Web Reference: Learn how to use the PriorityQueue class, an unbounded priority queue based on a priority heap, in Java. See the constructors, methods, and examples of this class. 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. 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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