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Java queue5/28/2023 ![]() ![]() ![]() This function returns the element which was just replaced by a new element. This method replaces elements at a given index with the new element. This method returns elements at the specified index. This method is used to remove and return the first occurrence of the given element in the queue. It shifts subsequent elements(if any) to left and decreases their indexes by 1. This method removes an element from the specified index. This method is used to remove the element from the front of the queue. However, the reference of the queue created is still stored. This method is used to remove all the elements in the queue. This method is used to return the size of the queue. When a single parameter is passed, it adds all the elements of the given collection at the end of the queue. This method is used to add all the elements in the given collection to the queue. When a single parameter is passed, it simply adds the element at the end of the queue. This method is used to add an element at a particular index in the queue. The queue interface inherits all the methods present in the collections interface while implementing the following methods: ![]() Let’s see how to create a queue object using this class. It is known that a queue follows the First-In-First-Out algorithm, but sometimes the elements of the queue are needed to be processed according to the priority, that’s when the PriorityQueue comes into play. PriorityQueue: PriorityQueue class which is implemented in the collection framework provides us a way to process the objects based on the priority. The Deques support element insertion and removal at both ends.Ĭlasses that implement the Queue Interface:ġ. All Queues except the Deques supports insertion and removal at the tail and head of the queue respectively.The Queues which are available in package are the Bounded Queues.The Queues which are available in java.util package are Unbounded Queues.If any null operation is performed on BlockingQueues, NullPointerException is thrown.LinkedList, ArrayBlockingQueue and PriorityQueue are the most frequently used implementations.The Java Queue supports all methods of Collection interface including insertion, deletion, etc.The Queue is used to insert elements at the end of the queue and removes from the beginning of the queue. ![]()
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