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Return the contained value, if present, otherwise throw an exception to be
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A readable source of bytes.Most clients will use input streams that read data
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A writable sink for bytes.Most clients will use output streams that write data
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KeyStore is responsible for maintaining cryptographic keys and their owners.
The type of the syste
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A concrete subclass of NumberFormat that formats decimal numbers. It has a
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Calendar is an abstract base class for converting between a Date object and a
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