Top Java Collections Interview Questions (2022) – InterviewBit

The collection model has several interfaces, each of which is used to store a different sort of data. The interfaces included in the framework are listed below. 1. Iterable Interface : This is the collection framework ‘s basal interface. The iterable interface is extended by the collection interface. As a consequence, all interfaces and classes implement this interface by default. This interface ‘s independent determination is to provide an iterator for the collections. As a result, this interface only has one abstract method acting, the iterator. 2. Collection Interface : The solicitation model ‘s classes implement this interface, which extends the iterable interface. This interface covers all of the basic methods that every collection has, such as adding data to the collection, removing data from the solicitation, clearing data, and therefore on. All of these methods are incorporated in this interface because they are used by all classes, careless of their implementation style. furthermore, including these methods in this interface guarantees that the method acting names are consistent across all collections. In compendious, we may conclude that this interface lays the foundation for the execution of solicitation classes. 3. List Interface : The collection interface has a child interface called the list interface. This interface is devoted to list data, in which we can store all of the objects in an arrange collection. This besides allows for the presence of pleonastic data. diverse classes, such as ArrayList, Vector, Stack, and others, implement this list interface. We can create a list object with any of these classes because they all implement the list.

4. Queue Interface : A queue interface, as the name implies, follows the FIFO ( First In First Out ) ordering of a real-world queue line. This interface is for storing all elements in which the regulate of the elements is significant. When we try to shop at a store, for case, the bills are issued on a first-come, first-served basis. As a resultant role, the individual whose request is first in agate line receives the bill first. PriorityQueue, Deque, ArrayDeque, and other classes are available. Because all of these subclasses implement the queue, we can use any of them to create a line up object.

5. Deque Interface : It differs slenderly from the line up data structure. Deque, besides known as a double-ended line up, is a data structure in which elements can be added and removed from both ends. The queue interface is extended by this interface. ArrayDeque is the class that implements this interface. Because this class implements the deque, we can use it to create a deque object. 6. Set Interface : A jell is an ungraded group of objects in which extra values can not be kept. This collection is utilized when we want to avoid duplicate of things and merely keep the ones that are unique. versatile classes, such as HashSet, TreeSet, LinkedHashSet, and others, enforce this set interface. We can create a set object with any of these classes because they all implement the set. 7. Sorted Set Interface : This interface resembles the hardening interface in appearance. The only difference is that this interface provides extra methods for maintaining element rate. The sorted set interface is an extension of the bent interface that is used to manage sorted data. TreeSet is the class that implements this interface. We can create a SortedSet object using this class because it implements the SortedSet interface .

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