Web Reference: An unbounded priority queue based on a priority heap. 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. A priority queue does not permit null elements. Mar 25, 2026 · A PriorityQueue in Java is a queue where elements are ordered based on their priority, rather than the order of insertion. By default, it uses natural ordering (min-heap), but a custom comparator can be used to define different priorities. The below program demonstrates a simple PriorityQueue in Java. We create an object of PriorityQueue class, add values to it, and then display the contents of the Queue using Iterator. Output:
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