http://stackoverflow.com/questions/6863182/what-is-the-difference-between-iterator-and-iterable-and-how-to-use-them

Iterator is an interface, which has implementation for iterate over elements. Iterable is an interface which provides Iterator.

An implementation of Iterable is one that provides an Iterator of itself:

public interface Iterable<T>{    Iterator<T> iterator();}

An iterator is a simple way of allowing some to loop through a collection of data without assignment privileges (though with ability to remove).

public interface Iterator<E>{    boolean hasNext();    E next();    void remove();}

Java Iterable Iterator zz