Web Reference: Mar 24, 2026 · The Queue interface is part of the java.util package and extends the Collection interface. It represents a data structure where elements are processed based on a specific order. Besides basic Collection operations, queues provide additional insertion, extraction, and inspection operations. Each of these methods exists in two forms: one throws an exception if the operation fails, the other returns a special value (either null or false, depending on the operation). In this tutorial, we’ll be discussing Java’s Queueinterface. First, we’ll take a peek at what a Queue does, and some of its core methods. Next, we’ll dive into a number of implementations that Java provides as standard. Finally, we’ll talk about thread safety before wrapping it all up.
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