![]() ![]() ![]() Getting objects from the queue using toArray() Check if an element is present using contains() printing the modified pQueue using poll() Removing the top priority element (or head) and ("Head value using peek function:"+ pQueue.peek()) Adding items to the pQueue using add() PriorityQueue pQueue = new PriorityQueue() PriorityQueue(SortedSet p): Creates a PriorityQueue having the elements in the given sorted set.Ĭreating a Priority Queue with Basic Operations //Program to demonstrate working of priority queue in Java.PriorityQueue(PriorityQueue p): Creates a PriorityQueue having the elements in the given priority queue.PriorityQueue(int initialCapacity, Comparator comparator): Creates a PriorityQueue with the specified initial capacity that orders its elements as per the given comparator.PriorityQueue(int initialCapacity): Creates a PriorityQueue with the specified initial capacity.PriorityQueue(Collection p): Creates a PriorityQueue having the elements in the specified collection.PriorityQueue(): Creates a PriorityQueue with the default initial capacity of 11.The operations like poll, remove, peek will be at the element at the head of the queue.PriorityQueue are unbound queues of elements.We can not create PriorityQueue of Objects which are not comparable.PriorityQueue doesn’t store NULL pointers.Some of the important points on Priority Queue are PriorityQueue implements the Queue interface and it part of the collection framework. Hence, when you remove an element from the priority queue the least element as per the specified ordering is removed first. Elements of the priority queue are orderedĪs per the natural ordering or we can provide a Comparator during queue creation time.įront side of the priority queue has the least element as per the specified ordering and the rear of the priority queue has the largest element. ![]() That is where the PriorityQueue comes into picture.The PriorityQueue underlying uses priority heap. But at times the elements of the queue are required to be processed as per their priority, As we all know that a Queue works on the basis Priority Queue having User defined objectsĪ PriorityQueue is usually needed when the elements are processed as per their priority.Creating a Priority Queue with a custom Comparator.Creating a Priority Queue with Basic Operations. ![]()
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