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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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A specialized Writer that writes to a file in the file system. All write
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Represents a command that can be executed. Often used to run code in a different
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Provides access to system-related information and resources including standard
input and output. Ena
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A connection to a URL for reading or writing. For HTTP connections, see
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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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A filter is an object that performs filtering tasks on either the request to a
resource (a servlet o
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