Java collections of objects are any set of individual objects shown as one entity. Java features a distinct framework called the "Collection Framework," established in JDK 1.2, that contains all Java collection classes and interfaces.
Two important "root" interfaces of Java collection classes are the Map interface (java.util.Map) and the Collection interface (java.util.Collection). Java Collections are the one-stop answers for all the data-handling tasks, including storing, finding, organizing, insertion, deletion, and data updating. While a Java Collection Framework offers several interfaces and classes, Java collections react as a single entity. To learn practical application of Java collection, enroll in Java training in Noida.
Java Collection
A Java Collection is a specified architecture able to store a set of items and act as a single entity, like an object or a group.
Knowing precisely what Java Collections is today will help you to comprehend the term Java Collections Framework.
What is a Framework in Java?
A framework is an assembly of classes and interfaces offering a ready-made architecture. Defining a framework is not necessary to apply a new feature or a class. Still, an ideal object-oriented design always consists of a framework comprising a set of classes so that every class executes the same type of work.
Java Collection Interface
Set Interface
A set is an unordered collection of items from which duplicated values cannot be kept. This collection is utilized when we want to keep just the distinctive things and avoid object duplication. Different classes like HashSet, TreeSet, LinkedHashSet, etc. apply this set interface. We may create a set object with any of these classes, as all the subclasses follow the same set.
List Interface
This interface is meant for the data of the list kind, from which we can keep every ordered grouping of the things. Duplicate data can thus also be present in it. Different classes, including ArrayList, Vector, Stack, etc., handle this list interface. We can create a list object with any of the subclasses, as all of them apply to the list.
Queue Interface
Like a real-world queue line, a queue interface preserves the FIFO (First In, First Out) sequence as suggested by the name. This interface is meant to store all the elements where the arrangement of the components counts. For instance, the tickets are sold on a first-come, first-served basis every time we try to reserve one. Consequently, the individual whose request shows first in line gets the ticket. Priority queues, arrays deques, etc. are among the several types. We can create a queue object with any of these subclasses, as all of them apply to the queue.
Deque Interface
The difference in the queue data structure is really small. A deque, sometimes referred to as a double-ended queue, is a data structure whereby elements may be added and removed from both ends of the queue. This expands the queue interface. ArrayDeque is the class designed with this interface. We may create a deque object with this class, as the ArrayDeque class uses the Deque interface.
Map Interface
A map is a data structure supporting the key-value pair meant for data mapping. Although the same key cannot have several mappings, hence this interface does not support duplicate keys, still, it allows duplicate values in distinct keys. If we wish to operate based on the key and have data, a map is helpful. Different classes like HashMap, TreeMap, etc. build this map interface. We can create a map object with any one of these classes since all the subclasses apply the map.
SortedSet Interface
This interface shares a great resemblance with the set interface. The sole variation is that this interface features additional features meant to preserve the element ordering. Designed to manage the data that requires sorting, the sorted set interface stretches the set interface. TreeSet is the course using this interface. This class uses the SortedSet; hence, we can create a SortedSet object right now.
SortedMap Interface
A sorted map interface preserves element mappings in ascending critical sequence. Sorted Map is Sorted Set's Map equivalent.
Iterable Interface
The whole collecting framework's root interface is this one. The iterative interface is expanded by the collecting interface. All the interfaces and classes thus fundamentally use this interface. This interface mostly serves as an iterator for the collections. Consequently, this interface has just one abstract method—the iterator.
Collection Interface
Implementing all the classes in the collection framework, this interface expands the iterable interface. Every collection has things like putting the data into the collection, removing the data, clearing the data, etc.; this interface provides all the fundamental methods of every collection. This interface implements all these techniques since every class uses them regardless of their approach to application. In essence, then, this interface lays the groundwork for the implementation of the collecting classes.
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Conclusion
Built on the fundamental Collection and Map interfaces, the Java Collections Framework presents a strong and flexible framework for grouping items. Along with concrete classes, which let developers effectively store, retrieve, manage, and arrange data in many ways to fit different application demands, it offers a rich collection of interfaces like collection, List, Queue, Deque, and their sorted equivalents. Good Java programming depends on an awareness of this foundation.
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