Java Collections - Interfaces

Greetings!

There are number of data structures. To handle varies kind of collections, Collection framework has different interfaces.

• Collection - fundamental interface for most of the collections
• Set  - no duplicates. no order.
• List - ordered collection. contain duplicates. can access using position.
• Queue - typically has first-in-first-out structure.
• Deque - double-ended queue. can behave both as first-in-first-out and last-in-last-out. can insert and remove from both ends.
• SortedSet - maintain sort order
• Map - contains key-value pairs. no duplicates allowed.
• SortedMap - maintain sorted key order

Collection Interface

Map Interface

Iterator

Other than that, there is RandomAccess interface.