从HashSet上得到Enum元素

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;

public class GetEnumOverHashSet {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    HashSet hashSet = new HashSet();
        hashSet.add("A");
        hashSet.add("B");
        hashSet.add("D");
        hashSet.add("E");
        hashSet.add("F");
     
        Enumeration e = Collections.enumeration(hashSet);
       
        System.out.println("Enumerating through Java HashSet");
        while(e.hasMoreElements())
          System.out.println(e.nextElement());
}

}
Console：
Enumerating through Java HashSet
A
B
D
E
F