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Provides access to system-related information and resources including standard
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A ConnectException is thrown if a connection cannot be established to a remote
host on a specific po
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A Uniform Resource Identifier that identifies an abstract or physical resource,
as specified by RFC
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A connection to a URL for reading or writing. For HTTP connections, see
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
#acquire blocks if
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