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A connection to a URL for reading or writing. For HTTP connections, see
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This class generates cryptographically secure pseudo-random numbers. It is best
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HashSet is an implementation of a Set. All optional operations (adding and
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TimeZone represents a time zone offset, and also figures out daylight savings.
Typically, you get a
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An ExecutorService that executes each submitted task using one of possibly
several pooled threads, n
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