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Aug 19, 2022 · The Collections Framework is a sophisticated hierarchy of interfaces and classes that provide state-of-the-art technology for managing groups of objects. You can perform following activity using Java collection framework, Add objects to collection. Remove objects from collection. Search for an object in collection.
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- Util
- What Is A Framework in Java?
- Hierarchy of The Collection Framework in Java
- Methods of The Collection Interface
- Interfaces That Extend The Java Collections Interface
A framework is a set of classes and interfaces which provide a ready-made architecture. In order to implement a new feature or a class, there is no need to define a framework. However, an optimal object-oriented design always includes a framework with a collection of classes such that all the classes perform the same kind of task.
The utility package, (java.util) contains all the classes and interfaces that are required by the collection framework. The collection framework contains an interface named an iterable interface which provides the iterator to iterate through all the collections. This interface is extended by the main collection interface which acts as a root for th...
This interface contains various methods which can be directly used by all the collections which implement this interface. They are:
The collection framework contains multiple interfaces where every interface is used to store a specific type of data. The following are the interfaces present in the framework.
- 9 min
- Iterable Interface. The Iterable interface is the root interface for all the collection classes. The Collection interface extends the Iterable interface and therefore all the subclasses of Collection interface also implement the Iterable interface.
- Collection Interface. The Collection interface is the interface which is implemented by all the classes in the collection framework. It declares the methods that every collection will have.
- List Interface. List interface is the child interface of Collection interface. It inhibits a list type data structure in which we can store the ordered collection of objects.
- ArrayList. The ArrayList class implements the List interface. It uses a dynamic array to store the duplicate element of different data types. The ArrayList class maintains the insertion order and is non-synchronized.
A collection framework is a unified architecture or a set of classes and interfaces for representing and manipulating collections. i.e. collection framework is used to store, retrieve and manipulate collections.
- Interfaces of Collections FrameWork. The Java collections framework provides various interfaces. These interfaces include several methods to perform different operations on collections.
- Java Collection Interface. The Collection interface is the root interface of the collections framework hierarchy. Java does not provide direct implementations of the Collection interface but provides implementations of its subinterfaces like List, Set, and Queue.
- Subinterfaces of the Collection Interface. As mentioned earlier, the Collection interface includes subinterfaces that are implemented by Java classes. All the methods of the Collection interface are also present in its subinterfaces.
- Java Map Interface. In Java, the Map interface allows elements to be stored in key/value pairs. Keys are unique names that can be used to access a particular element in a map.
The LinkedList class is a collection which can contain many objects of the same type, just like the ArrayList. The LinkedList class has all of the same methods as the ArrayList class because they both implement the List interface. This means that you can add items, change items, remove items and clear the list in the same way.
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What is Java Collections Framework?
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A collections framework is a unified architecture for representing and manipulating collections, enabling collections to be manipulated independently of implementation details. The primary advantages of a collections framework are that it:
