android/guava/src/com/google/common/collect/Iterators.java
public static <T> Enumeration<T> asEnumeration(final Iterator<T> iterator) {
    checkNotNull(iterator);
    return new Enumeration<T>() {
      @Override
      public boolean hasMoreElements() {
        return iterator.hasNext();
      }

      @Override
      public T nextElement() {
        return iterator.next();
      }
    };
  }
public static <T> Enumeration<T> asEnumeration(final Iterator<T> iterator) {
    checkNotNull(iterator);
    return new Enumeration<T>() {
      @Override
      public boolean hasMoreElements() {
        return iterator.hasNext();
      }

      @Override
      public T nextElement() {
        return iterator.next();
      }
    };
  }
Adapts an {@code Iterator} to the {@code Enumeration} interface.

<p>The {@code Iterable} equivalent of this method is either {@link Collections#enumeration} (if
you have a {@link Collection}), or {@code Iterators.asEnumeration(collection.iterator())}.