![]() PriorityQueue(int initialCapacity) - empty queue with the specified initial capacity that orders its elements according to their natural ordering.PriorityQueue(Collection c) - empty queue containing the elements in the specified collection.PriorityQueue() - empty queue with the default initial capacity (11) that orders its elements according to their natural ordering.PriorityQueue class constructors and declarationPriorityQueue class provides 6 different ways to construct a priority queue in Java. Now let’s dwell on its external attributes. We consider the internal structure of the priority queue using an example a bit later. To understand how the priority queue actually works and what it gives, you need to figure out how the heap works. That is, if, say, we use a queue whose elements are natural numbers, then the first element will be the smallest, and the last - the largest. Pretty often after reading this definition rookie students begin to think that priority queue is sorted in a linear sense. That means, in case of numbers queue elements, the first element of the queue will be the minimal of these numbers. A priority queue based on a priority min heap. ![]() How is priority determined? According to the documentation, the elements of the priority queue are ordered according to their natural ordering, or by a Comparator provided at queue construction time, depending on which constructor is used. If you delete (serve) the highest ranked element, the second one goes to the head to get its coffee. The element with highest priority will be moved to the head of the queue. The order of Java priority queue elements depends on the priority of the elements. What is a Priority Queue What is a Priority Queue? First of all it is a class that implements the Queue interface in case of inserting an element from the back and removing an element from the head. Public interface Queue extends Collection You want to get coffee from McDrive? If your car is the first near the window, you’ll get your coffee before the driver who is next. That reminds a regular queue in its common meaning. What does a programmer know of regular Queue Interface? First of all, this interface is based on the FIFO principle or “first in first out”. In this article we learn a priority queue, Java class, that implements Queue interface.
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