Java Collection - 如何得到一个集合的迭代器

    
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class MainClass {

  public static void main(String[] a) {
    String elements[] = { "A", "B", "C", "D", "E" };
    Set set = new HashSet(Arrays.asList(elements));

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

  }

}