hariprasad

• Oct 30th, 2006

 

collection is a group of objects.its an basic interface to all interfaces.under collection set and list are sub interfaces.These 2 interfaces extends collection interface.

By using collections we can read the elements from the database.

if you want to read only once gofor Iterator and create instance and to make use.

if you want to read more than once gofor ListIterator then use methods like

1.add

2.hasNext

3.next

4.hasPrevious

5.previous

where as in Iterator we cant add elements once instance getting over.

only possible remove operations.

kritika jha

 Profile Answers by kritika jha 

• Jun 13th, 2009

 

Collections are objects that hold other objects that are accessed, placed, and maintained under some set of rules.