Web Reference: 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. It is always at least as large as the queue size. As elements are added to a priority queue, its capacity grows automatically. The details of the growth policy are not specified. This class and its iterator implement all of the optional methods of the Collection and Iterator interfaces. In this short tutorial, we’ll talk about the Java implementation of the Priority Queue. First, we‘ll see the standard usage and present some examples by ordering the queue in natural and inverse order. Finally, we’ll see how it’s possible to define a custom order using Java Comparators.
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