Container exercise 31,32,  * Exercise 32: (2) Following the example of MultilterableClass, add reversed( ) and
randomized( ) methods to NonCollectionSequence.java, as well as making
NonCollectionSequence implement Iterable, and show that all the approaches work in
foreach statements.
* 
* When use foreach, if a class implements the Iterable, it can use foreach,
* if a method return Iterable, this method can use foreach