![]() List InterfaceList is an ordered collection sometimes called a sequence which can hold duplicate elements in it. It never contains duplicate elements and models the mathematical set abstraction to represent the sets such as processes running on a machine. Set InterfaceSet is used to hold unique elements in it. Implementing the basic collection operations, it also provides additional insertion and extraction methods. Queue InterfaceQueue is used to hold the elements but they can not be processed. It returns an iterator for the specific collection to iterate over it. Iterable InterfaceIt is the root interface for the Collections framework as it is extended by the Collection interface which is implemented by all classes. This interface has methods for knowing the size of the collection, and whether an object exists in the collection, adding or removing objects from the collection. The Map is the only data structure that does not implement it but the remaining all implement its methods. Here is a list of some of the collections:Ĭollection InterfacesHere we will discuss some common collection interfaces and then some methods implemented by the classes.Ĭollection InterfaceThis is a basic foundation for the Collections framework as it provides all the necessary methods for implementation. Types Of CollectionsJava collections framework has a lot of types of collections in it to reduce our efforts. LinkedList also implements the Deque interface, for example. It is not mandatory that a class implements just one interface.PriorityQueue, HashSet, LinkedList, and Stack all are classes or the implementation of these interfaces.Set, Queue and List are extended by the Collection interface. Collection, Set, Queue, and List all are interfaces.Hierarchy of Collection Framework For your understanding: What’s the Hierarchy of Collection Framework?Now let's see the collections hierarchy but first, we need to know the essential components of this framework. Reduces effort to learn and use new APIs.Performance Efficiency (speed and quality).If you want to import a specific collection then use the exact package name, such as:īenefits of Collections Framework in JavaIt has the following benefits. Implementation: You can import all of the collections by using the following line: The Collections framework provides us with a Queue interface which we only need to import rather than implement, then use it, and we are done. Now we need to implement this data structure and then use it to achieve our goal. This is also known as a FIFO (first in first out) implementation. So Collections framework in Java provides different data structures already implemented for storing data and methods, to manipulate them with features such as sorting, searching, deletion, and insertion.įor example, you want to implement a system for some random company to improve service for their customers, based on the first come first serve basis. What is the Collections Framework in Java?All objects are grouped into a single object along with an architecture that represents and provides different methods for manipulating collections. ![]() ![]() What is a Framework?A framework is a basic foundation or layout on which you start working by using the different classes and interfaces provided.įor example, Laravel is one of the most famous PHP frameworks that provides a basic skeleton for your application. What is Collection in Java?A collection in java is represented as a container that groups all the elements into a single unit.įor example, a mail folder (group of emails), a telephone directory (mapping of names to phone numbers).
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