterator it = set.iterator();
    while (it.hasNext())
      System.out.print(it.next() + " ");

  }
}