What are the core implementation classes of Set interface defined in Java collections framework? FAQ Or, if a comparator is provided, then sorting is done according to the comparator on the keys. The sorting is done according to the natural order of the keys. SortedMap - extends from Map interface, and maintains its elements in ascending order. Unlike other core collection interfaces, Map does not extend from the Collection interface.Ĩ. A map cannot contain duplicate keys, and each key can map only to one value. Map - represents a collection object that maps keys to values. In dequeues elements can be inserted, retrieved and removed from both ends of the queue.Ħ. Dequeue - represent collections that can be either in a FIFO manner or in a LIFO manner. In a FIFO queue, new elements are inserted to the tail of the queue and elements are removed from the head of the queue.ĥ. an element which is first put into the queue will be the first to be removed when a call to remove or poll is made. Queue - represents a collection that is typically ordered in a FIFO (first-in first-out) manner. Elements in a list can be accessed, inserted or deleted by their index position.Ĥ. Lists are ordered based on their index position. List - represents an ordered collection of elements. If a comparator is provided, then sorting is done according to the comparator.ģ. The sorting is done according to the natural order of the elements. SortedSet - extends from Set interface, and maintains its elements in ascending order. Set - represents a collection of unique elements. All other core collection interfaces in the Java collections framework, except for maps, extend from the interface either directly or indirectly.Ģ. Collection - interface is the root of the Java collections framework hierarchy. Java collections framework includes the following key interfaces.ġ. What are the key interfaces defined in Java collections framework? FAQ Review them, make them a part of your Java collections vocabulary, and talk about them confidently during your interview process. Important keywords are provided at the end of the questions. In most Java coding interview questions, you will end up using one or more of the Java collections for your solution.īelow Java collections interview questions, answers, tips and samples will get you grounded on the fundamentals helps you to memorize some important methods, and review the basic operations that you will frequently perform on collections such as sorting, insertion and deletion. Knowledge in inner workings of different Java collections is critical for coding and algorithmic interviews. The interview can be for any level - beginner or senior and for any role - Software engineer, Software programmer, Software architect or for Software management roles. Your knowledge of the different Java collections provided by Java programming API, the difference between the different collections, when to use which collection and the efficiency of the collections - will be tested, either directly or indirectly, in most Java programming interviews. Java collections interview questions are very frequently asked both in telephonic screening interviews as well as in face-to-face interviews. Java programming language provides numerous kinds of data structures and packages them within the Collections API. (It takes roughly zero imagination to think of one.)īut I don't know how you would (objectively) distinguish between an ordinary use-case and a "specially useful" one. Indeed, any program where you need to use an immutable list with one element is a valid use-case. It is part of the specification of the method see above.Īre there any special useful use-cases for this method, rather than just being a convenience method?Ĭlearly, there are use-cases where it is convenient to use the singletonList method. (An application that creates vast numbers of singleton lists is unusual to say the least.) It may also be a bit faster and/or save a bit of memory, but it is unlikely that these small savings will be significant. to save you having to write a sequence of statements to: Why would I want to have a separate method to do that? "Returns an immutable list containing only the specified object.
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