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Return the contained value, if present, otherwise throw an exception to be
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Allows reading from and writing to a file in a random-access manner. This is
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ArrayList is an implementation of List, backed by an array. All optional
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Timers schedule one-shot or recurring TimerTask for execution. Prefer
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The TimerTask class represents a task to run at a specified time. The task may
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A TimeUnit represents time durations at a given unit of granularity and provides
utility methods to
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