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Returns the number of elements in this queue. Removes all of the elements from this queue. Inserts the specified element in the queue. It creates a priority queue that has a default capacity of 11.

Here are the following constructors in the Java priority queue: PriorityQueue() For methods like add and poll, O(log(n)) time is needed.However, the PriorityBlockingQueue class can be used for thread-safe implementation of priority queue as it provides thread-safety and blocking operations for concurrent access.The PriorityQueue class in Java is not thread-safe by default.The least element with respect to ordering is known as the head of the queue.Priority Queue is an unbound queue in Java as it has no fixed capacity, meaning it can grow dynamically as new elements are added to it.A priority queue can’t be created for objects that are non-comparable based on any logic.Here are a few important points on priority queue: The class implements interfaces such as Serializable, Iterable, Collection, Queue. Where E is the type of elements held in this queue. In either case, the ordering of the elements represents their relative priority. This indicates that the elements within the priority queue are arranged based on a comparator, which can be as basic as a regular number comparator.īelow is the hierarchy order of Priority Queue in Java.Ī priority queue’s elements are ordered either by natural ordering (in which case the elements that are sorted first will be accessed first) or according to a comparator. The priority queue utilizes a heap data structure to organize its elements. It allows accessing the highest-priority element in the queue efficiently. Java priority queue is a data structure that stores elements in a specific order based on their priority. The time complexity of inserting an element into a Priority Queue is O(log n), while removing an element takes O(1) time. This data structure allows for efficient insertion and removal of elements while maintaining the priority order. Priority Queues in Java are implemented using a heap data structure. The element with the highest priority is always at the front of the queue and is the first to be dequeued. It is a special type of queue where each element is associated with a priority and is sorted based on its priority. Java Priority Queue is a class that implements the Queue interface in Java.