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Return the contained value, if present, otherwise throw an exception to be
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ArrayList is an implementation of List, backed by an array. All optional
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A java.util.Queue that additionally supports operations that wait for the queue
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
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An ExecutorService that executes each submitted task using one of possibly
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The Manifest class is used to obtain attribute information for a JarFile and its
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