public static class SingleList<MyType> implements List<MyType>, Iterable {
    protected Node<MyType> m_start; // Starting element, initially null.

    public SingleList() {
      m_start = null;
    }

    public Iterator iterator() {
      return new Iterator {
        Node<MyType> cur = m_start;
        public boolean hasNext() {
          return cur.getNext();
        }
        public MyType next() {
          MyType ret = cur.getData();
          cur = cur.getNext();
          return ret;
        }
      };
    }
<..>
}

Compiler:

$ javac  A2.java
A2.java:67: '(' or '[' expected
      return new Iterator {
                          ^