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A readable source of bytes.Most clients will use input streams that read data
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Uses a one-way hash function to turn an arbitrary number of bytes into a
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A linear collection that supports element insertion and removal at both ends.
The name deque is shor
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A Set is a data structure which does not allow duplicate elements.
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A task that returns a result and may throw an exception. Implementors define a
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This is the central class in the log4j package. Most logging operations, except
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