![]() They didn't have a common interface and interconnection with each other. They had one major disadvantage, and that was lesser similarities. But prior to the release, Vectors, Stacks and Arrays were there. Collections in Java were not a part of the original Java release. Now you might be wondering what is its need. All collections framework contain interfaces, classes and algorithms. It provides a ready-made architecture for interfaces and classes and used for storing and manipulating a group of objects. It was defined in JDK 1.2 version which is one of the most used frameworks till date. The java.util package contains the powerful tool of Collections Framework. In Java, the Collections Framework is a hierarchy of interfaces and classes that provides an easy management of a group of objects. The Collections Framework is defined as a unified architecture for representing and manipulating collections. Queue is same as the real-life queues, the one who enters the queue first, it leaves it first too.Stacks are like a stack of plates or trays in which the top-most one gets picked first.Linked list emulates your browsing history, train coaches which are connected to each other etc.Let us try to understand the real-life use cases: Now that we know what Collection in Java is, They are used to standardize the way in which objects are handled in the class. Technically, a collection is an object or a container that stores a group of other objects.Ī Collection in Java is an object which represents a group of objects, known as its elements. This piggy bank is called as Collection and the coins are nothing but objects. We all had it during our childhood where we used to store our coins. The various classes and interfaces of the Collections Framework will be covered here in depth, good enough to get you started.Ĭonsider the example of a piggy bank.In this article, we will learn about the Collections Framework in Java. ![]() Java Collection framework provides many interfaces ( List, Queue, Deque, Set) and classes ( ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet). It is a hierarchy of interfaces and classes that provides an easy management of a group of objects. Collections in Java is a framework that stores and manipulates a group of objects.
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