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An Internet Protocol (IP) address. This can be either an IPv4 address or an IPv6
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A Uniform Resource Locator that identifies the location of an Internet resource
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Collection is the root of the collection hierarchy. It defines operations on
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A Properties object is a Hashtable where the keys and values must be Strings.
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TreeSet is an implementation of SortedSet. All optional operations (adding and
removing) are support
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Is the value null?
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