Ascending order priority queue: In ascending order priority queue, a lower priority number is given as a higher priority in a priority.add(5): It will insert 5 element after 4 as 5 is larger than 4 and lesser than 8, so it will obtain the third highest priority in a priority queue. poll(): It will remove '2' element from the priority queue as it has the highest priority queue.As 2 is the smallest element among all the numbers so it will obtain the highest priority. add(2): This function will insert '2' element in a priority queue.In the above priority queue, the '1' element has the highest priority, so it will be removed from the priority queue. poll(): This function will remove the highest priority element from the priority queue.Now, we will observe how the priority queue will look after performing the following operations: We have a priority queue that contains the following values:Īll the values are arranged in ascending order. Let's understand the priority queue through an example. If two elements in a priority queue have the same priority, they will be arranged using the FIFO principle.An element with the higher priority will be deleted before the deletion of the lesser priority.Every element in a priority queue has some priority associated with it.Characteristics of a Priority queueĪ priority queue is an extension of a queue that contains the following characteristics: Therefore, the 1 number would be having the highest priority while 22 will be having the lowest priority. The priority queue supports only comparable elements, which means that the elements are either arranged in an ascending or descending order.įor example, suppose we have some values like 1, 3, 4, 8, 14, 22 inserted in a priority queue with an ordering imposed on the values is from least to the greatest. The priority of the elements in a priority queue will determine the order in which elements are removed from the priority queue. Let's see the declaration for class.A priority queue is an abstract data type that behaves similarly to the normal queue except that each element has some priority, i.e., the element with the highest priority would come first in a priority queue. However, sometimes the elements of the queue are needed to be processed according to the priority, that's where a PriorityQueue comes into action. It is already described that the insertion and deletion of objects follows FIFO pattern in the Java queue. PriorityQueue is also class that is defined in the collection framework that gives us a way for processing the objects on the basis of priority. In fact, deques support element insertion and removal at both ends. All Queues barring the Deques facilitates removal and insertion at the head and tail of the queue respectively.Those Queues that are present in the ncurrent package are known as bounded Queues.
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