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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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Wraps an existing Writer and buffers the output. Expensive interaction with the
underlying reader is
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A connection to a URL for reading or writing. For HTTP connections, see
HttpURLConnection for docume
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KeyStore is responsible for maintaining cryptographic keys and their owners.
The type of the syste
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Collection is the root of the collection hierarchy. It defines operations on
data collections and t
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A Map is a data structure consisting of a set of keys and values in which each
key is mapped to a si
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