All Concurrent Utility Classes and their uses.

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Concurrent Utility Classes provide support for concurrent programming in Java.

ConcurrentHashMap: Thread-safe implementation of Map interface.
CopyOnWriteArrayList: Thread-safe implementation of List interface.
CountDownLatch: Synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.
Semaphore: Controls the number of threads that can access a shared resource concurrently.
ExecutorService: Interface that provides a way to manage and control the execution of asynchronous tasks.
BlockingQueue: Interface that represents a queue that supports operations that wait for the queue to become non-empty when retrieving an element.
CyclicBarrier: Synchronization aid that allows a set of threads to wait for each other to reach a common barrier point.
ForkJoinPool: Implementation of ExecutorService that helps in parallelizing recursive tasks.
CompletableFuture: Represents a future result of an asynchronous computation.
ScheduledExecutorService: Extension of ExecutorService that supports scheduling of tasks to run after a certain delay or at regular intervals.

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