Please note that the Java implementation of the priority queue uses different names for the methods. peek - Returning the front element of the queue, without removing it.contains - Returning true if the queue contains the given element.size - Returning the size/number of elements in the queue.
isEmpty - Returning true if the queue is empty.dequeue - Removing an element from the queue.enqueue - Inserting an element into the queue.The most basic set of operations for any implementation of a queue is: To keep our example implementation compliant with the Java specification, the least element is defined as the element with the highest priority. If you were to implement a priority queue in real life, you probably want to make use of generics - or just do like any other developer and use the built-in. However, keep in mind that this is for demonstration purposes only. In our example, the priority queue will be limited to int, so natural ordering is perfectly fine. So for simplicity's sake, we'll order the elements based on their natural ordering.
PRIORITY QUEUE JAVA EXAMPLE HOW TO
In this article, we'll focus on how to implement a priority queue. Order elements with a custom Comparator.Order elements based on their natural ordering.
In a priority queue, the elements are being removed from the queue based on their priority. This translates to the requirement that: Every element in a priority queue must have a priority associated with it.Īs you might have guessed, the element with the highest priority is removed from the queue (dequeued).īut how do should you define the priority of the elements in the queue? Defining Priorities to Elementsīasically, you have two alternatives for defining priorities to the elements in the queue.
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