Java Concurrency APIs Explained: A Practical Map for Developers

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Java offers a wide range of concurrency APIs — including Thread, ExecutorService, Future, CompletableFuture, locks, atomics, and synchronizers — each designed to answer a specific question about parallel work. These APIs can be grouped by responsibility: defining tasks, choosing where they run, obtaining results, protecting shared state, sharing data safely, and coordinating execution. A practical example of building a customer dashboard illustrates how submitting independent tasks before blocking on their results enables true parallel execution. Java 21 introduced virtual threads as a final feature, allowing developers to create one lightweight thread per task without the overhead of platform threads. Understanding the distinction between tasks and threads is key — Runnable and Callable describe work, while Thread and Executor determine how and where that work runs.

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