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Return the contained value, if present, otherwise throw an exception to be
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Wraps either an existing OutputStream or an existing Writerand provides
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Represents a command that can be executed. Often used to run code in a different
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Formats and parses dates in a locale-sensitive manner. Formatting turns a Date
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An ExecutorService that executes each submitted task using one of possibly
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A TimeUnit represents time durations at a given unit of granularity and provides
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