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The Java Collections Framework is organized as a hierarchy of interfaces and classes, which provides a unified and consistent way to work with different types of collections. The hierarchy is based on several key interfaces and their subinterfaces, and classes that implement these interfaces. Here's an overview of the collection hierarchy:
Collection Interface:
Collection
interface.Iterable
interface, which allows collections to be iterated using the enhanced for loop (for-each loop).Collection
include:List
: An ordered collection that allows duplicate elements.Set
: A collection that does not allow duplicate elements.Queue
: A collection used to hold elements before processing, following FIFO or priority-based order.List Interface:
List
interface extends the Collection
interface and introduces additional methods to access elements by index and perform positional operations (e.g., add, remove).ArrayList
, LinkedList
, Vector
, etc.Set Interface:
Set
interface extends the Collection
interface and enforces uniqueness of elements. It does not allow duplicate elements.HashSet
, TreeSet
, LinkedHashSet
, etc.Queue Interface:
Queue
interface extends the Collection
interface and represents a collection that supports operations based on the First-In-First-Out (FIFO) principle.LinkedList
, PriorityQueue
, etc.Map Interface:
Map
interface is not a subtype of Collection
, but it is an important part of the Java Collections Framework.HashMap
, TreeMap
, LinkedHashMap
, etc.SortedSet and SortedMap Interfaces:
SortedSet
: An extension of the Set
interface that maintains elements in sorted order.SortedMap
: An extension of the Map
interface that maintains keys in sorted order.NavigableSet and NavigableMap Interfaces:
NavigableSet
: An extension of the SortedSet
interface that provides navigation methods to access elements based on their position in the set.NavigableMap
: An extension of the SortedMap
interface that provides navigation methods to access entries based on their position in the map.The Java Collections Framework provides various classes that implement these interfaces, offering different data structures and implementations to suit specific needs. Developers can choose the appropriate collection type based on their requirements and take advantage of the rich functionality provided by the interfaces and classes in the hierarchy.
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