yt
iterator
this  write by youyou,IT
write by youyou jia
test
write by yiting  for interface iterable and collection
update the collection.java for the function contains();
write the intefate List,but there two function relate to ListIterator is
need to write.
test
ListIterator is an particular Iterator for List .Add some function for
the new interface.
Queue.java  write by youyou 2014/5/15
Merge branch 'master' of https://github.com/yiting1122/yyyy.git
Queue.java and Deque  write by youyou
update deque.java and queue.java

write by youyou 2014/5/16
Merge branch 'master' of https://github.com/yiting1122/yyyy.git
finish the List interface and ListIterator interface，add some functions。
some error to changes，about one function about
	“public E[] toArry(E[] a) ” in collectioon ，i have change to 
	public <T> T[] toArry(T[] a)
update iterator  because the （for（a：A）｛｝） function must need the
interface implements java。lang。iterable
AbstractCollection。java is an abstract class,some defalut implement of
some functions
abstarctCollection.java
abstratList is not over。，。。。there something to do