Collection Interfaces question?

[Anto Telvin]

hi ranchers
we have mainly collection interfaces like collection,List,Queue,Set,SortedSet,Map etc.All has so many methods .my question is did these interfaces contain classes it is concrete or abstract classes



thanks

[Maneesh Godbole]

Your question is confusing. The interface doesn't "contain" classes as you put it.
In very simple terms an interface is just like a template. It provides you with all the things it is capable of doing. Now how it is going to achieve it.

All the interfaces you have mentioned have concrete implementations. Some implementations are abstract while some are concrete.
e.g. AbstractList is an abstract implementation of List where as ArrayList is a concrete implementation of List.
If you go through the API you will find a list of all implementations for the given interface.

Does this answer your question? Or did I perhaps misunderstand what you were asking?

[Christophe Verré]

It would be easier to check this page about the Collections Framework.

[Anto Telvin]

thanks